摘要
１．ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｏｒｄｅｒｔｏｐｒｅｄｉｃｔｌｉｖｅｓｏｆｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｃｏｍｐｏｎｅｎｔｓ，ｉｔｉｓｉｍｐｏｒｔａｎｔｔｏｉｎｖｅｓｔｉｇａｔｅｃｒａｃｋｇｒｏｗｔｈｂｅｈａｖｉｏｒｏｆｍａｔｅｒｉａｌｓｕｎｄｅｒｃ...
The effects of cyclic loading on crack growth, fracture feature and
rupture life of superalloy GH2132 have been studied in the present paper. The crack growth
tests were carried out at 550 on compact tension specimens under a wide range of load levels
and various periods of hold time, and the fracture surfaces were examined on a scanning
electron microscope. The results show that, for both static and cyclic creep, Stage-I of crack
growth is related with initial test stress, during which the crack extension is about 0.5mm, and
that the final effect of cyclic loading on rupture life depends on the counteraction of its two
reversed effects on crack growth rate before and after the point n=0.2.
