Phase transformation and mechanical properties of 5Cr2NiMoVSi die steel

doi:10.13251/j.issn.0254-6051.2022.03.035

Abstract

Abstract: Thermal expansion curves of 5Cr2NiMoVSi die steel under different cooling conditions was measured by means of Formastor-FⅡ full automatic transformation measuring apparatus. Combining microstructure and hardness results, the phase transformation characteristics of the 5Cr2NiMoVSi die steel was analyzed and the continuous cooling transformation curves were gained. The effect of tempering parameter on mechanical properties of the steel was studied. The results show that the supercooled austenite of 5Cr2NiMoVSi steel has good stability, and the continuous cooling transformation curve shifts to the right greatly. The hardness of materials has a great correlation with the cooling rate, and the hardness increases rapidly with the increase of cooling rate. The critical cooling rate of the steel is 0.4 ℃/s,and the martensitic hardness is basically maintained above 640 HV. When tempered between 550 ℃ and 590 ℃, the tensile strength of the material is not less than 1628 MPa, indicating good tempering stability.

Key words: 5Cr2NiMoVSi die steel, continuous cooling transformation curves, martensite, tempering temperature, mechanical properties

CLC Number:

TG142.1

Pang Qinghai, Lang Qingbin, He Chunjing, Wang Jiuhua, Yuan Yasha. Phase transformation and mechanical properties of 5Cr2NiMoVSi die steel[J]. Heat Treatment of Metals, 2022, 47(3): 186-190.

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