置氢TC17钛合金组织演变规律及高温变形行为  

Microstructure Evolution and Deformation Behavior of Hydrogenated TC17 Titanium Alloy

作　　者：周昊 王耀奇 李红 任学平[1] 侯红亮 Zhou Hao;Wang Yaoqi;Li Hong;Ren Xueping;Hou Hongliang(School of Material Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国航空制造技术研究院,北京100024

出　　处：《稀有金属材料与工程》2023年第3期947-952,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52075509)。

摘　　要：为了改善了TC17钛合金热加工性能,对TC17钛合金进行了置氢处理,通过金相观察和X射线衍射分析,研究了置氢后TC17钛合金的微观组织及相转变规律,在变形温度800~860℃、应变速率0.001~0.1 s^(-1)的条件下,对置氢TC17钛合金进行了高温压缩试验,研究了置氢TC17钛合金的热变形行为,并对其热变形激活能进行了计算分析。结果显示,TC17钛合金原始组织为典型的网篮组织,由α+β相组成,随着氢含量的增加,针状α相数量减少,β相增多,当氢含量超过0.40%(质量分数)时,钛合金中依次出现了γ氢化物和δ氢化物。置氢TC17钛合金不仅是温度敏感型材料、速率敏感型材料,也是氢含量敏感型材料,在氢含量0.2%时,峰值应力达到最小值,与原始合金相比,变形温度可降低40℃,应变速率可提高1个数量级。同时,氢含量0.2%的TC17钛合金变形激活能也达到最小值162 kJ/mol,其热变形软化机制为动态回复。In order to improve the hot workability of TC17 titanium al loy,TC17 titanium alloy was hydrogenated.The microstructure and phase transformation law of TC17 titanium alloy were studied by OM and XRD after hydrogenated treatment.Under the conditions of deformation temperature of 800~860℃and strain rate of 0.001~0.1 s^(-1),the isothermal compression tests of hydrogenated TC17 titanium alloy were carried out.The deformation behavior of the hydrogenated TC17 titanium alloy was studied,and the thermal activation energy was calculated and analyzed.The results show that the microstructure of TC17 titanium alloy is a typical net basket structure,which is composed ofα+βphase.With the increase of hydrogen content,the volume fraction of acicularαphase decreases,and the volume fraction ofβphase.When the hydrogen content exceeds 0.40wt%,theγandδhydrides separate out.The hydrogenated TC17 titanium alloy is not only a temperature sensitive material,a rate sensitive material,but also a hydrogen content sensitive material.When the hy drogen content is 0.2wt%,the peak stress reaches the minimum value.Compared with the original alloy,the deformation temperature can be decreased by 40℃and the strain rate increases by one order of magnitude.At the same time,the thermal activation energy of TC17 titanium alloy with 0.2wt%hydrogen content also reaches the minimum value of 162 kJ/mol,and its thermal deformation softening mechanism is dynamic recovery.

关 键 词：TC17钛合金 置氢处理 微观组织 变形行为 热激活能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]