Effect of Cooling Rate and Partitioning Temperature on Microstructure and Mechanical Properties of Medium-carbon Steel During Quenching and Partitioning
HUANG Wei1,2, OU Meigui1,2,*, LIANG Yilong1,2, MA Yongtao3
1 College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China 2 Guizhou Key Laboratory of Material Structure and Strength, Guizhou University, Guiyang 550025, China 3 CRRC Guiyang Vehicle Co., Ltd., Guiyang 550025, China
Abstract: Q&P process is under control of both quenching and partitioning. Quenching is help to obtain high-strength martensitic matrix, while partitioning is help to stabilize residual austenite and improve the Q&P steel’s plasticity. Adopting quenchants with different cooling rates such as oil, 13% PAG, and HX-2000, the effect of quenching rates on partitioning temperature-dependent microstructure and mechanical properties of medium-carbon steel was discussed by quenching tests. Meanwhile, the effect of partitioning temperature on carbon partitioning was also stu-died. The findings show that the carbon non-uniformity between martensite and residual austenite subsides during high temperature partitioning, which could promote the diffusion of carbon from martensite to residual austenite, stabilize residual austenite and improve the elongation of medium carbon steel. Besides, rapid quenching can obtain high carbon martensite, which is conducive to promoting the carbon diffusion of martensite to residual austenite and improving the level of carbon partitioning during partitioning process. With the increase of quenching rate, the effective grain size of martensite decreases, the martensite structure is refined and the dislocation density increases, resulting in excellent strength and plasticity of medium carbon steel. Under quenching with 13% PAG and a partitioning temperature of 320 ℃, the experimental steel obtains a good match of strength and plasticity with a elongation of about 10.34%—10.37% and the strength plastic product can of 18.94—19.21 GPa%.
黄玮, 欧梅桂, 梁益龙, 马永涛. Q&P工艺中淬火冷速和分配温度对中碳钢显微组织和力学性能的影响[J]. 材料导报, 2025, 39(11): 24050239-6.
HUANG Wei, OU Meigui, LIANG Yilong, MA Yongtao. Effect of Cooling Rate and Partitioning Temperature on Microstructure and Mechanical Properties of Medium-carbon Steel During Quenching and Partitioning. Materials Reports, 2025, 39(11): 24050239-6.
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2025, Vol. 39 
