采用热模拟技术,EBSD技术和透射电子显微镜对镁处理高钢级管线钢的焊接热影响区(HAZ)晶内铁素体(IGF)的形核现象和机制进行了试验研究.结果表明:镁处理钢中形成大量的Al、Ti、Mg复合氧化物夹杂,其颗粒大小为0.5～3μm.在粗晶热影响区(CGHAZ)中,含Mg复合氧化物具有促进晶内针状铁素体形核的能力.对Mg处理高钢级管线钢焊接热影响区晶内铁素体的形核机制进行了探讨.
The phenomena and mechanism of nucleation of intra-granular ferrite in welding heat affected zone of Mg treated high-grade pipeline steel was studied by using thermal simulation, EBSD and transmission electron micro-scope. The results indicate that the inclusions in Mg treated steel are Al, Ti, Mg composite oxides with size in the range of 0.5-3 μm. Mg composite oxides could promote the formation of acicular ferrite in coarse grain heat affected zone. The nucleation mechanisms of intra-granular ferrite in Mg treated high-grade pipeline steel was discussed.
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