【摘要】 研究了淬火温度和低温回火温度对Cr-Mo系马氏体耐磨钢组织及力学性能的影响。结果表明，随着淬火温度的升高，试验钢回火后的回火马氏体板条明显粗化，强度和塑韧性有所降低。1060℃淬火+回火下的硬度高于860℃淬火+回火，这是因为淬火温度高使固溶的合金元素含量更多，拥有更好的固溶强化效果。当淬火温度为860℃时，随回火温度升高，强度和韧性先增加后降低，200℃时达到最高，其抗拉强度和-40℃冲击吸收能量分别为1607 MPa和43.9 J,280℃回火时强塑积降至最低，继续提高回火温度至320℃,强度和韧性略有回升。当淬火温度为1060℃时，钢的强度随回火温度升高而降低，韧性随回火温度升高先降低后略回升，160℃回火时综合力学性能最好，抗拉强度和-40℃冲击吸收能量分别为1494 MPa和45.4 J。更多还原

【Abstract】 Effects of quenching temperature and low temperature tempering temperature on microstructure and mechanical properties of a Cr-Mo wear-resistant steel were investigated. The results show that the lath of tempering martensite of the tested steel after tempering is coarsened with the increase of quenching temperature, leading to the decrease of the strength, ductility and toughness. The hardness of the steel after quenching at 1060 ℃ and tempering is higher than that of quenching at 860 ℃ and tempering, which is due to the higher solution strengthening caused by more solution element during quenching isothermal stage. When the quenching temperature is 860 ℃, the strength and toughness first increase and then decreases with the increase of tempering temperature. The optimal tensile strength and impact absorbed energy at-40 ℃ are obtained when tempered at 200 ℃, which are 1607 MPa and 43.9 J, respectively, while the product of strength and elongation decreases to the lowest grade when tempered at 280 ℃. With the tempering temperature further increasing, the strength and toughness increase slightly. When the quenching temperature is 1060 ℃, the strength gradually decreases with the tempering temperature increasing, while the toughness first decreases and then has a little increment. The optimal tensile strength and impact absorbed energy at-40 ℃ are obtained when tempered at 160 ℃, which are 1494 MPa and 45.4 J, respectively.更多还原