Cracking Analysis of Powder Metallurgy Ti2AlNb Component During Heat Treatment
XU Lei1 , WU Jie1 , CUI Xiaoxiao1 , GUO Ruipeng2 , YANG Rui1
(1. Titanium Alloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
Abstract：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.
2020, 
