Austempering preparation of high silicon high vanadium high speed steel with bainite matrix and its microstructure characteristics

doi:10.13251/j.issn.0254-6051.2023.08.014

Abstract

Abstract: After preparation by sand casting, the effect of austempering temperature on microstructure transformation of nano-bainite in a high silicon and high vanadium high speed steel was studied. The results show that by increasing the silicon content to 2.14%(mass fraction), the precipitation of cementite in bainitic ferrite can be inhibited, and the nano-bainite matrix structure can be obtained. With the decrease of austempering temperature, the bainite structure is refined. When the austempering temperature is decreased from 300 ℃ to 250 ℃, the average thickness of bainitic ferrite and thin film retained austenite decreases by 30% and 27%, respectively. While from 250 ℃ to 200 ℃, the microstructure thicknesses do not decrease. The bainite transformation amount increases and the transformation time is prolonged with the decrease of austempering temperature. The content of retained austenite decreases by 34.7% and 60.9%, respectively, when the austempering temperature decreases from 300 ℃ to 250 ℃ and 200 ℃, and the bainite transformation time increases from 84 h at 300 ℃ to more than 96 h at 200 ℃.

Key words: high vanadium high speed steel, high silicon, austempering temperature, nano-bainite

CLC Number:

TG113.1

Zhang Zhiyong, Shi Ruxing, Yin Litao, Pang Qinghai, Leng Wanqing, Xu Liujie. Austempering preparation of high silicon high vanadium high speed steel with bainite matrix and its microstructure characteristics[J]. Heat Treatment of Metals, 2023, 48(8): 87-93.

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