K40S钻基高温合金的高温低周疲劳行为Ⅱ.疲劳断口分析

来源 :金属学报 | 被引量 : 0次 | 上传用户：jerryzhang1805

【摘要】

：

研究了K40S钴基高温合金在700℃和900℃温度条件下由应变控制的高温低周疲劳行为,对疲劳断口形貌进行观察,结果表明:在高温低周疲劳加载条件下,K40S合金疲劳裂纹萌生机制为表

【作者】

：

杨富民孙晓峰管恒荣胡壮麒

【机构】

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中国科学院金属研究所

【出处】

：

金属学报

【发表日期】

：

2004年期

【关键词】

：

钴基高温合金裂纹萌生裂纹扩展环境氧化

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研究了K40S钴基高温合金在700℃和900℃温度条件下由应变控制的高温低周疲劳行为,对疲劳断口形貌进行观察,结果表明:在高温低周疲劳加载条件下,K40S合金疲劳裂纹萌生机制为表面滑移带开裂与表面碳化物相界面开裂的综合作用;疲劳裂纹萌生与扩展方式为穿晶型,瞬断区呈现枝晶断裂特征;碳化物可作为障碍,阻碍疲劳裂纹的扩展,且为主要的二次裂纹策源地;K40S合金高温低周疲劳断裂为机械疲劳与高温环境氧化共同作用的结果.

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K40S钻基高温合金的高温低周疲劳行为Ⅱ.疲劳断口分析

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