Effect of vanadium on microstructure and mechanical properties of nitrogen-containing martensitic stainless steel

doi:10.13251/j.issn.0254-6051.2023.03.039

Abstract

Abstract: In order to improve the service performance of nitrogen-containing martensitic stainless steel at high temperature, two tested steels (one with 0.12%V (mass fraction) and one without V) were designed. The effect of adding a trace amount of vanadium on microstructure and mechanical properties of the nitrogen-containing martensitic stainless steel was studied by impact tester, tensile tester, hardness tester, Thermo-Calc software, OM, SEM and TEM. The results show that the hardness of nitrogen bearing martensitic stainless steel with 0.12%V tempered at 450-550 ℃ is 0.6-1.9 HRC higher and the impact absorbed energy is 1.2-3.8 J higher than that without V. After quenching at 1050 ℃, cryogenic treatment at -73 ℃ and tempering at 530 ℃, the plasticity and toughness of the 0.12%V steel are greatly improved, the fracture mode changes to ductile-brittle mixed fracture, and the prior austenite grain size decreases from 16.48 μm to 11.12 μm, the types and distribution of the secondary phases change from the short rod-like coarse carbides distributed as broken chains along the prior austenite grain boundary into dispersively distributed spherical carbides and carbonitrides. Thus the strength and ductility of the nitrogen bearing martensitic stainless steel are all improved by refining grains and uniformly distributing spherical carbides and carbonitrides.

Key words: nitrogen-containing martensitic stainless steel, vanadium, brittle fracture, grain refinement, properties

CLC Number:

TG156

Cao Xin, Li Quan, Yang Yinhui. Effect of vanadium on microstructure and mechanical properties of nitrogen-containing martensitic stainless steel[J]. Heat Treatment of Metals, 2023, 48(3): 236-241.

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