Grain boundary engineering for control of fatigue crack propagation in austenitic stainless steel
Grain boundary engineering for control of fatigue crack propagation in austenitic stainless steel
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DOI：
10.1016/j.proeng.2011.04.021
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Kobayashi;Masashi Hirata;S. Tsurekawa;Tadao Watanabe
中科院分区：
文献类型：
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作者：
S. Kobayashi;Masashi Hirata;S. Tsurekawa;Tadao Watanabe
研究了晶界微观结构在循环变形过程中疲劳裂纹扩展中的作用，以证明晶界工程在控制 SUS304 奥氏体不锈钢疲劳裂纹扩展方面的实用性。研究发现，具有较高比例的低Σ边界的多晶样品比具有较低比例的样品表现出较低的裂纹扩展速率。晶界微观结构对疲劳裂纹的偏转、路径和局部扩展速率起着重要作用。 SUS304不锈钢中引入较高比例的{111}/Σ3边界导致晶间断裂对总裂纹长度的贡献较低，并且疲劳裂纹的局部扩展速率较低。
The roles of grain boundary microstructure in fatigue crack propagation during cyclic deformation were investigated in order to evidence the utility of grain boundary engineering for control of fatigue crack propagation in SUS304 austenitic stainless steel. It was found that the polycrystalline specimen with a higher fraction of low-∑ boundaries shows a lower crack propagation rate than the specimen with a lower fraction of them. Grain boundary microstructures play important role in the deflection, path and the local propagation rate of fatigue crack. The introduction of a higher fraction of {111}/∑3 boundaries leads to a lower contribution of intergranular fracture to the total crack length and a lower local propagation rate of fatigue crack in SUS304 stainless steel.