Effect of carbon content on microstructure and properties of SA-508 Gr.3 steel heavy forgings

doi:10.13251/j.issn.0254-6051.2021.07.015

Abstract

Abstract: Effect of carbon content on microstructure and properties of heavy forgings of SA-508 Gr.3 steel was investigated. The results show that as the carbon content of the steel increases, the bainite transformation temperature decreases and the precipitation amount of M₃C carbides increases. The tensile strength at room temperature and at 350 ℃ are obviously improved, the impact properties first increase and then decrease, and the impact fracture morphologies at 0 ℃ change from mixed fracture to dimple fracture. In order to obtain a better performance, the carbon content of SA-508 Gr.3 steel should be controlled within 0.19%~0.22%(mass fraction).

Key words: SA-508 Gr.3 steel, heavy forgings, carbon content, microstructure, property

CLC Number:

TG142.33

Zhang Mingqiao, Fu Mingjiao, Zhao Xiaoguang, Fu Chaozheng, Wang Hongyu, Li Zhuolin. Effect of carbon content on microstructure and properties of SA-508 Gr.3 steel heavy forgings[J]. Heat Treatment of Metals, 2021, 46(7): 79-83.

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