Effect of Ni content on microstructure and properties of A330M ultra-high strength steel

doi:10.13251/j.issn.0254-6051.2023.11.007

Abstract

Abstract: Influence of Ni content (1.85%, 3.85%, 5.00%) on microstructure and mechanical properties of A330M ultra-high strength steel was studied by means of scanning electron microscope, transmission electron microscope and mechanical properties test. The results show that the microstructure of the tested steel after quenching and tempering at low temperature is mainly composed of lath martensite, retained austenite and ε carbide. In the range of 1.85%-5.00% Ni content, the Ms point of the tested steel gradually decreases with the increase of Ni content, and the content of retained austenite in the structure gradually increases. The tensile strength and yield strength decrease with the increase of Ni content, the impact absorbed energy increases significantly, and the proportion of impact fracture dimples increases. Comparing the strength and toughness of the A330M steel with three kinds of Ni content, 3.85% Ni content can obtain the best strength and toughness matching, tensile strength is 2207 MPa, impact absorbed energy is 34 J.

Key words: Ni content, ultra-high strength steel, Ms point, microstructure, mechanical properties

CLC Number:

TG142.1

Xiao Kai, Han Shun, Xu Zhongzhi, Geng Ruming, Xia Huimin, Xu Zhengwei, Li Yong, Wang Chunxu. Effect of Ni content on microstructure and properties of A330M ultra-high strength steel[J]. Heat Treatment of Metals, 2023, 48(11): 45-49.

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