采用金属包埋切片微米-纳米表征法和电子背散射衍射技术分别研究了焊缝金属中针状铁素体形核夹杂和联锁组织特征.结果表明,由于Mn元素扩散到夹杂物内部使得周围形成贫Mn区,诱发针状铁素体在复合夹杂物上形核.同时针状铁素体还可以在已经形成的铁素体表面激发形核;铁素体生长过程中同原奥氏体保持固定取向关系;铁素体相互之间发生硬碰撞和交错现象;这些因素共同形成针状铁素体联锁组织.这种细小有效晶粒尺寸的针状铁素体联锁组织具有良好的强韧性匹配.
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