研究了添加微量元素(Ti、V、Zr、Nb)低合金高强度钢焊接热影响区(HAZ)晶内针状铁素体(IGF)的形成机理,并采用TEM和EDS观察和分析HAZ中晶内针状铁素体形成核心的化学成分和结构及核心周边锰含量变化.结果表明:添加微量元素可有效阻止HAZ晶粒粗大化,抑制离异珠光体出现;HAZ中以ZrO2氧化物为核心形成的复合化合物ZrO2+(Zr,Ti)2O5+MnS+V(C、N)+NbN能有效促进IGF形成;复合化合物周围的MnS造成复合化合物周围约40 nm的Mn贫化区,Mn贫化区锰含量大小与生成IGF量有良好对应关系.
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