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％.
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