Comparison and analysis of cooling transformation for 2.25Cr-1Mo and 2.25Cr-1Mo-0.25V steels

doi:10.13251/j.issn.0254-6051.2020.04.010

Abstract

Abstract: Cooling transformations of 2.25Cr-1Mo and 2.25Cr-1Mo-0.25V steels were researched by phase change instrument, OM and SEM, and the effect of V on the cooling transformation was analyzed. The results show that compared with the CCT curves of 2.25Cr-1Mo steel, both the ferrite and the bainite transformation zones of the CCT curves for 2.25Cr-1Mo-0.25V steel shift right. Pearlite transformation zone is unable to be observed under existing test conditions. Adding V into 2.25Cr-1Mo steel improves the hardenability. 2.25Cr-1Mo-0.25V steel can transform into martensite partially under 48 000 ℃/h cooling rate. V can refine microstructure of the steel, the microstructure of 2.25Cr-1Mo-0.25V steel is finer than that of 2.25Cr-1Mo steel under 800 ℃/h cooling rate.

Key words: 2.25Cr-1Mo steel, 2.25Cr-1Mo-0.25V steel, cooling transformation, CCT curves, microstructure

CLC Number:

TG151.2

Hou Jingchao, Li Jie, Wu Yanyang, Yuan Jincheng, Yin Weijiang, Niu Hongxing. Comparison and analysis of cooling transformation for 2.25Cr-1Mo and 2.25Cr-1Mo-0.25V steels[J]. Heat Treatment of Metals, 2020, 45(4): 51-54.

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