Creep-Fatigue Interactions in P91 Steel
Creep-Fatigue Interactions in P91 Steel
复制标题
P91 钢的蠕变疲劳相互作用
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Klenk
中科院分区：
文献类型：
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作者：
M. Speicher;A. Klenk
为了确定和量化蠕变-疲劳相互作用对P91钢蠕变-疲劳裂纹扩展（CFCG）裂纹行为的影响，进行了保持时间长达60分钟的试验，并与疲劳裂纹扩展（FCG）和蠕变裂纹扩展（CCG）试验的结果进行了比较。结果表明，保温时间的引入对裂纹萌生时间有影响，但对裂纹扩展没有影响。在保持时间为60分钟的情况下，CCG和CFCG测试的差异非常小。为了表征断裂模式，在CFCG试验后对选定的试样进行了金相分析。所有试样的裂纹路径均为晶间裂纹，裂纹尖端周围均存在高空洞密度区域。通过对比CFCG、FCG和CCG的结果，最终可以发现，保温时间为6和60 min的试件，其裂纹扩展速率与蠕变荷载作用下的试件相似。
To determine and quantify the influence of creep-fatigue interactions on the crack behaviour of P91 steel creep-fatigue crack growth (CFCG) tests were carried out with holding times up to 60 minutes and compared to results from fatigue crack growth (FCG) and creep crack growth (CCG) tests. It was found that the introduction of a holding time influences the crack initiation time but not the crack propagation. With holding times of 60 minutes, the difference between CCG and CFCG tests is very small. To characterise the fracture mode metallographic analyses were performed on selected specimens after CFCG tests. The crack path is inter-granular and an area of high cavity density was identified around the crack tip in all specimens. By comparing CFCG, FCG and CCG results, it can be finally noticed that specimens with a holding time of 6 and 60 min show a similar crack growth rate as samples under creep loading.