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HQ80C鋼性能與組織的定量關系

Structure-Property Relationships in a Heat-Treated Weldable Steel

  • 摘要: 研究了一種Cr-Ni-Mo-V-Ti-B多元合金化、強度高于785MPa的可焊結構鋼(HQ80C)淬火態和400~700℃回火態顯微組織與拉伸性能及沖擊性能之間的定量關系。發現鋼的韌脆轉化溫度(50%FATT)與馬氏體板條束截線長度呈線性相關;建立了調質態鋼的屈服強度計算公式。回火溫度范圍為500~700℃時理論計算值與實測值相對偏差均小于3%。

     

    Abstract: A785MPa-grade weldable HSLA steel (HQ80C) with Cr, Ni, Mo, V, Ti, and B has been experimentally studied to determine quantitative relationships between properties (strength and toughness) and microstructures. It has been found that the ductile-brittle transition temperature (50%FATT) varies linearly with the mean intercept of martensitic packets. An empiric equation has been established to predict the yield strength of the as quenched and tempered steel; the relative deviation of the predicted yield strength values from the experimental ones are all less than 3% when the steel was tempred at 500 to 700℃.

     

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