Ductile Crack Growth Resistance in Hydrogen-Charged Steels.
Ductile Crack Growth Resistance in Hydrogen-Charged Steels.
复制标题
充氢钢的延性裂纹扩展抗力。
DOI：
10.2320/matertrans.42.132
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发表时间：
2001
影响因子：
1.2
通讯作者：
Toshiaki Kadokura
中科院分区：
文献类型：
--
作者：
M. Nagumo;H. Yoshida;Y. Shimomura;Toshiaki Kadokura
通过充氢钢的三点弯曲试验研究了氢对剪切局部化和相关裂纹形核的影响。在氢存在下，以 R 曲线斜率表示的延性裂纹扩展阻力降低，这种降低在沿晶界具有更丰富的滑移约束相的钢中更为明显。在充氢钢的断裂表面上观察到初级韧窝的尺寸增大和深度/宽度比减小，有时与准解理相关。通过有限元计算，充氢钢中裂纹尖端处的形核空隙体积分数随着应变局部化而增加，这与剪切不稳定性的增强相一致。讨论了在氢存在下塑性应变过程中空位型缺陷的演变，而不是第二相颗粒处的空洞成核，从而降低了延性裂纹扩展阻力。
The effect of hydrogen on the shear localization and associated crack nucleation has been investigated by means of a three point bending test of hydrogen-charged steels. The ductile crack growth resistance in terms of the slope of R-curve was lowered under the presence of hydrogen, the decrease being more pronounced in the steel with more abundant slip constraint phases along grain boundaries. Enlargement of size and reduction in depth/width ratio of primary dimples, occasionally associated with quasi-cleavage, were observed on the fracture surface of the hydrogen-charged steels. By means of a FEM calculation, the increase of the nucleation void volume fraction localized at the crack tip with strain localization as well was shown to take place in the hydrogen-charged steel in consistent with enhanced shear instablity. It was discussed that the evolution of vacancy-type defects, rather than void nucleation at second phase particles, in the course of plastic straining was enhanced under the presence of hydrogen, reducing the ductile crack growth resistance.
具有局部特征向量的大型内部全纯扩展图
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
Kagawa Kotaro;Takimoto Gaku;Seehausen Ole;Sefan Asamitsu;Miyu Suzuki;佐竹 翔平
通讯作者：
佐竹 翔平