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Texture evolution and slip mode of a Ti-5.5Mo-7.2Al-4.5Zr-2.6Sn-2.1Cr dual-phase alloy during cold rolling based on multiscale crystal plasticity finite element model

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Journal of materials Science & technology 2022年第16期111卷 76-87页

作者： Duoduo Wang Qunbo Fan Xingwang Cheng Yu Zhou Ran Shi Yan Qian Le Wang Xinjie Zhu Haichao Gong Kai Chen Jingjiu Yuan Liu Yang National Key Laboratory of Science and technology on materials Under Shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing institute of technology Chongqing Innovation Center Chongqing 401135China Microstructure and Properties of materials(IEK-2) Forschungszentrum JülichJülichGermany chengdu advanced metal materials industrial technology research institute co.ltd Chengdu 610000China

The complex micromechanical response among grains remains a persistent challenge to understand the deformation mechanism of titanium alloys during cold ***,in this work,a multiscale crystal plasticity finite element method of dual-phase alloy was proposed and secondarily developed based on LS-DYNA ***,the texture evolution and slip mode of a Ti-5.5Mo-7.2Al-4.5Zr-2.6Sn-2.1Cr alloy,based on the realistic 3D microstructure,during cold rolling(20%thickness reduction)were systematically *** relative activity of the■slip system in theαphase gradually increased,and then served as the main slip mode at lower Schmid factor(contrast,the contribution of the■slip system to the overall plastic deformation was relatively *** theβphase,the relative activity of the{110}slip system showed an upward tendency,indicating the important role of the critical resolved shear stress relationship in the relative activity ***,the abnormally high strain of very fewβgrains was found,which was attributed to their severe rotations compelled by the neighboring pre-deformedα*** calculated pole figures,rotation axes,and compelled rotation behavior exhibited good agreement to the experimental results.

关键词： Titanium alloy Multiscale crystal plasticity finite element model Texture evolution Slip mode

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Role of radiative and convective heat transfer during heating of an ingot product in a tubular furnace:experiment and simulation

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Journal of Iron and Steel research International 2022年第12期29卷 1978-1985页

作者： Wen-chao Yang Yang Zhou Jian Zhang Huan Liu Ying-jie Ren Jia-jun Chen Xian-guang Zhang School of metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing 100083China chengdu advanced metal materials industrial Technolgy research institute co. Ltd.Chengdu 610300SichuanChina

convective heat transfer and radiative heat transfer are two essential heat transfer modes in the heating process of steel;it is important to understand the role of them during the heating process *** effects of the convective and radiative heat transfer during the heating process of a cast ingot in a tubular furnace have been studied by the designed natural and forced convection experiments and mathematical *** heating time for the center of the ingot to reach the furnace temperature is decreased with the increase in furnace *** to the experimental and simulation results,a model is proposed regarding the role of radiative and convective heat transfer in the heating *** low temperature,the convective heat transfer plays a dominant role,while at high temperature,the influence of radiative heat transfer is *** a critical temperature exists between *** forced convective heat transfer can enhance the influence of the convective heat *** critical temperature can be shifted to higher temperatures.

关键词： Reheating Tubular furnace Cast ingot convective heat transfer Radiative heat transfer

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Inclusions modification by rare earth in steel and the resulting properties: A review

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Journal of Rare Earths 2024年第3期42卷 431-445,I0001页

作者： Xiaoqiang Wang Zhiwei Wu Bing Li Wenxiong Chen Jun Zhang Jian Mao college of materials Science and Engineering Sichuan UniversityChengdu610065China chengdu advanced metal materials Industry technology research institute co. Ltd.Chengdu610303China State Key Laboratory of metal Material for Marine Equipment and Application Anshan114009China

Rare earth(RE) elements are excellent modifiers for non-metallic inclusions that inevitably appear in steel and affect steel properties. This paper reviews the research status of inclusions modification by RE elements and the changes it cause on steel properties. First, the inclusion changes caused by RE modification are described. Generally, after adding pure RE, the main evolution of inclusions occurs as M →M + RE-Al-O → RE-Al-O + RE_(2)O_(2)S → RE_(2)O_(2)S + RE—S/RE_(2)O_(2)S + RE-O with an increase in the RE content(M represents the inclusions before RE addition). The type of final inclusion obtained after RE modification is related to the relative contents of S and O in the steel. Moreover, fine, regular, and uniformly distributed inclusions can be obtained with appropriate RE addition. However, the effectiveness of inclusions modification by adding both RE and non-RE elements is closely related to the order of their addition. Second, the applications and advantages of thermodynamic calculations in the study of RE-modified inclusions are introduced. Third, the changes in the corrosion resistance, impact properties,and other properties of steel caused by the modification of inclusions by RE are reviewed. Finally, the perspectives and trends of inclusions modified by RE elements in the steel industry are presented.

关键词： Rare earths Inclusions Modification Thermodynamic calculation Properties change

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Deformation mechanism of fine structure and its quantitative relationship with quasi-static mechanical properties in near β-type Ti-4.5Mo-5.1Al-1.8Zr-1.1Sn-2.5Cr-2.9Zn alloy

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Progress in Natural Science:materials International 2021年第5期31卷 742-748页

作者： Xinjie Zhu Qunbo Fan Duoduo Wang Haichao Gong Yu Gao Hong Yu Xingwang Cheng Zhiming Zhou Liu Yang National Key Laboratory of Science and technology on materials Under Shock and Impact School of Materials Science and Engineering Beijing Institute of Technology Beijing institute of technology Chongqing Innovation Center School of materials Science and Engineering Chongqing University of Technology chengdu advanced metal materials industrial technology research institute co.ltd.

The deformation mechanism of the fine structure composed of primary α phase(αp) and acicular secondary αphase(αs) on quasi-static mechanical properties is still not very clear. The main controversy is focused on the role of αpin the mechanical behavior. In this paper, the microstructure of the heat-treated near β-type Ti-4.5 Mo-5.1 Al-1.8 Zr-1.1 Sn-2.5 Cr-2.9 Zn alloy after tensile tests was observed by transmission electron microscopy(TEM). And the results showed that in the slight deformation region the dislocations were accumulated at the intersection ofαpand β matrix separated by αs, while only a few dislocations nucleated in β matrix. In the severe deformation region, a large quantity of dislocations in both αpand β matrix were observed. It can be inferred that αpdeformed firstly and then activated the deformation of β matrix, that is, the thickness of αpand the inter-particle spacing ofαsplayed a dominant role in the deformation process. The quantitative relationship between the yield strength and the microstructure parameters is consistent with this inference. By adjusting the solution treatment parameters and the subsequent aging treatment, three fine structures were obtained, and the corresponding mechanical properties were determined. Furthermore, the yield strength can be described by the mathematical model σy= 756.4 + 135.6/hp1/2+32.2/ds1/2, where hpand dsare the thickness of αpand the inter-particle spacing of αs,respectively.

关键词： Deformation mechanism Fine structure Quantitative relationship Titanium alloy

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Effects of microstructure characteristics on the tensile properties and fracture toughness of TA15 alloy fabricated by hot isostatic pressing

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International Journal of Minerals,metallurgy and materials 2023年第4期30卷 697-706页

作者： Langping Zhu Yu Pan Yanjun Liu Zhiyu Sun Xiangning Wang Hai Nan Muhammad-Arif Mughal Dong Lu Xin Lu Beijing advanced Innovation Center for materials Genome Engineering Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijing 100083China AECC Beijing institute of Aeronautical materials Beijing 100095China Beijing Engineering research Center of advanced Titanium Alloy Precision Forming technology Beijing 100095China institute of Artificial Intelligence University of Science and Technology BeijingBeijing 100083China Sichuan advanced metal Material Additive Manufacturing Engineering technology research Center Chengdu Advanced Metal Materials Industry Technology Research Institute Co.LtdChengdu 610300China

Powder hot isostatic pressing(HIP) is an effective method to achieve near-net-shape manufacturing of high-quality complex thinwalled titanium alloy parts, and it has received extensive attention in recent years. However, there are few reports about the microstructure characteristics on the strengthening and toughening mechanisms of powder hot isostatic pressed(HIPed) titanium alloys. Therefore, TA15powder was prepared into alloy by HIP approach, which was used to explore the microstructure characteristics at different HIP temperatures and the corresponding tensile properties and fracture toughness. Results show that the fabricated alloy has a “basket-like structure” when the HIP temperature is below 950℃, consisting of lath clusters and surrounding small equiaxed grains belts. When the HIP temperature is higher than 950℃, the microstructure gradually transforms into the Widmanstatten structure, accompanied by a significant increase in grain size. The tensile strength and elongation are reduced from 948 MPa and 17.3% for the 910℃ specimen to 861 MPa and 10% for the 970℃ *** corresponding tensile fracture mode changes from transcrystalline plastic fracture to mixed fracture including intercrystalline *** fracture toughness of the specimens increases from 82.64 MPa·m^(1/2)for the 910℃ specimen to 140.18 MPa·m^(1/2)for the 970℃ *** below 950℃ tend to form holes due to the prior particle boundaries(PPBs), which is not conducive to toughening. Specimens above 950℃ have high fracture toughness due to the crack deflection, crack branching, and shear plastic deformation of the Widmanstatten structure. This study provides a valid reference for the development of powder HIPed titanium alloy.

关键词： powder titanium alloy hot isostatic pressing strength fracture toughness

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Effect of feeding parameters on ingot segregation and shrinkage pore in vacuum arc remelting

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Journal of Iron and Steel research International 2023年第6期30卷 1268-1278页

作者： Dong-bin Jiang Fu-zhong Yang Jian Zhang Yang Zhou Li-feng Zhang School of metallurgy and Ecological Engineering University of Science and Technology BeijingBeijing 100083China chengdu advanced metal materials industrial technology institute Chengdu 610303SichuanChina School of Mechanical and materials Engineering North China University of TechnologyBeijing 100144China

The feeding parameters in the final stage of vacuum arc remelting process obviously affect the solute segregation and shrinkage pore *** with the electromagnetic field,fluid flow,and solute transport,a numerical model was built to investigate the effect of feeding parameters on the ingot solidification *** Nb segregation and shrinkage pore depth in the solidified ingot were *** results show that the liquid moves along the solidification front and the vertex flow is formed in the liquid pool,which promotes solute *** the solidified ingot,the Nb segregation in the lower part is negative,while that in the upper part is *** the differential electrode applied,the positive segregation is slightly reduced but the segregation distribution remains *** the feeding current decreases,the positive segregation zone moves toward the ingot top surface,due to the final solidification position moving *** the feeding time extended,the positive segregation moves to the top surface and the shrinkage pore depth is *** the feeding time is set at 12 min,the shrinkage pore depth can be reduced to 21 mm.

关键词： Vacuum arc remelting Feeding parameter Macrosegregation Shrinkage pore Solidification

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Oxidation and internal nitridation behaviors of a Ni-based superalloy Rene 65 during high-temperature homogenization

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Journal of Iron and Steel research International 2023年第8期30卷 1622-1632页

作者： Xian-guang Zhang Jia-jun Chen Yang Zhou Lang Shui Dong-ping Xiao Jian-hui Fu Wen-chao Yang Huan Liu Ying-jie Ren Peng Shi Jian Zhang State Key Laboratory of advanced metallurgy University of Science and Technology Beijing(USTB)Beijing 100083China School of metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing 100083China chengdu advanced metal materials industrial technology institute co. Ltd.Chengdu 610300SichuanChina Iron and State Key Laboratory of metal Material for Marine Equipment and Application Anshan 114009LiaoningChina Pangang Group research institute co. Ltd.Panzhihua 617000SichuanChina

Homogenization heat treatment is a key process to remove the micro-segregation and re-dissolve the undesired phases for wrought *** oxidation behavior of the wrought superalloy during the high-temperature homogenization process,however,was rarely *** oxidation film evolution and growth kinetics of an as-cast superalloy Rene 65 during the homogenization were systematically *** oxide film consists of Cr_(2)O_(3) external oxidation layer and dendritic TiO_(2) and Al_(2)O_(3) internal oxidation *** the growth kinetics of the oxide film followed a parabolic *** nitridation occurs during the oxidation process,and TiN is apparently formed at the tip of internal oxidation *** originally formed TiN can be transformed into TiO_(2) or retained with the progress of ***,the TiN is newly formed in the deeper matrix at the new oxidation-layer *** analyses revealed that there is a competition between the oxidation and *** can occur when the partial pressure of nitrogen exceeds the threshold of nitridation and the critical partial pressure ratio of nitrogen and oxygen.

关键词： Nickel-based superalloy Homogenization Oxidation Kinetics Internal nitridation Thermodynamics

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Preparation and water sorption properties of novel SiO_(2)-LiBr microcapsules for water-retaining pavement

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Chinese Journal of Chemical Engineering 2021年第6期34卷 230-241页

作者： Wenjing Li Gilmore Wellio Tiejun Lu Changjun Zou Yongliang Li School of Chemical Engineering University of BirminghamEdgbastonBirmingham B152TTUK college of Chemistry and Chemical Engineering Southwest Petroleum UniversityChengdu 610500China chengdu advanced metal materials Industry technology research institute co. LtdChengdu 610000China

Novel SiO_(2)-LiBr microcapsules for water-retaining pavement were prepared and firstly characterized by scanning electron microscope(SEM),particle size analysis,and Fourier transform infrared spectroscopy(FT-IR).The water vapor sorption and desorption of the formulated microcapsules was then experimentally studied using dynamic vapor sorption(DVS),with the results fitted to three kinds of adsorption kinetics *** addition,the specific surface area(SSA)was also calculated based on BET theory;and the thermal performance was investigated by laser flash analysis(LFA).Experimental results show a change of 103%in mass of the microcapsule sample under 90%relative humidity(RH)at 30℃after water vapor *** fitting of results indicates that the adsorption process is mainly governed by the intra-particle diffusion mechanism,followed by the pseudo-first-order adsorption *** comparison with most conventional pavement materials,it is found that the SSA of the formulated microcapsules is much larger while the thermal conductivity is *** unique properties of the formulated SiO_(2)-LiBr microcapsules have significant potential to take the edge off the urban heat island effect and reduce rutting when applied to water-retaining pavement materials.

关键词： Microcapsules Water vapor sorption Thermal performance Adsorption kinetics Water-retaining pavement

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Manipulating Zr/Ti ratio based on phase diagram for large electrocaloric effects with multiple target operation temperatures in PLZT ceramics

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Journal of advanced Ceramics 2024年第9期13卷 1422-1431页

作者： Junjie Li Ruowei Yin Zhe Xiong Yizheng Bao Xing Zhang Wenjuan Wu Lezhong Li Yang Bai Sichuan Province Key Laboratory of Information materials and Devices Application College of Optoelectronic Engineeringand Chengdu IC Valley Industrial CollegeChengdu University of Information TechnologyChengdu 610225China Beijing advanced Innovation Center for materials Genome Engineering and Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China chengdu Hongming Electronics co. Ltd.Chengdu 610199China Key Laboratory of Inorganic Functional materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201800China Sichuan Meteorological Optoelectronic Sensor technology and Application Engineering research Center Chengdu University of Information TechnologyChengdu 610225China

Ferroelectric phase transition has been identified as a promising avenue for designing high-performanceelectrocaloric materials for zero-emission and solid-state refrigeration. However, extensive research has been limited todeveloping ferroelectric materials with large electrocaloric effects near room temperature, preventing them from meetingdiverse refrigeration requirements. In this study, by leveraging the room-temperature phase diagram of the (PbLa)(ZrTi)O_(3)solution, we prepared a series of Pb_(0.775)La_(0.15)Zr_(x)Ti_(1−x)O_(3) bulk ceramics spanning the ferroelectric and relaxor ferroelectricphase regions. This enabled the attainment of various phase transition features and temperatures. Finally, largeelectrocaloric effects, coupled with adjustable operation temperatures ranging from 150 to −45℃, are successfullyachieved through manipulation of the Zr/Ti ratio. This comprehensive range of operation temperatures effectively addressesdiverse refrigeration application requirements, ranging from industrial equipment to freezer cabinets. This work not onlyunderscores the expansion of the electrocaloric refrigeration application domain but also proposes a material designstrategy tailored to meet these evolving demands.

关键词： electrocaloric effect phase transition phase diagram ferroelectric ceramics

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Brazing temperature-dependent interfacial reaction layer features between CBN and Cu-Sn-Ti active filler metal

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Journal of materials Science & technology 2019年第10期35卷 2163-2168页

作者： Yonggang Fan Junxiang Fan cong Wang School of metallurgy Northeastern UniversityShenyang110819China Shenyang NEU New industrial technology research institute co.ltd Northeastern UniversityShenyang110819China

CBN/Cu-Sn-Ti(CBN: cubic boron nitride) composites are prepared by active brazing sintering at 1123 K,1173 K, 1223 K and 1273 K, respectively. The effects of brazing temperature on the wettability, interfacial characteristics, and elemental distribution variations are fully investigated. When the brazing temperature is below 1223 K, completely uncoated and/or partially coated CBN particles with sharp edges can still be observed, and the reaction layer, mainly composed of Ti N and Ti B2, appears to be thin and *** the brazing temperature is 1223 K, all CBN particles are completely coated, suggesting that adequate wetting has taken place. Besides, as Ti diffuses thoroughly and enriches the interface, the reaction layer, filled primarily by Ti N, Ti B2 and Ti B, becomes thicker(about 1.30 μm), more uniform, stable and continuous. Further increasing the temperature to 1273 K is unnecessary or even harmful as the reaction layer thickness undergoes negligible change yet some tiny micro-cracks appear on the interface, which may likely deteriorate the grinding capability of the final brazing products.

关键词： Brazing temperature CBN/Cu-Sn-Ti filler metal Wettability Reaction layer

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