Effect of a novel heat treatment process on microstructure and mechanical properties of medium carbon steel

PENG Yan; LIU Cai-yi; WANG Ning-ning; KONG Ling

doi:10.13228/j.boyuan.issn0449-749x.20200232

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Iron and Steel ›› 2021, Vol. 56 ›› Issue (1) : 85-90. DOI: 10.13228/j.boyuan.issn0449-749x.20200232

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Effect of a novel heat treatment process on microstructure and mechanical properties of medium carbon steel

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Abstract

To improve the strength and plasticity of high strength steel, based on the traditional quenching-partitioning-tempering (Q-P-T) process a novel deforming-quenching-partitioning-tempering (D-Q-P-T) process was proposed by a medium carbon steel. The microstructure evolution and mechanical property were investigated based on the SEM,TEM,X-ray diffraction characteristic techniques and mechanical properties tests. The mechanism of quenching-partitioning-tempering process to improve the strength plasticity of steel were discussed. The deforming-quenching-partitioning-tempering process was used to obtain the lath like martensite and retained austenite with high dislocation density,which realizes the design idea of multiphase structure of steel. Compared with the traditional quenching-partitioning-tempering process,the deforming-quenching-partitioning-tempering process can increase the tensile strength by 58 MPa and the elongation by 5%. The research is of great significance for realizing automobile lightweight and widening the application field of high strength steel.

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deforming-quenching-partitioning-tempering / microstructure / mechanical property / product of strength and ductility / process

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PENG Yan, LIU Cai-yi, WANG Ning-ning, et al. Effect of a novel heat treatment process on microstructure and mechanical properties of medium carbon steel[J]. Iron and Steel, 2021, 56(1): 85-90 https://doi.org/10.13228/j.boyuan.issn0449-749x.20200232

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