结果表明，细小弥散的第二相粒子能有效地阻碍焊接热影响区粗晶区的原奥氏体晶粒长大，改善该区域的韧性。
The results show that the dispersed second phase particles can effectively retard the growth of austenite grain in the CGHAZ, and improve the toughness.
通过电镜分析，发现在马氏体基体上有一定数量的弥散的第二相存在是引起积屑瘤产生的冶金因素。
By electronic microscope analysis, it is found that there is a certain amount of second dispersed phase in the martensite matrix which is the metallurgical factor of forming built-up edge.
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