Effect of spheroidizing annealing on microstructure and mechanical properties of high-carbon martensitic stainless steel 8Cr13MoV

doi:10.13251/j.issn.0254-6051.2020.12.008

Abstract

Abstract: In order to optimize the spheroidizing heat treatment process of high carbon martensitic stainless steel 8Cr13MoV and improve its cold working properties after annealing, the effects of austenitizing time and cooling rate on the spheroidization effect of 8Cr13MoV steel during the spheroidizing annealing process were investigated by microstructure analysis and tensile mechanical test. The obtained results indicate that with the increase of austenite holding time, the number of fine carbides decreases, while the number of sorbite increases. The hardness of the steel decreases first and then increases, and the elongation increases. The number of fine carbides and sorbite, the hardness and strength of the steel increase with the cooling rate increasing, while the elongation decreases. Comprehensive comparison shows that the comprehensive mechanical properties of the 8Cr13MoV steel are preferable when the austenitic holding time is 90 min, and the cooling rate should be controlled within 25 ℃·h^-1. Compared with holding time, the influence of cooling rate on the mechanical properties is more remarkable.

Key words: spheroidizing annealing, carbide, sorbite, martensitic stainless steel, cooling rate

CLC Number:

TG156.2

Yu Wentao, Li Jing, Xu Meng, Shi Chengbin. Effect of spheroidizing annealing on microstructure and mechanical properties of high-carbon martensitic stainless steel 8Cr13MoV[J]. Heat Treatment of Metals, 2020, 45(12): 41-47.

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