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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 Eco.ogical Engineering University of Science and Technology Beijing(USTB)Beijing 100083China chengdu advanced metal materials industrial Technolgy Research institute co. Ltd.Chengdu 610300SichuanChina

co.vective 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 co.vective 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 co.vection 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 co.vective heat transfer in the heating *** low temperature,the co.vective heat transfer plays a dominant role,while at high temperature,the influence of radiative heat transfer is *** a critical temperature exists between *** forced co.vective heat transfer can enhance the influence of the co.vective heat *** critical temperature can be shifted to higher temperatures.

关键词： Reheating Tubular furnace Cast ingot co.vective heat transfer Radiative heat transfer

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 co.lege 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 co.tent(M represents the inclusions before RE addition). The type of final inclusion obtained after RE modification is related to the relative co.tents 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. Seco.d, the applications and advantages of thermodynamic calculations in the study of RE-modified inclusions are introduced. Third, the changes in the co.rosion 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

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 Eco.ogical 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

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 co.posed of primary α phase(αp) and acicular seco.dary αphase(αs) on quasi-static mechanical properties is still not very clear. The main co.troversy 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 microsco.y(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 co.sistent with this inference. By adjusting the solution treatment parameters and the subsequent aging treatment, three fine structures were obtained, and the co.responding 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

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 co.plex 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 co.responding tensile properties and fracture toughness. Results show that the fabricated alloy has a “basket-like structure” when the HIP temperature is below 950℃, co.sisting 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, acco.panied 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℃ *** co.responding 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 co.ducive 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

Texture evolution and slip mode of a Ti-5.5Mo-7.2Al-4.5Zr-2.6Sn-2.1Cr dual-phase alloy during co.d 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 co.plex micromechanical response among grains remains a persistent challenge to understand the deformation mechanism of titanium alloys during co.d ***,in this work,a multiscale crystal plasticity finite element method of dual-phase alloy was proposed and seco.darily 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 co.d 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(co.trast,the co.tribution 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 co.pelled by the neighboring pre-deformedα*** calculated pole figures,rotation axes,and co.pelled rotation behavior exhibited good agreement to the experimental results.

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

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 Eco.ogical 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 co.sists 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 co.petition 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

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 co.lege 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 microsco.e(SEM),particle size analysis,and Fourier transform infrared spectrosco.y(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 *** co.parison with most co.ventional pavement materials,it is found that the SSA of the formulated microcapsules is much larger while the thermal co.ductivity 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

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, co.pled with adjustable operation temperatures ranging from 150 to −45℃, are successfullyachieved through manipulation of the Zr/Ti ratio. This co.prehensive range of operation temperatures effectively addressesdiverse refrigeration application requirements, ranging from industrial equipment to freezer cabinets. This work not onlyundersco.es 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

co.parative study of mechanical and wear behavior of Cu/WS_2 co.posites fabricated by spark plasma sintering and hot pressing

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Journal of materials Science & technology 2017年第11期33卷 1416-1423页

作者： Qunchang Wang M inghui Chen Zhongmao Shan Chengguo Sui Lin Zhang Shenglong Zhu Fuhui Wang Key Laboratory for Anisotropy and Texture of materials (Ministry of Education) School of Material Science and Engineering Northeastern UniversityShenvang 110819 China AVIC chengdu Aircraft Design & Research institute Chengdu 610041 China AVIC chengdu Aircraft industrial (Group) co. Ltd Chengdu 610041 China Laboratory for co.rosion and Protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The mechanical and wear behavior of co.per-tungsten disulfide（Cu/WS_2） co.posites fabricated by spark plasma sintering（SPS） and hot pressing（HP） was investigated, co.paratively. Results indicated that the addition of lubricant WS_2 substantially reduced wear rate of the Cu matrix co.posites fabricated by SPS,and the optimum co.tent of WS_2 is 20 wt% with regard to the wear behavior. However, it affected a little to the wear rate while dramatically decreased the friction co.fficient of the co.posite fabricated by *** difference in friction behavior of the self-lubricating co.posites fabricated by the two techniques was closely related to their different mechanical properties. Severe interfacial reaction occurred during spark plasma sintering, leading to brittle phase formation at interface.

关键词： metal-matrix co.posites(MMCs) Hardness Self-lubricating Spark plasma sintering Interfacial reaction