摘要
针对Ti2AlNb粉末冶金近净成形部件在固溶热处理后开裂的问题进行了分析。结果表明:热等静压过程中包套发生微泄漏,炉腔中高温高压氩气进入包套内部,形成微孔隙类缺陷;这些孔隙在热处理的过程中会发生膨胀形成热诱导孔洞,使部件受到拉应力形成严重的应力集中成为裂纹源,而Ti2AlNb合金属于脆性材料对缺口敏感,一旦裂纹形成会迅速扩展造成部件开裂。
One cracking Ti2AlNb powder metallurgy near net shape forming component after solution heat treatment is analyzed in this paper.Slight capsule gas leakage during hot isostatic pressing(HIPing)has been investigated,the results show that the high-temperature and high-pressure argon during the hot isostatic pressing is introduced into the capsule.Argon will not be dissolved or be absorbed within titanium alloy and the argon existed in the form of uncombined element in titanium alloys causing pore defects which are harmful for the mechanical properties of the material.These pores are expanded to form temperature induced pores(TIP pores)during heat treatment,and this usually results in damage to the mechanical properties of the material,which may also cause cracking of the material.Ti2AlNb alloys belong to brittle materials,which are sensitive to notches.Once cracks are formed,they propagate rapidly and then cause cracking.
作者
徐磊
吴杰
崔潇潇
郭瑞鹏
杨锐
XU Lei;WU Jie;CUI Xiaoxiao;GUO Ruipeng;YANG Rui(Titanium Alloys Division,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《航空制造技术》
2020年第16期14-20,共7页
Aeronautical Manufacturing Technology
基金
中国科学院战略性先导科技专项(A类)(XDA22010102)
辽宁省博士科研启动基金计划项目(2019-BS-252)。
