Investigation on the Aging Precipitation Behavior of 254SMo Super Austenitic Stainless Steel and the Effect of Precipitation on Its Mechanical Properties
LIU Chenglong1, TANG Zhengyou1,2, MA Liang1, MA Wanwan1, GUO Haodong1, Ding Hua1,2
1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China 2 Key Laboratory of Lightweight Structural Materials, Shenyang 110819, China
Abstract: The effect of different aging treatment temperature on the precipitation behavior of 254SMo super austenitic stainless steel and the effect of precipitation on its mechanical properties were studied by optical microscope(OM), scanning electron microscope (SEM) with energy dispersive spectrometer (EDS), and transmission electron microscope(TEM). The results show that the χ phase is distributed in granular form in 254SMo austenitic stainless steel, the precipitation sensitive temperature of χ phase is 800 ℃; the σ phase is distributed in strips, and the precipitation sensitive temperature is 900 ℃. Both the χ phase and the σ phase are Mo-rich and low-Ni compounds, and the Mo content in the σ phase is higher than that in the χ phase. When the aging temperature is 900 ℃, the number of precipitated phases in the experimental steel reaches the maximum, and the tensile strength of the experimental steel is the highest, the value is 825 MPa, and the elongation is the lowest, the value is 31%. The results of the fracture analysis of the sample show that, compared to the χ phase, σ phase is more harmful to the plasticity of the experimental steel.
刘成龙, 唐正友, 马亮, 马婉婉, 郭昊东, 丁桦. 254SMo超级奥氏体不锈钢时效析出行为及析出相对其力学性能的影响[J]. 材料导报, 2021, 35(24): 24147-24151.
LIU Chenglong, TANG Zhengyou, MA Liang, MA Wanwan, GUO Haodong, Ding Hua. Investigation on the Aging Precipitation Behavior of 254SMo Super Austenitic Stainless Steel and the Effect of Precipitation on Its Mechanical Properties. Materials Reports, 2021, 35(24): 24147-24151.
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2021, Vol. 35 
