Effect of austempering on microstructure and mechanical properties of high vanadium wear-resistant alloy

doi:10.13251/j.issn.0254-6051.2024.04.020

Abstract

Abstract: The effect of different austempering temperatures on the microstructure and mechanical properties of high vanadium wear-resistant alloy prepared by sand-casting was investigated. The results show that the alloy obtains nano-bainite matrix structure after austempering at 200-300 ℃, which is composed of bainite-ferrite lath and retained austenite in film/block form. The carbides exhibit no significant changes, whereas the hardness and impact absorbed energy significant improve compared to the as-cast alloy. Lowering the austempering temperature promotes the transformation of austenite to bainite and refines the bainite structure. As the austempering temperature decreases from 300 ℃ to 200 ℃, the thickness of bainitic ferrite lath and austenite film decreases from 50-200 nm and 35-185 nm to 20-100 nm and 20-125 nm, respectively, and the alloy hardness increases from 53.3 HRC to 59.3 HRC, while the impact absorbed energy shows a slight decrease. In comparison to the alloy with a tempered martensite matrix, the bainite matrix alloy exhibits a lower hardness but a significantly improved impact absorbed energy. After austempering at 200 ℃, the alloy hardness is 1.7% lower than that of the tempered martensite matrix alloy, while its impact absorbed energy is 60% higher.

Key words: austempering, high vanadium wear-resistant alloy, nano-bainite, mechanical properties

CLC Number:

TG113.1

Xie Hongshen, Li Ming, Leng Wanqing, Diao Xiaogang, Li Zhou, Xu Liujie. Effect of austempering on microstructure and mechanical properties of high vanadium wear-resistant alloy[J]. Heat Treatment of Metals, 2024, 49(4): 123-131.

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