Formation and evolution of porosity during high temperature creep of a nickel-based single crystal superalloy

E3S Web of Conferences

卷:155

Liu Weiwei¹  Zhang Mai¹  Zhang Jian¹  Guo Yuanyuan¹ 

[1] Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials;

关键词: single crystal superalloy;    creep;    dislocation;    porosity;   

DOI  :  10.1051/e3sconf/202015501005

来源: DOAJ

【 摘 要 】

A Re-containing single-crystal superalloy was used to research the high temperature low stress creep behavior. Transmission electron microscope, scanning electron microscope and some other research methods are employed. The results and analysis are summarized below: Two mechanisms for the steady creep are found in this experiment. The volume fraction of pores after creep test at 1100°C increased more than 2 times compared with that before test, but the increasing at 1000°C is relatively small, which reveals that temperature has an great influence on the formation of pore during creep; There are two types of pores associated with fracture during the creep process. One is the casting shrinkage located between the interdentritic, which is formed in the solidification of the alloy. Another type of pore is nucleated and growing during the creep deformation.

【 授权许可】

Unknown