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研究结果表明 ,通过向焊缝金属过渡微量的Ti B和稀土元素 ,可以使焊缝获得细小、均匀的针状铁素体组织 .通过透射电镜观察发现 :焊缝中合金元素如果能形成细小、难溶的非金属夹杂物 ,就可以成为针状铁素体的形核核心 ;Ti能形成细小、难溶而弥散分布的化合物 (TiO )质点 ,因而对针状铁素体的形核更为有利 ;针状铁素体由许多亚结构组成 .
The results show that microstructure and microstructure of acicular ferrite can be obtained by the transition of trace TiB and rare earth elements to the weld metal.It can be observed by TEM that if the alloying elements in the weld are fine, The insoluble and non-metallic inclusions can become the core of acicular ferrite. Ti can form tiny, sparingly dispersed and disperse compound (TiO) particles, so the nucleation of acicular ferrite is more Favorable; acicular ferrite consists of many substructures.