Effect of tempering time on microstructure and mechanical properties of Cr-Ni-Cu high strength steel for ships

doi:10.13251/j.issn.0254-6051.2024.02.033

Abstract

Abstract: The microstructure evolution and mechanical properties of Cr-Ni-Cu high strength steel for ships after quenching and tempering were studied by means of SEM, EDS, mechanical test and low temperature impact test. The results show that after directly quenching and quenching at 900 ℃ for 30 min, both the microstructure is composed of lath martensite and retained austenite, but the low-temperature impact absorbed energy of the latter is higher than that of the former at -20 ℃ (56 J and 64 J, respectively), which is mainly attributed to the larger lath spacing of martensite. When tempered at 500 ℃ for 30, 60, 120, 240 and 480 min, the yield strength, tensile strength and low-temperature impact absorbed energy of the alloy steel show a trend of increasing first and then decreasing. The maximum tensile strength is 1021 MPa, the maximum yield strength is 998 MPa, and the maximum low-temperature impact absorbed energy at -20 ℃ is 86 J.

Key words: high strength steel for ships, heat treatment, lath martensite, retained austenite, mechanical properties

CLC Number:

TG142.1

Dong Xinxin, Wu Jing, Li Menghuan, Tian Yaqiang, Tang Qin. Effect of tempering time on microstructure and mechanical properties of Cr-Ni-Cu high strength steel for ships[J]. Heat Treatment of Metals, 2024, 49(2): 208-214.

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