Effect of solution treatment on microstructure and low temperature impact properties of 022Cr22Ni5Mo3N duplex stainless steel

doi:10.13251/j.issn.0254-6051.2024.10.003

Abstract

Abstract: Solution treatment for as-forged 022Cr22Ni5Mo3N duplex stainless steel was carried out, and the effects of solution temperature (1000-1100 ℃) and time (1 h and 2 h) on the microstructure and -46 ℃ low temperature impact properties were studied. The results show that with the increase of solution temperature, the austenite content of the 022Cr22Ni5Mo3N stainless steel decreases, the phase boundary of austenite tends to be smooth and the number of needle-type and island austenite in ferrite decreases gradually. The low temperature impact properties increase first and then decrease with the increase of solution temperature. When the solution temperature is 1050 ℃, the low temperature impact absorbed energy of the 022Cr22Ni5Mo3N stainless steel is higher, which is about 260 J. The solution treatment can change the austenite phase morphology and adjust the phase content. Serrated phase boundaries(below 1050 ℃) and lower austenite phase content(above 1050 ℃) promote the brittle fracture of dual-phase steels at low temperatures, which is the main reason for the reduction of low-temperature toughness.

Key words: 022Cr22Ni5Mo3N duplex stainless steel, solution treatment, phase morphology, phase ratio, low temperature impact properties

CLC Number:

TG142.71

Cui Liyun, Liu Qingtao, Luo Rui, Qian Xigen, Ding Hengnan, Sun Xi, Zhao Xiaotao, Liu Heng, Cheng Xiaonong. Effect of solution treatment on microstructure and low temperature impact properties of 022Cr22Ni5Mo3N duplex stainless steel[J]. Heat Treatment of Metals, 2024, 49(10): 18-24.

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