Abstract

The location of the V-notch in a weld metal (WM) can have a significant influence on the impact toughness of a 9 weight percent (9 pct) Cr-CrMoV dissimilar welded joint. The specimens with the V-notch at position I, which was parallel to the filling direction, presented small fluctuations in the impact toughness, while relatively larger fluctuations occurred in the specimens with the V-notches parallel to the welding direction (position II). Several equiaxed grain zones favorable to hindering the crack propagation could ensure less fluctuation in the impact toughness. In contrast, the columnar and equiaxed grain zones could be clearly distinguished in the specimens with the V-notches at position II. The differences in the crack propagation paths and tip locations of the V-notches are regarded as the main factors causing the fluctuations in the impact toughness.

中文翻译：

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V型缺口位置在9 Pct Cr-CrMoV异种焊接接头冲击韧性中的作用

摘要

V型缺口在焊接金属（WM）中的位置可能会对9％（9 pct）的Cr-CrMoV异种焊接接头的冲击韧性产生重大影响。V形缺口位于与填充方向平行的位置I的试样，其冲击韧性波动较小，而V形缺口与焊接方向平行的试样（位置II）的波动较大。几个有利于阻碍裂纹扩展的等轴晶区可以确保冲击韧性的波动较小。相反，在带有II位置V形缺口的样品中，可以清楚地区分柱状和等轴晶区域。