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Crack growth under constant sustained load at elevated temperature in 1N718 superalloy

机译:1N718高温下在恒定持续载荷下于高温下的裂纹扩展

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Crack growth rate (da/dt) in 1N7 18 nickelbase superalloy has been studied at 600 and 700℃, inboth compact tension and corner crack specimens, undersustained constant load conditions, generating anintergranular fracture mode. Using the stressintensity factor, K, as the correlating parameter,slower growth rates are found for corner cracks thanfor the through cracks in CT specimens together witha greater degree of crack tunneling. In the CT specimens,the introduction of lateral side grooves increases thecrack growth rate. Disparities found between growthrates in the CC geometry are found to correlate withthe incubation time for re-initiation of crack growth,which is attributed to a crack tip blunting and creepmechanism. A limited assessment of the correlation ofgrowth rates using the creep crack growth parameter C~ is made.
机译:研究了1N7 18镍基高温合金在600和700℃下的裂纹扩展速率(da / dt),包括致密拉伸和角裂纹样品,在持续恒定载荷条件下,产生晶间断裂模式。使用应力强度因子K作为相关参数,发现角部裂纹的生长速率比CT试样中的贯通裂纹低,而且开裂程度更高。在CT样品中,引入侧向沟槽可提高裂纹的生长速率。在CC几何形状中发现的增长率之间的差异与裂纹重新开始的保温时间有关,这归因于裂纹尖端的钝化和蠕变机制。使用蠕变裂纹扩展参数C〜对生长速率的相关性进行了有限的评估。

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