Microstructure and properties of new type bainitic leaf spring steel

doi:10.13251/j.issn.0254-6051.2022.07.027

Abstract

Abstract: Aiming at the problems of automobile weight reduction and environmental protection, a new type of bainitic leaf spring steel for automobiles was designed and developed, and the microstructure and mechanical properties were studied. The results show that the carbide-free bainitic microstructure of the steel can be obtained by normalizing. XRD test results show that its phase composition is dominated by α phase; The steel has excellent comprehensive mechanical properties and corrosion resistance, with yield strength of nearly 1200 MPa, tensile strength of 1400 MPa, impact absorbed energy of 73.2 J or more at room temperature, and excellent match of strength and toughness.

Key words: bainitic steel, automobile leaf spring, microstructure, toughness, hardness

CLC Number:

TG142.1

Jang Wenmiao, Hu Zhihua, Luan Daocheng, Zhang Xu, Ling Junhua, Yin Zhiming, Li Yuan, Zhou Xinyu, Wang Zhengyun. Microstructure and properties of new type bainitic leaf spring steel[J]. Heat Treatment of Metals, 2022, 47(7): 151-155.

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