【摘要】 针对低合金耐磨钢ZG30CrMnSiMoVTi经淬火-配分(Q-P)处理后组织分布不均匀的问题，采用水-空交替循环控时淬火(ATQ)工艺进行热处理，通过模拟计算分析了不同条件下试验钢的冷却曲线，确定了ATQ处理工艺细节。借助OM、SEM、EDS、洛氏硬度计、冲击试验机和拉伸试验机对不同循环次数下ATQ处理试验钢的微观组织和力学性能进行了研究。结果表明，经过ATQ处理的试验钢中出现了大量的马氏体和少量的贝氏体组织。经过ATQ循环3次的试验钢的组织分布最为均匀，贝氏体含量最多，而且力学性能最优。ATQ循环3次的试验钢的平均洛氏硬度为46.45 HRC,冲击吸收能量为29.1 J,抗拉强度为1551.69 MPa,屈服强度为1293.07 MPa,断后伸长率为12.6%。更多还原

【Abstract】 To address the issue of uneven microstructure distribution in low alloy wear-resistant ZG30CrMnSiMoVTi steel after quenching and partitioning(Q-P), the water-air alternately timed quenching(ATQ) process was adopted. The cooling curves of the tested steel under different conditions were simulated and analyzed to determine the details of the ATQ process. The microstructure and mechanical properties of the tested steel after ATQ for different cycles were studied by means of optical microscope(OM), scanning electron microscope(SEM), energy-dispersive spectroscopy(EDS), Rockwell hardness tester, impact testing machine and tensile testing machine. The results indicate that a large amount of martensite and a small amount of bainite structure appear in the tested steel ATQ treated. Among all the tested steels, the one ATQ treated thrice has the most uniform microstructure distribution, the highest bainite content and the best mechanical properties, with the average Rockwell hardness of 46.45 HRC, impact absorbed energy of 29.1 J, tensile strength of 1551.69 MPa, yield strength of 1293.07 MPa and elongation after fracture of 12.6%.更多还原