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DZ40M合金高温低周疲劳性能及其断口分析

姜文辉 , 姚向东 , 管恒荣 , 胡壮麒

金属学报

测定了定向凝固钴基高温合金DZ40M900℃低周疲劳性能并观察了疲劳断口.结果表明:DZ40M合金具有较高的抗高温低周疲劳性能;疲劳裂纹起源于试样表面优先氧化的碳化物,基体中骨架状分布的碳化物阻滞裂纹扩展;氧化不仅促进疲劳裂纹的形成,而且加速了裂纹扩展DZ40M合金的高温疲劳破坏是机械疲劳与环境氧化双重作用所致.

关键词: 定向凝固 , cobalt-base superalloy , low cycle fatigue , high temperature oxidation , fracture analysis

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

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 110006 , China

金属学报(英文版)

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 , null , null , null , null

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