Jominy end quenching characteristics of 52CrMoV4 leaf spring steel

doi:10.13251/j.issn.0254-6051.2024.04.003

Abstract

Abstract: Jominy end quenching test were carried out on 52CrMoV4 large specification leaf spring steel to investigate the effects of normalizing pretreatment at 900 ℃ for 1 h and austenitizing at 850 ℃ and 900 ℃ on Jominy end quenching characteristic of the 52CrMoV4 leaf spring steel. The results show that the end-quenching hardness of hot-rolled steel after austenitizing at 850 ℃ is lower and banded microstructure is more obvious and the end-quenching curve fluctuates greatly, which can reflect the uniformity of chemical composition distribution to some degree. Hot-rolled steel austenitized at 900 ℃ can reach higher hardness and normalizing before quenching can stabilize the overall hardness of 52CrMoV4 leaf spring steel. During 52CrMoV4 steel leaf spring manufacturing process, 900 ℃ austenitizing temperature is adopted to acquire higher hardness around 60 HRC, displaying better quenching properties.

Key words: leaf spring steel, hardenability, microstructure uniformity, hardness

CLC Number:

TG142.1

Zhang Wentao, Liu Chao, Du Yao, Min Yongan. Jominy end quenching characteristics of 52CrMoV4 leaf spring steel[J]. Heat Treatment of Metals, 2024, 49(4): 12-17.

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