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Microstructure evolution of a new near-β titanium alloy:Ti555211 during high-temperature deformation

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Rare Metals 2015年第11期34卷 757-763页

作者： Zhen An Jin-Shan Li Yong Feng State Key Laboratory of Solidification Processing Northwestern Polytechnical University

The isothermal compression testing of Ti555211 titanium alloys was carried out at deformation temperatures from 750 to 950 ℃ in 50 ℃ intervals,with strain rate of 0.001-1.000 s-1and height reduction of 20%-60%.The effect of processing parameters（deformation temperature,strain rate and deformation degree） on the microstructure evolution and the microstructure variables was *** results show that the content of primary α phase decreases with the increase in deformation *** effect of strain rate on microstructure variables of isothermally compressed Ti555211 alloy is mainly dependent on the deformation *** fine second α phase partly transforms to β phase due to the deformation heat effect at the high strain rate,α phase becomes globular with temperature increasing and strain rate *** contrast,α phase is refined with temperature decreasing and strain rate *** deformation degree has a little influence on the grain size and the morphology of primary α phase,but the effect of deformation degree on the morphology of second α phase is *** larger deformation degree is in favor of the globularization of lamellar α structure.

关键词： Titanium alloy high-temperature deformation Micros

AN INVESTIGATION OF high-temperature deformation STRENGTHENING AND TOUGHENING MECHANISM OF TITANIUM ALLOY

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Acta Metallurgica Sinica(English Letters) 1998年第5期11卷 376-382页

作者： Y.G.Zhou W.D.Zing H.Q.Yu Northwestern Polytechnical Univ Xi'an China

The high-temperature deformation strengthening and toughening mechanisms of titanium alloys have been investigated in this paper. The materials processed by this method produce a new tri-modal microstrvcture, which consists of 10-20% equiaxed alpha, streaky alpha and transformed beta matrix. It is found that the higher ductility of tri-modal microstructure is attributed to the equiaxed alpha's coopemtive slip and coordinated deformation with the transformed beta matrix. The streaky alpha phases not only increase the strength and creep properties, but also increase the fracture toughness. Propagating along grain boundaries between two neighboring streaky alpha phases, cracks in tri-modal microstructure make a more tortuous way, and then the materials show a higher fracture toughness. This new method is applicable to α, near α,α+β and near β titanium alloys.

关键词： titanium alloy high-temperature deformation strengthening and toughening mechanism

Modeling flow stress and grain size of GCr15 bearing steel at hightemperature deformation near end of solidification

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Journal of Iron and Steel Research International 2023年第1期30卷 88-101页

作者： Rui-hao Li Hai-jun Li Ning Xiang Guo-dong Wang Li-juan Bai The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina HBIS Group Technology Research Institute Shijiazhuang 050000HebeiChina

Hot-core heavy reduction rolling is an innovative technology for continuous casting billet at the end of *** deformation characteristics of GCr15 bearing billet were investigated over the temperature range of 1000-1300℃ with the strain rate of 0.001-10 s^(-1) by the Gleeble 3800 thermo-mechanical ***,the true stress-strain data are calibrated by the friction correction method to acquire accurate parameters near the ***,the Laasraoui-type constitutive model and dynamic austenite grain size model are established by the thermal compression results and corrosion experimental results,and the predicted values of the experimental interval are obtained by using the ***,the accuracy of models is verified by comparing the predicted curves with the experimental *** but not the least,the dynamic parameters between solidus and liquidus are predicted by the two models,and the difficulty of experimental collecting near the melting point is solved.

关键词： Hot-core heavy reduction rolling high-temperature deformation GCr15 bearing billet Dynamic recrystallization Dynamic grain model

Digital image correlation for the deformation measurement of high-temperature materials

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Digital image correlation for the deformation measurement of...

Hot deformation behavior and microstructure features of FeCrAl-ODS alloy

创新塑性加工技术，推动智能制造发展——第十五届全国塑性工程学会年会暨第七届全球华人塑性加工技术交流会

作者： Z.Z.Tang H.Hu J.Liang X.Guo XI'AN XINTUO 3D OPTICAL MEASUREMENT TECHNOLOGY CO. LTD. Xi'an Jiaotong University

To slove the problem of thermal deformation measurement of the aircraft materials and\or components at high-temperature, a non-contact measurement method based on the digital image correlation is proposed and implemented. A high-performance experimental system, with an electric current heating device and an active imaging setup, is designed to reproduce the transient thermal environments experienced by hypersonic vehicles and to capture the digital images of the test specimen surface at various temperatures. A bandpass filter, a linear polarizing filter and some neutral density filters are used to reduce the intensity and noise in the images. The captured images are processed by a seed-point diffusion algorithm and a fractionized facet tracking algorithm we proposed recently to extract the full-field thermal deformation. Experimental results demonstrate that the proposed technique is effective and robust for thermal deformation and strain measurement at the temperatures up to 2600℃, and has great potential in characterizing the thermo-mechanical behaviour of the aircraft materials and components.

关键词： Digital image correlation high-temperature deformation

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Journal of Iron and Steel Research International 2022年第9期29卷 1455-1463页

作者： Di-jun Long Shao-yu Qiu Wen-bo Liu Yong-duo Sun Wei Luo Hui-qun Liu Rui-qian Zhang Nuclear Power Institute of China Chengdu 610213SichuanChina School of Materials Science and Engineering Central South UniversityChangsha 410083HunanChina

The hot deformation behavior of FeCrAl-ODS alloys at temperatures of 1050-1200℃ and strain rates of 0.001-1 s^(-1),*** peak stress of FeCrAl-ODS alloy during hot deformation decreased with increasing temperature and decreasing strain *** addition,the stress-strain curves show a dynamic softening phenomenon according to the shape of the flow *** on the Arrhenius-type model,a constitutive equation and processing map of FeCrAl-ODS alloy were ***,we proposed optimum processing parameters of 1200℃ and 0.001 s^(-1)based on the processing *** with FeCrAl alloys,there was no significant phenomenon of grain coarsening during hot deformation in FeCrAl-ODS *** the electron backscattered diffraction images,both recrystallized and recovered grains were observed in the matrix under dfferent deformation *** fraction of dynamically recrystallized grains in the matrix under the deformation of 1100 C/0.001 s^(-1)(42.5%)was significantly higher than that at 1200℃/0.001 s^(-1)(10.6%),which was consistent with the stress-strain curves.

关键词： FeCrAl-ODS steel Oxide dispersion strengthening high-temperature deformation Processing map

Efect of Pre‑stretch Strain at high temperatures on the Formability of AZ31 Magnesium Alloy Sheets

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 48-60页

作者： Yongqiao Li Lifei Wang Xiaohuan Pan Qiang Zhang Guangsheng Huang Bin Xing Weili Cheng Hongxia Wang Kwang Seon Shin College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Chongqing Innovation Center of Industrial Big-Data Co.Ltd. National Engineering Laboratory for Industrial Big-Data Application TechnologyChongqing 400707China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Magnesium Technology Innovation Center School of Materials Science and EngineeringSeoul National UniversitySeoul 881416Republic of Korea

high-temperature pre-stretching experiments were carried out on the AZ31 Mg alloy at 723 K with strain levels of 2.54%,6.48%,10.92%,and 19.2%to alter the microstructure and texture for improving room-temperature *** results showed that the strain-hardening coefcient increased,while the Lankford value *** addition,the Erichsen values of all pre-stretch sheets were enhanced compared with that of the as-received *** maximum Erichsen value increased from 2.38 mm for the as-received sample to 4.03 mm for the 10.92%-stretched sample,corresponding to an improvement of 69.32%.This improvement was mainly attributed to the gradual increase in grain size,and the(0001)basal texture was weakened due to the activated non-basal slip as the high-temperature pre-stretching strain levels *** visco-plastic self-consistent analysis was performed on the as-received and high-temperature pre-stretched *** confrmed the higher activity of the prismatic slip in 10.92%-stretched sample,leading to divergence and weakening of basal texture *** results in an augmentation of the Schmid factor under diferent slip ***,it can be concluded that high-temperature pre-stretching technology provided an efective method to enhance the formability of Mg alloy sheets.

关键词： high-temperature deformation Grain growth Magnesium alloys Texture Visco-plastic self-consistent modeling Formability

high-temperature Plasticity Enhanced by Multiple Secondary Phases in a high-Si Austenitic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1519-1530页

作者： Sihan Chen Tian Liang Guangcai Ma Chengwu Zheng Deli Chen Yingche Ma Kui Liu CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Fushun Sub Center of Technical Center Fushun Special Steel Group Co.Ltd.Fushun113001China

An austenitic stainless steel with 6 wt% Si and multiple secondary phases was produced with the aim to achieve enhanced plasticity during hot *** micro structure of the steel after fracture was characterized via electron back-scattered diffraction,transmission Kikuchi diffraction and scanning transmission electron *** the tail of the gage to the necking region,the microstructure of the material evolved from low-angle grain boundaries(LAGB s) to mixtures of LAGBs and high-angle grain boundaries(HAGBs),and fine equiaxed recrystallized *** elongation to failure in the tensile test exceeds 167%.During the hot deformation,continuous dynamic recrystallization of the austenitic matrix was promoted by the multiple secondary *** dislocations introduced by the secondary phases were rearranged and continuously transformed into *** initially coarse grains(30.5 μm) were refined into ultra-fine equiaxed grains(1 μm),which contributed significantly the enhanced plasticity during hot deformation of the *** the necking area of the sample,twins were nucleated in the stress concentration regions and accommodated the local strain by discontinuous dynamic recrystallization,which was also beneficial to improving the plasticity.

关键词： high-Si austenitic stainless steel high-temperature deformation Plasticity enhancement Dynamic recrystallization Secondary phases

A crystal plasticity coupled damage constitutive model of high entropy alloys at high temperature

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Acta Mechanica Sinica 2022年第11期38卷 16-25页

作者： Yingying Wang Jundong WangMingqi Lei Yao Yao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China School of Civil Engineering Xi’an University of Architecture and TechnologyXi’an710055China

A crystal plasticity constitutive model of high-entropy alloys(HEAs)coupled with damage evolution equation at high temperature is *** simulate the degraded load-carrying capacity of HEAs caused by microdefects,a phenomenological damage evolution equation is proposed based on the compression experiments at different *** established model is used to simulate the stress softening phenomenon of polycrystalline AlCrCuFeNi-based HEAs,which is highly dependent on the strain rate and *** with the experimental data,the proposed model is able to accurately describe the stress-strain relationship of HEAs.

关键词： high entropy alloy Crystal plasticity Damage high-temperature deformation