Along with the increase of the current density, cathode polarization effect, coating grain with increasing more and fine.
随着电流密度的增加﹐阴极极化作用随着增加﹐镀层晶粒越来越细。
It is found that the weld of fine grain steel break apart from heat effect zone in the tensile test.
经实验发现细晶粒碳钢焊接接头拉伸试验断口在远离热影响区的母材上。
The short cracks deflect more severe in coarse grain structure than in fine grain one, result in roughness induced crack closure effect, therefore exhibit slow crack growth rate.
粗晶组织比细晶组织的裂纹偏折更大，粗糙度诱发闭合效应更强，因而裂纹扩展较幔。
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