Effects of NiAl precipitation on the stability of retained austenite and mechanical properties of a quenching-partitioning-tempering treated medium-manganese steel

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Abstract

The effect of NiAl-type nanoparticles on the austenite stability was investigated during quenching-partitioning- tempering (QPT) processes in a cold rolled medium-manganese steel. A good combination of ductility (total elongation: 37.9%) and strength (yield strength: 995 MPa/ultimate tensile strength: 1 260 MPa) is obtained after the first step of partitioning treatment at 630°C/1 h (P630) due to appropriate austenite stability and multiple strengthening mechanisms. Moreover, the yield strength and ductility increase further after the second step of tempering treatment at 500°C/2 h by about 113 MPa and 8.5% respectively. It was found that high density of intragranular NiAl-type nanoparticles precipitated during tempering improve the ductility from two aspects. NiAl-type nanoparticles could provide a harder and work-hardenable martensite matrix, which is beneficial for the stability and sustainability of the retained austenite during tensile deformations.

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Liu, H., Xu, Y., Li, W., Min, N., & Jin, X. (2021). Effects of NiAl precipitation on the stability of retained austenite and mechanical properties of a quenching-partitioning-tempering treated medium-manganese steel. ISIJ International, 61(1), 387–395. https://doi.org/10.2355/isijinternational.ISIJINT-2020-185

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