Microstructure and properties of low carbon high strength ship steel after solution and aging treatment

doi:10.13251/j.issn.0254-6051.2022.07.006

Abstract

Abstract: Microstructure and mechanical properties of a low carbon high strength ship steel after solid solution and different temperature aging treatments were studied by means of SEM, EDS, tensile test and low temperature impact test. The results show that the microstructure of the steel after solution treatment at 900 ℃ h for 30 min is composed of polygonal ferrite and bainite/martensite, and the yield strength and tensile strength are 505 MPa and 625 MPa respectively. With the increases of aging temperature, the strength of the steel increases first and then decreases, the tensile strength and yield strength are the highest when the aging temperature is 500 ℃, which are 783 MPa and 747 MPa respectively, the elongation after fracture is 11.5%, and the impact absorbed energy at -20 ℃ is 96 J.

Key words: low carbon high strength ship steel, solution and aging treatment, impact absorbed energy, yield strength, elongation

CLC Number:

TG142.1

Li Menghuan, Zhang Luyou, Xu Haiwei, Dong Xinxin, Yang Zixuan, Tian Yaqiang, Chen Liansheng. Microstructure and properties of low carbon high strength ship steel after solution and aging treatment[J]. Heat Treatment of Metals, 2022, 47(7): 34-39.

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