Temperature effects on hydrogen-induced crack growth susceptibility of iron-based superalloys
Temperature effects on hydrogen-induced crack growth susceptibility of iron-based superalloys
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DOI：
10.1016/s0013-7944(00)00122-3
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发表时间：
2001-04
影响因子：
5.4
通讯作者：
N. Moody;M. Baskes;S. Robinson;M. Perra
中科院分区：
文献类型：
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作者：
N. Moody;M. Baskes;S. Robinson;M. Perra
采用充氢裂纹扩展试样研究了温度对铁基高温合金IN903氢致裂纹扩展敏感性的影响。当温度从253 K升高到298 K时，测得的裂纹扩展速率增加了两个数量级。在较高的温度下，裂纹扩展速率下降。所有样品的断裂都是由基体碳化物的断裂引发的，随后是滑移带交叉处的微孔形成和互连滑移带段的失效。材料和力学方法相结合，然后模拟断裂过程和裂纹扩展速率。应用该模型的测试结果表明，该模型提供了一个定量准确和物理正确的描述氢和温度如何相互作用，以控制裂纹扩展敏感性在IN903。它支持的观察，在滑移带交叉处的微孔形成的断裂过程中的关键事件。裂纹尖端应力场和陷阱位置之间的相互作用控制裂纹扩展敏感性。
The effects of temperature on hydrogen-induced crack growth susceptibility were studied in the iron-based superalloy IN903 using hydrogen charged crack growth samples. The measured crack growth rates increased by more than two orders of magnitude as temperature increased from 253 to 298 K. Crack growth rates then decreased at higher temperature. Fracture in all samples initiated by fracture of matrix carbides followed by microvoid formation at slip band intersections and failure of interconnecting slip band segments. Materials and mechanics approaches were then combined to model the fracture process and crack growth rates. Application of the model to the test results showed that the model provides a quantitatively accurate and physically correct description of how hydrogen and temperature interact to control crack growth susceptibility in IN903. It supports the observation that microvoid formation at slip band intersections is the critical event in the fracture process. It further shows that the interaction between crack tip stress fields and trap sites controls crack growth susceptibility.