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研究了一种Cr-Ni-Mo-V-Ti-B多元合金化、强度高于785MPa的可焊结构钢(HQ80C)淬火态和400～700℃回火态显微组织与拉伸性能及冲击性能之间的定量关系。发现钢的韧脆转化温度(50％FATT)与马氏体板条束截线长度呈线性相关;建立了调质态钢的屈服强度计算公式。回火温度范围为500～700℃时理论计算值与实测值相对偏差均小于3％。
The effects of quenching temperature and tempering microstructure, tensile property and impact on the weldability of structural steel (HQ80C) with Cr-Ni-Mo-V-Ti-B multi-alloying and strength higher than 785MPa at 400-700 ℃ The quantitative relationship between performance. It was found that the ductile-brittle transition temperature (50% FATT) of steel was linearly correlated with the length of martensite laths and the yield strength formula was established. Tempering temperature range of 500 ~ 700 ℃ when the theoretical calculated value and the measured value of the relative deviation of less than 3%.