Effect of spheroidizing temperature on microstructure and properties of4Cr5Mo2V hot work die steel

doi:10.13251/j.issn.0254-6051.2021.03.009

Abstract

Abstract: Metallographic microscope and scanning electron microscope were used to observe the microstructure change of 4Cr5Mo2V steel at different spheroidizing temperatures. The image processing software Image Pro Plus was used to quantitatively analyze the number, average particle size and volume fraction of carbides. Then the influence of annealing spheroidizing on the mechanical properties of the quenched and tempered 4Cr5Mo2V steel was studied. The results show that when the spheroidizing temperature is 820-900 ℃, the number of carbides per unit area, volume fraction and average particle size are between (10.0-14.0)×10⁸ cm^-2, 8.0%-10.0% and 0.30-0.43 μm, respectively. When the spheroidizing temperature is 840 ℃, the inhomogeneous annealing structure can be effectively eliminated, the average particle size of the carbide is 0.31 μm, and the impact absorbed energy at room temperature is 392 J, with good mechanical properties.

Key words: 4Cr5Mo2V hot work die steel, spheroidizing temperature, annealed structure, carbide

CLC Number:

TG156.2

Chang Yong, Li Li, Wu Shaojun, Zuo Pengpeng, Wu Xiaochun. Effect of spheroidizing temperature on microstructure and properties of4Cr5Mo2V hot work die steel[J]. Heat Treatment of Metals, 2021, 46(3): 46-50.

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