首页|不同热处理条件下Ti-1023钛合金的绝热剪切敏感性

不同热处理条件下Ti-1023钛合金的绝热剪切敏感性

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利用Hopkinson压杆试验系统对圆柱形试样进行室温动态压缩冲击试验,研究不同热处理制度下Ti-1023钛合金的微观组织、绝热剪切带的形成特征.结果表明,相变点以上固溶处理使Ti-1023合金组织晶粒尺寸增大,β晶界处析出细针状α相;相变点以下的固溶时效使晶粒内部析出大量球状α相,相变点以下的固溶双重时效处理的组织晶粒更为细小均匀.在较高应变率加载条件下,不同组织均表现出明显的应变率增强和增塑效应,具有明显的热塑性失稳特征.相变点以上固溶时效组织动态强度高,但塑性差,绝热剪切敏感性最大;相变点以下固溶单重时效组织最不易发生绝热剪切,但强度低;固溶双重时效组织比固溶单重时效组织的动态强度高,塑性较好,具有最好的抗冲击承载能力.
Adiabatic shear sensitivity performance of Ti-1023 alloys at different heat treatment regimes
Using the Hopkinson pressure bar test system to conduct room temperature dynamic com-pression experiments for cylindrical samples,the formation characteristics of adiabatic shear bands and the microstructure of Ti-1023 titanium alloy under different heat treatment regimes were studied.The results show that the grain size of Ti-1023 alloy is increased by the solid solution treatment above the phase transition point.The fine acicular α phase precipitates at the β grain boundary.The solid solution aging below the phase transition point causes a large number of spherical α phases in the grains,and the grain size of the tissue grains with dual aging treatment is even smaller.Under the loading conditions of different strain rates,all different tissues show obvious strain rate enhancement and plasticizing effect,reflecting apparent characteristics of thermoplastic instability.The dynamic strength of the solid solu-tion aging group above the phase transition point was the highest,but the plastic difference was the worst and being presented with the greatest adiabatic shear sensitivity.It is the most difficult to produce adiabatic shear in the solid solution single aging structures below the phase transition point,but the ma-terial strength is low.The solid solution dual aging tissue has higher dynamic strength and better plasti-city than the solid solution single heavy aging tissue,which has the best resistance to impact bearing ca-pacity.

Ti-1023 titanium alloysolution and agingmechanical propertiesmicrostructureadiabat-ic shear

郭文静、张继林、贾海深、易湘斌、罗文翠

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兰州工业学院,甘肃省高校绿色切削加工技术及应用重点实验室,甘肃兰州 730050

兰州工业学院,甘肃省精密加工技术及装备工程研究中心,甘肃兰州 730050

Ti-1023钛合金 固溶时效 力学性能 微观组织 绝热剪切

甘肃省重点研发计划甘肃省重点人才项目甘肃省高等学校创新基金甘肃省产业支撑项目

22YF7GA132甘组通字[2022]77号2021B-3192021CYZC-52

2024

钢铁钒钛
攀钢集团攀枝花钢铁研究院有限公司

钢铁钒钛

CSTPCD北大核心
影响因子:0.395
ISSN:1004-7638
年,卷(期):2024.45(1)
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