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本文采用膨胀式自动相变仪Formastor—F配合金相显微分析,测定了不同硅含量的高强度低合金冷作模具钢6CrNiMnSiMoV(代号GD钢)的过冷奥氏体等温转变曲线(TTT),并根据TTT制定了三种钢的等温淬火处理工艺,测定了三种钢等温淬火后的各项力学性能。结果表明,提高钢的硅含量,钢的加热相变点上升,Ms稍有下降;硅缩短等温珠光体转变孕育期,并使珠光体转变线上移;硅抑制等温贝氏体转变,使贝氏体转变线下移;GD钢等温淬火后获得马氏体-下贝氏体组织,1.82％Si的GD_4钢等温淬火后具有最佳的力学性能。
In this paper, Formastor-F with metallurgical phase analysis was used to measure the supercooled austenite isothermal transformation curve (TTT) of 6CrNiMnSiMoV (GD steel) with different silicon content. According to TTT, three kinds of steel areothermal quenching process were developed, the mechanical properties of the three kinds of steel after isothermal quenching were measured. The results show that increasing the silicon content in the steel increases the heating transformation point of the steel and Ms slightly decreases; silicon shortens the incubation period of the isothermal pearlite transformation and shifts the pearlite transformation upwards; silicon inhibits isothermal bainite transformation, The martensitic-lower bainite structure was obtained after the austempering of GD steel. GD82 steel with 1.82% Si had the best mechanical properties after isothermal quenching.