EFFECT OF REVERT RECYCLE TIMES ON MICROSTRUCTURE AND FATIGUE PROPERTIES IN COBALT-BASE SUPERALLOY K640S

查看全文 作　　者：T.L. Wang 1,2) , J.T. Guo 1) , D.S. Xia 2) , Y.Wang 1) and H.C. Yang 2) 1) Institute of Metal Research, Chinese Academy of Science, Shenyang 110015,China 2) Material and Metallurgical Institute Northeastern University, Shenyang 110 出　　处：《Acta Metallurgica Sinica(English Letters)》索引1999年第12卷第5期,共4页 摘　　要：Effect of revert cycles on microstructure and fatigue properties of cast cobalt base superalloy K640S has been investigated. The results show that: at 70 times of cool heat cycles, there were microcracks found in seven times revert and ten times revert. With the increasing of thermal fatigue cycles, the crack of revert grows a little faster than virgin. When the cycle time reaches 200, the crack length for both virgin and reverts have been as long as 2mm. The low cycle fatigue life has no remarkable change, with the increase of revert cycles at 815℃, 360MPa ,0 5Hz. With the times of cycles increasing, it is found that the content of impurity and gas in alloy change a little, and there is no obvious change for dendrite microstructure. 关 键 词：REVERT cobalt-base SUPERALLOY thermal FATIGUE low cycle FATIGUE MICROSTRUCTURE