Heat treatment process of 00Ni18Co7Mo5Ti steel for belting of star arrow relief lock

doi:10.13251/j.issn.0254-6051.2023.02.029

Abstract

Abstract: The strength and elongation of the 00Ni18Co7Mo5Ti maraging hardened stainless steel at different aging temperatures were studied by means of universal testing machine and Rockwell hardness tester. The analyses from mechanism show that the strength of the steel increases with the increase of aging temperature, and reaches the peak value at about 500 ℃ because of the precipitation of Ni₃Ti and Ni₃Mo dispersive phases. As the temperature continues to increase, the strength of the steel gradually decreases, while the elongation gradually increases due to the increase of reversed austenite. At the same time, the experiments and mechanism analysis show that on the premise that the strength of the steel does not be greatly reduced, appropriately increasing the aging temperature or prolonging the aging time can increase the elongation of the steel by increasing the content of reversed austenite, where the microstructure of the steel is mainly martensite and a small amount of reversed austenite, and the main strengthening phases are Ni₃Ti, Ni₃Mo and other dispersed phases.

Key words: maraging hardening stainless steel, aging treatment, reversed austenite, strength, elongation

CLC Number:

TG161

Wang Ping, Tian Shaokun, Zhu Hongwei, Yang Kun, Jin Yuanping, Wang Shuqing, Huang Yanjun, Zhu Jing. Heat treatment process of 00Ni18Co7Mo5Ti steel for belting of star arrow relief lock[J]. Heat Treatment of Metals, 2023, 48(2): 189-194.

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