A simulated coarse-grained heat affected zone microstructure formation mechanism is established in high strength low alloy steels using electron backscatter diffraction (EBSD). The governing effect of dispersion and ratios between different types of ferritic structural constituents on variation in impact strength is demonstrated. It is assumed from results of simulating a heat affected zone coarse-grained area that a reduction in welding energy input leads to a shift in ductile-brittle transition temperature towards a lower temperature.

中文翻译：

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热影响区粗晶区模拟对高强度低合金钢焊接接头韧性的影响

使用电子背散射衍射 (EBSD) 在高强度低合金钢中建立模拟粗晶热影响区微观结构形成机制。证明了不同类型铁素体结构成分之间的分散和比例对冲击强度变化的控制作用。根据模拟热影响区粗晶区的结果，假设焊接能量输入的减少导致韧脆转变温度向较低温度移动。