Effect of grain boundary microstructure on fatigue crack propagation in austenitic stainless steel
Effect of grain boundary microstructure on fatigue crack propagation in austenitic stainless steel
复制标题
DOI：
10.1007/s10853-010-5238-1
复制
发表时间：
2011-01
影响因子：
4.5
通讯作者：
S. Kobayashi;Manabu Nakamura;S. Tsurekawa;Tadao Watanabe
中科院分区：
文献类型：
--
作者：
S. Kobayashi;Manabu Nakamura;S. Tsurekawa;Tadao Watanabe
为了控制奥氏体不锈钢的疲劳裂纹扩展，研究了晶界组织对疲劳裂纹扩展的影响。通过形变热处理控制了试样中低共线晶界的比例.具有较高比例低塑性边界（73%）的试样比具有较低比例低塑性边界（53%）的试样显示出较低的疲劳裂纹扩展速率。低塑性晶界含量越高，沿晶断裂段占裂纹总长度的比例越小。此外，还结合晶界微观结构研究了晶界在疲劳裂纹扩展中的作用，晶界的特征分布和几何构型。这表明，晶界工程的方法是适用于控制奥氏体不锈钢的疲劳裂纹扩展。
The effect of grain boundary microstructure on fatigue crack propagation in austenitic stainless steel was investigated in order to control fatigue crack propagation. The fraction of low-Σ coincidence boundaries in specimens was controlled by thermomechanical processing. The specimen with the higher fraction of low-Σ boundaries (73%) showed the lower propagation rate of fatigue crack than the specimen with the lower fraction of low-Σ boundaries (53%). The ratio of intergranular fracture segments to the total crack length was lower for the specimen with the higher fraction of low-Σ boundaries. Moreover, the roles of grain boundaries in the fatigue crack propagation were investigated in connection with grain boundary microstructure, i.e., the character distribution and geometrical configuration of grain boundaries. It is evidenced that the approach to grain boundary engineering is applicable to controlling fatigue crack propagation in austenitic stainless steel.