Effect of solution temperature and cold deformation on microstructure and low temperature impact properties of S32750 duplex stainless steel tube

doi:10.13251/j.issn.0254-6051.2022.01.038

Abstract

Abstract: Microstructure and impact absorbed energy of the S32750 duplex stainless steel tube were studied by means of metallographic microscope, scanning electron microscope and impact test. The effect of solution temperature and cold deformation on the low-temperature impact absorbed energy and microstructure of the S32750 stainless steel tube was analyzed. The results show that the roundness coefficient of γ phase increases from 7.10 to 27.25 with the increase of cold deformation from 30% to 60%, and the impact absorbed energy at low temperature gradually increases, especially which at -46 ℃ increases by about 2 times, together with the change of the impact fracture morphology. The proportion of γ phase decreases with the increase of heat treatment temperature from 1060 ℃ to 1120 ℃, and the impact absorbed energy at low temperature decreases, especially which at -40 ℃ decreases by 53.4%.

Key words: solution treatment temperature, strain, low temperature impact absorbed energy, S32750 duplex stainless steel

CLC Number:

TG335.71

Wang Man, Shen Qiang, Luo Youxin, Nai Qiliang, Wang Baoshun, Wu Minghua, Zhu Xiongming. Effect of solution temperature and cold deformation on microstructure and low temperature impact properties of S32750 duplex stainless steel tube[J]. Heat Treatment of Metals, 2022, 47(1): 233-238.

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