合金钢淬火-配分工艺研究进展

doi:10.13228/j.boyuan.issn0449-749x.20210732

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Abstract With the continuous development of metallurgy, machinery and other fields in China, the requirements for the properties of iron and steel materials are becoming more and more strict. Automotive steel is required not only to lose weight but also to have high enough impact resistance to ensure safety. Wear-resistant materials should have not only strong hardness but also good toughness. The Quenching and Partitioning (Q&P) process of alloy steel was proposed by Professor Speer J G of the United States in 2003 inspired by Trip steel. The ultimate goal is to obtain a certain amount of soft phase retained austenite on the hard phase matrix, so as to improve the plasticity and toughness of the steel. Martensite and bainite ensure strength and retained austenite can improve toughness, and the combination of the two phases has good comprehensive mechanical properties. Different from the traditional process of quenching tempering (QT) inhibiting carbide precipitation, the carbon in the steel is not decomposed into carbide, but is rediffused to austenite in the process of heat preservation, which improves the stability of austenite. Q&P steel has the characteristics of low cost, good performance and relatively simple process, when initially applied to automobile high strength steel, it can greatly reduce the weight of automobile, improve anti-collision ability and reduce the degree of deformation. In succession, some researchers have applied Q&P process to wear-resistant materials, and found that the toughness can be greatly improved with little or no loss of wear resistance. In order to further improve the properties, many researchers at home and abroad have done a lot of research. In the optimization of heat treatment process, it is found that the parameters such as austenitizing temperature, quenching process and partitioning process have great influence on the microstructure and properties of Q&P steel. In terms of alloying element control, not only conventional alloy elements such as C, Mn and Si have important influence on the properties of Q&P steel, micro alloying elements such as Nb and Mo also have great influence on the microstructure and properties of Q&P steel. The proposal and development of Q&P process were described mainly, the research status at home and abroad, and the application of Q&P process were discribed mainly. Finally, the future development of Q&P process is prospected and summarized.

Key words： alloy steel Q&P process partitioning strengthening and toughening wear-resistance

Received: 29 November 2021

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	SI Zhi-wang
	FU Han-guang

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SI Zhi-wang,FU Han-guang. Research progress of quenching and partitioning process for alloy steel[J]. Iron and Steel, 2022, 57(6): 120-131.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210732 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I6/120

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