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利用焊接粗晶区连续冷却淬火方法,对比分析了钛处理钢和普通C-Mn钢焊接粗晶区连续冷却不同阶段的相变组织,研究了铁素体相变规律。结果表明,C-Mn钢焊接粗晶区主要为晶界铁素体+魏氏组织铁素体;钛处理钢焊接粗晶区主要为晶界铁素体+魏氏组织铁素体+晶内铁素体组织。在钛处理钢中,晶界铁素体、魏氏组织铁素体和晶内铁素体的相变开始温度相同,但各自长大的动力学条件不同。当晶内铁素体和魏氏组织铁素体竞争发生相变时,晶内铁素体在晶内弥散分布氧化物夹杂上的非均质形核抑制了魏氏组织铁素体向晶内的长大。
By means of continuous cooling and quenching method in the welding coarse-grained area, the phase transformation microstructure of the welded coarse-grained area of the titanium-treated steel and the normal C-Mn steel during continuous cooling was comparatively analyzed, and the ferrite transformation law was studied. The results show that the grain boundaries are mainly grain boundary ferrite and Widmanstatten ferrite in the welding coarse grain region of C-Mn steel; the grain boundary ferrite and Westend tissue ferrite + Ferrite. In Ti-treated steel, the starting temperatures of grain boundary ferrite, Widmanstatten ferrite and intragranular ferrite are the same, but the kinetic conditions of their growth are different. When the intragranular ferrite and Wei’s tissue ferrite compete for phase transition, intragranular ferrite dispersed within the grain heterogeneity of oxide inclusions on the heterogeneous nucleation inhibits the Wei’s tissue ferrite into the crystal Grow up.