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Constitutive equation and hot processing maps of Al-5Ti-1B master alloy

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Rare Metals 2018年第8期37卷 668-674页

作者： Fu-Wei Kang Jie Zhou Zhi-Wei Wang Xue-Min Zhang Yi-Cheng Feng Er-Jun Guo School of Materials Science and Engineering Harbin Universityof Science and Technology Harbin 150040 China Harbin Dong An Engine Group Corporation Ltd. Aviation Industry Corporation of China Harbin 150066 China

The isothermal compression tests of A1-5Ti- 1B master alloy were conducted on the thermal mechanical simulator Gleeble-1500D at the deformation temperature range of 300-450 ℃,the strain rate range of 0.01- 10.00 s^-l, and the engineering strain of 50 %. The effects of deformation temperatures and strain rates on the flow stress were analyzed by the true stress-true strain curves. The result indicates that the flow stress increases with the increase of strain rate, while it decreases with the increase of temperature. The hot deformation activation energy of A1-5Ti-IB master alloy is calculated to be 250.9 ***^-1, and the constitutive equation is established as ε=1.97 x lO^19[sinh（O.O15δ）^11.14exp（-250.9/RT）, and the validity of this constitutive equation is verified. Based on dynamic material model （DMM） criterion, the hot processing map of AI-5Ti-1B master alloy is obtained. The optimum hot extrusion conditions are determined as deformation temperature of 400℃ and strain rate of 1.00 s^-1, and the flow instability only appears at the temperature range of 300-340℃ at the base of the hot processing map.

关键词： Al-5Ti-1B master alloy Flow stress Constitutive equation hot processing map

Research progress on microstructure evolution and hot processing maps of high strength β titanium alloys during hot deformation

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Transactions of Nonferrous Metals Society of China 2022年第12期32卷 3835-3859页

作者： Liang HUANG Chang-min LI Cheng-lin LI Song-xiao HUI Yang YU Ming-jie ZHAO Shi-qi GUO Jian-jun LI National Key Laboratory for Precision hot processing of Metals Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Materials processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China State Key Laboratory of Nonferrous Metals&Processes GRIMAT Engineering Institute Co.Ltd.Beijing 100086China

High strength β titanium alloys are widely used in large load bearing components in the aerospace field. At present, large parts are generally formed by die forging. Different initial microstructures and deformation process parameters will significantly affect the flow behavior. To precisely control the microstructures, researchers have conducted many studies to analyze the microstructure evolution law and deformation mechanism during hot compression. This review focuses on the microstructure evolution of high strength β titanium alloys during hot deformation, including dynamic recrystallization and dynamic recovery in the single-phase region and the dynamic evolution of the α phase in the two-phase region. Furthermore, the optimal hot processing regions, instability regions,and the relationship between the efficiency of power dissipation and the deformation mechanism in the hot processing map are summarized. Finally, the problems and development direction of using hot processing maps to optimize process parameters are also emphasized.

关键词： high strengthβtitanium alloy hot deformation microstructure evolution hot processing map

Mechanical properties and thermal deformation behavior of low-cost titanium matrix composites prepared by a structure-optimized Y_(2)O_(3) crucible

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Journal of Iron and Steel Research International 2024年第3期31卷 738-751页

作者： Qian Dang Gang Huang Ye Wang Chi Zhang Guo-huai Liu Zhao-dong Wang The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150004HeilongjiangChina School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina

A porous yttrium oxide crucible with both thermal shock resistance and erosion resistance was developed by structural *** structure-optimized yttrium oxide crucible was proved to be suitable for melting highly reactive titanium ***-cost(TiB+Y2O_(3))-reinforced titanium matrix composites were prepared by vacuum induction melting using the prepared *** thermal deformation behavior and microstructure evolution of(TiB+Y2O_(3))-reinforced tita-nium matrix composites were investigated at deformation temperatures of 900-1100℃with strain rates of 0.001-1 *** results showed that the prepared yttrium oxide crucible had both thermal shock and erosion resistance,the low-cost titanium matrix composites could be prepared by the developed yttrium oxide crucibles which were homogeneous in composition and highly sensitive to strain rate and deformation temperature,and the peak and theological stresses decreased with increasing deformation temperature or decreasing strain *** addition,the average thermal deformation activation energy of the composites was calculated to be 574.6 kJ/mol by establishing the Arrhenius constitutive equation in consideration of the strain variables,and the fitting goodness between the predicted stress value and the measured value was 97.624%.The calculated analysis of the hot processing map showed that the best stable thermal deformation zone was located in the deformation temperature range of 1000-1100℃and strain rate range of 0.001-0.01 s^(-1),where the peak dissipation coefficient wasη=71%.In this zone,the deformation of the reinforcement and matrix was harmonious,the reinforcement was less likely to fracture,dynamic recrystallization occurred more fully and the alloy exhibited near steady rheological characteristics.

关键词： Yttrium oxide crucible Titanium matrix composite Thermal deformation behavior Constitutive equation hot processing map Microstructure evolution

hot Deformation Behavior of SA508GR.4N Steel for Nuclear Reactor Pressure Vessels

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Journal of Iron and Steel Research International 2016年第12期23卷 1342-1348页

作者： Ning LIU Zheng-dong LIU Xi-kou HE Zhi-qiang YANG Long-teng MA Faculty of Materials Science and Engineering Kunming University of Science and Technology Institute for Special Steels Central Iron and Steel Research Institute

A hot compression experiment （1073 1473 K, strain rates of 0. 001-10 s -1 ） of SAS08GR. 4N low alloy steel was performed using a Gleeble-3800 thermal-mechanical simulator, and the hot deformation behavior of the steel was investigated by analyzing both the true stress true strain curves and its microstructures. The thermal de formation equation and hot deformation activation energy （Q） of SA508GR. 4N steel were obtained by regression with a classic hyperbolic sine function. The hot processing map of SAS08GR. 4N steel was also established. An empirical equation for the stress peak was described for practical applications. The SA508GR. 4N steel showed a critical Zener-Hollomon parameter （lnZc） for dynamic recrystallization （DRX） of 37.44, below which full DRX may occur. The sensitivity of the SA508GR. 4N steel increased linearly with test temperature, such that higher temperatures led to enhanced workability.

关键词： SA508GR. 4N steel dynamic recrystallization hot deformation equation hot processing map ZenerHollomon parameter

Mechanical Behavior and Constitutive Equation of High Temperature Compression Deformation of IN706 Superalloy

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稀有金属材料与工程 2024年第8期53卷 2182-2192页

作者： Du Licheng Gao Feng Dong Zhuolin AECC Aero Science and Technology Co. LtdChengdu 610503China

IN706 superalloy is particularly sensitive to the parameters of hot working *** flow stress of the IN706 superalloy was investigated during reduction deformation of 30%,45%,and 60%under the isothermal compression conditions of temperature at 1143–1393 K and strain rate at 0.01,0.1,0.5,and 1 s^(−1).The exponent-type Zener-Hollomon equation was used to describe the impact of strain and temperature on the thermal ***,the strain effect of various material constants,such asα,n,Q,and lnA,was considered in the constitutive equation considering the strain compensation,and the correlation coefficient R and the average absolute relative error were *** the basis of constitutive equation construction,the hot processing map of IN706 superalloy was drawn,and the instability region was obtained based on the Murty *** show that the reasonable thermal working process parameter window is strain rate of 0.1 s^(−1)and temperature of 1313–1353 K.

关键词： IN706 superalloy mechanical behavior constitutive equation hot processing map strain effect

hot deformation behavior of high Ti 6061 Al alloy

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Transactions of Nonferrous Metals Society of China 2016年第2期26卷 369-377页

作者：陈微官英平王振华燕山大学先进锻压成形技术与科学教育部重点实验室秦皇岛066004

The hot deformation behavior of a high Ti 6061 aluminum alloy in the temperature range from 350 to 510 ℃ and strain rate range from 0.001 to 10 s^-1 was investigated using stress-strain curve analysis, processing map, transmission electron microscopy and electron backscatter diffraction analysis. The results show that the peak stress decreases with increasing deformation temperatures and decreasing strain rate. The average deformation activation energy is 185 kJ/mol in the parameter range investigated. The flow stress model was constructed. The main softening mechanism is dynamic recovery. The processing map was obtained using dynamic material model, and the suggested processing window is 400-440℃ and 0.001-0.1 s^-1.

关键词： 6061 A1 alloy hot deformation dynamic recovery hot processing map dislocation

hot working characteristics of HEXed PM nickel-based superalloy during hot compression

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Transactions of Nonferrous Metals Society of China 2020年第10期30卷 2709-2723页

作者： Gang TAN Hui-zhong LI Yan WANG Lei YANG Shi-chang QIAO Zheng-qin HUANG Min-xue LIU School of Materials Science and Engineering Central South UniversityChangsha 410083China National Key Laboratory for Precision hot processing of Metals Harbin Institute of TechnologyHarbin 150001China School of Aeronautics and Astronautics Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

To study the hot deformation behavior of a new powder metallurgy nickel-based superalloy,hot compression tests were conducted in the temperature range of 1020−1110℃ with the strain rates of 0.001−1 s^−*** is found that the flow stress of the superalloy decreases with increasing temperature and decreasing strain *** accurate constitutive equation is established using a hyperbolic-sine type ***,processing map of the alloy is constructed to optimize its hot forging *** domains of dynamic recrystallization stability and instability regions are identified from the processing map at a strain of 0.7,*** adiabatic shear band,intergranular crack and a combination of intergranular crack and wedge crack are demonstrated to be responsible for the *** analyzing the processing map and microstructure,the optimal isothermal forging conditions for the superalloy is determined to be t=1075−1105℃ andε&=10^−3−10−2.8 s^−1.

关键词： powder metallurgy nickel-based superalloy hot deformation behavior constitutive equation hot processing map dynamic recrystallization

Microstructure evolution and hot deformation behavior of Cu–3Ti–0.1Zr alloy with ultra-high strength

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Transactions of Nonferrous Metals Society of China 2020年第10期30卷 2737-2748页

作者： Xu WANG Zhou LI Zhu XIAO Wen-ting QIU School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Key Laboratory of Non-ferrous Metal Materials Science and Engineering Ministry of EducationChangsha 410083China

The hot compression deformation behavior of Cu−3Ti−0.1Zr alloy with the ultra-high strength and good electrical conductivity was investigated on a Gleeble−3500 thermal-mechanical simulator at temperatures from 700 to 850℃ with the strain rates between 0.001 and 1 s^−*** results show that work hardening,dynamic recovery and dynamic recrystallization occur in the alloy during hot *** hot compression constitutive equation at a true strain of 0.8 is constructed and the apparent activation energy of hot compression deformation Q is about 319.56 kJ/*** theoretic flow stress calculated by the constructed constitutive equation is consistent with the experimental result,and the hot processing maps are established based on the dynamic material *** optimal hot deformation temperature range is between 775 and 850℃ and the strain rate range is between 0.001 and 0.01 s^−1.

关键词： Cu−3Ti−0.1Zr alloy hot deformation constitutive equation recrystallization hot processing map