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在传统的控制轧制基础上,直接淬火+回火工艺得到了Nb-Ti低合金钢的最优综合力学性能,即回火温度为200℃时,抗拉强度为1 730 MPa,屈服强度为1 400 MPa,-40℃冲击功为43 J。低温回火,板条内析出碳化物。随回火温度升高,实验钢韧性先降低,形成回火脆性线性,再升高,逐渐形成球形渗碳体,600℃时最多。
Based on the traditional control rolling, the optimal mechanical properties of Nb-Ti low-alloy steel were obtained by direct quenching and tempering process, that is, the tensile strength was 1 730 MPa and the yield strength was 1 400 MPa, -40 ℃ impact energy is 43 J. Low temperature tempering, carbide precipitation within the slats. With the tempering temperature increased, the toughness of the experimental steel first decreased, forming a temper brittleness linear, and then increased, and gradually form a spherical cementite, 600 ° C up.