Effect of tempering temperature on microstructure and properties of V-N microalloyed cast steel

doi:10.13251/j.issn.0254-6051.2022.10.004

Abstract

Abstract: Two microalloyed cast steels with different V contents were prepared in a vacuum melting furnace and heat treated by normalizing, quenching and tempering at different temperatures. Effect of tempering temperature on microstructure and properties of the two tested steels with different V contents was studied. The results show that the effect of V content promotes the carbonitride precipitates and reduces the solid solubility of C and N elements in the martensite, resulting in the improvement of impact absorbed energy. When tempering temperature is below 400 ℃, the dominant strengthening mechanism is solution strengthening. When tempering temperature is above 400 ℃, the dominant strengthening mechanism is precipitation hardening. The increase of V content also promotes the carbonitride precipitates shape translating from short rod to granular, and the brittleness of high temperature tempering is improved.

Key words: microalloying, tempering, hardness, impact absorbed energy

CLC Number:

TG142.1

Wang Xiaodong, Chen Yunbo, Zuo Lingli, Mao Feng, Zhang Cheng, Chen Chong, Wang Shu, Cui Hailin. Effect of tempering temperature on microstructure and properties of V-N microalloyed cast steel[J]. Heat Treatment of Metals, 2022, 47(10): 19-23.

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