Effect of intercritical warm-rolling reduction ratio on microstructure and  properties of medium manganese steel treated by quenching and partitioning

doi:10.13251/j.issn.0254-6051.2022.03.005

Abstract

Abstract: Microstructure, carbide precipitation, volume fraction of retained austenite and C content, and mechanical properties of 0.1C-7.2Mn steel with intercritical warm-rolling quenching and partitioning treatment were studied by means of SEM, TEM, XRD and room temperature tensile test. The results show that the martensite lath of specimen after quenching and partitioning by intercritical warm-rolling is refined and parallel to the rolling direction gradually with the increase of warm-rolling reduction ratio. The microstructure of the specimen is composed of martensite and retained austenite, and carbides are precipitated after intercritical warm-rolling quenching and partitioning treatment.With the increase of warm-rolling reduction ratio, the average size of carbide coarsens, the volume fraction of retained austenite gradually increases, and the C content in retained austenite, the yield strength and tensile strength first increase and then decrease, but the elongation decreases first and then increases. When the reduction ratio of warm-rolling is 80%, the product of strength and elongation reaches the maximum of 31.50 GPa·%.

Key words: medium-manganese steel, intercritical warm-rolling, reduction ratio, retained austenite, product of strength and elongation

CLC Number:

TG142.4

Chen Liansheng, Fang Ning, Cao Zhongqian, Yang Zixuan, Li Hongbin, Pan Hongbo, Tian Yaqiang. Effect of intercritical warm-rolling reduction ratio on microstructure and properties of medium manganese steel treated by quenching and partitioning[J]. Heat Treatment of Metals, 2022, 47(3): 28-33.

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Effect of intercritical warm-rolling reduction ratio on microstructure and properties of medium manganese steel treated by quenching and partitioning

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