GH2909合金锻件持久缺口敏感性组织分析

Structure analysis on stress rupture notch sensitivity for GH2909 alloy forgings

针对GH2909合金锻件呈现的不同程度缺口敏感性问题,采用金相分析、扫描电镜、断口分析等手段,开展持久试样组织分析。结果表明:在某种特定的析出相分布状态下,GH2909合金是否呈现持久缺口敏感性是一个概率性事件;当Laves相连接成薄膜包覆晶界时,合金呈现缺口敏感性的概率显著提升。

Structure analysis on stress rupture specimens were conducted by the means of metallographic and SEM methods,to define the problem of different level notch sensitivity for GH2909 alloy forgings. The results show that whether the alloy exhibits persistent notch sensitivity is a probabilistic event to the GH2909 alloy with a particular phase distribution. The occurrence probability of notch sensitivity increases apparently when the Laves phase precipitates in film-like shape on grain boundary.