Effect of tempering temperature on precipitation and mechanical properties of Ti-V-Mo microalloyed martensitic steel

doi:10.13251/j.issn.0254-6051.2021.12.009

Abstract

Abstract: Microstructure and precipitates of Ti-V-Mo microalloyed martensitic steel after quenching and tempering at different temperatures (550,600,650 ℃) for 1 h were characterized by microanalysis and physicochemical phase analysis, and the strengthening components were calculated. The results show that the steel has the best comprehensive mechanical properties when tempered at 600 ℃: the tensile strength is 1298 MPa, the yield strength is 1286 MPa and the elongation is 14%. The calculation results of strengthening component show that precipitation strengthening and fine grain strengthening are the main strengthening mechanism, accounting for about 40% and 30% of the total strength. And precipitation strengthening component σ_p is 517 MPa, provided by (Ti, V, Mo) C particles (mass fraction 22%) below 5 nm. When the tempering temperature increase from 550 ℃ to 600 ℃, the tensile strength and yield strength increase, but the elongation change little. The main reason is that as σ_P contributes to the yield strength increasingly, the plasticity is improved with the strength increasing.

Key words: Ti-V-Mo microalloyed, martensitic steel, tempering temperature, precipitation strengthening, mechanical properties

CLC Number:

TG156.5

Han Rong, Liu Hongxi, Yu Wenchao, Wang Maoqiu, Shi Jie. Effect of tempering temperature on precipitation and mechanical properties of Ti-V-Mo microalloyed martensitic steel[J]. Heat Treatment of Metals, 2021, 46(12): 53-60.

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