Characterization of hot deformation and microstructure evolution of a new metastableβtitanium alloy
一种新型亚稳β钛合的热变形行为及显微组织演变表征作者机构：National Key Laboratory for Precision Hot Processing of MetalsHarbin Institute of TechnologyHarbin 150001China School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China College of Mechanical and Electrical EngineeringHuangshan UniversityHuangshan 245021China
出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)
年 卷 期：2022年第32卷第5期
页 面：1513-1529页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：metastableβtitanium alloy hot deformation behavior microstructure evolution abnormal flow behavior
摘 要：The hot deformation characteristics of as-forged Ti−3.5Al−5Mo−6V−3Cr−2Sn−0.5Fe−0.1B−0.1C alloy within a temperature range from 750 to 910℃and a strain rate range from 0.001 to 1 s^(-1) were investigated by hot compression *** stress−strain curves show that the flow stress decreases with the increase of temperature and the decrease of strain *** microstructure is sensitive to deformation *** dynamic recrystallization(DRX)grains appear while the temperature reaches 790℃at a constant strain rate of 0.001 s^(-1) and strain rate is not higher than 0.1 s^(-1) at a constant temperature of 910℃.The work-hardening rateθis calculated and it is found that DRX prefers to happen at high temperature and low strain *** constitutive equation and processing map were *** average activation energy of the alloy is 242.78 kJ/mol and there are few unstable regions on the processing map,which indicates excellent hot *** the strain rate of 0.1 s^(-1),the stress−strain curves show an abnormal shape where there are two stress peaks *** can be attributed to the alternation of hardening effect,which results from the continuous dynamic recrystallization(CDRX)and the rotation of DRX grains,and dynamic softening mechanism.
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