Effects of Long-term Aging Treatment on Stress Rupture Properties of FGH95 Ni-base Superalloy
The effect of long-term aging on stress rupture properties was investigated by means of microstructure observation and properties measurement.The results showed that,after long-term aging for 500 h at 723 K,the coarser particle-like ?? phase was precipitated along the grain boundaries of alloy,significant amount of ?? particles were regularly distributed within the grain.Moreover,some carbide particles precipitated depressively along the boundaries and within the grain.As the aged time and temperature increased,the size of fine ?? particles in the alloy increased slightly,and the stress rupture property of the alloy decreased under the condition of 923K and 1034MPa.The deformation features of the alloy during creep were that the dislocations slip in the matrix or shear into the ?? phase,the dislocations shearing into the ?? phase may be decomposed to form the configuration of the two partial-dislocations plus stacking fault.As the creep went on,the slipping traces with different orientations appeared in the surface of the specimen,and some slipping steps were formed in the region near the boundaries,which may cause the stress concentration to promote the initiation and propagation of the cracks along the boundaries up to creep fracture.
FGH95 alloy:Long term aging:Microstructure:Stress Rupture Property
Sugui Tian Guangliang Xie Jun Xie Xiaoming Zhou
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Chi Beijing Institute of Aeronautical Materials, Beijing 100095, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
684-689
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）