Effect of stabilization treatment on second phase and properties of347H stainless steel

doi:10.13251/j.issn.0254-6051.2021.07.028

Abstract

Abstract: Phase diagram of the 347H stainless steel was simulated by JMatPro software, and the effect of stabilization temperature on second phase, mechanical properties and corrosion resistance were analyzed. The results show that the second phase of the 347H steel during solidification is mainly NbN, Nb(C,N), M₂₃C₆, σ phase and Z phase. The second phase after solid solution at 1140 ℃ is mainly Nb (C, N) and a small amount of NbN and M₂₃C₆, with the size of about 0.5 μm.After stabilization at 800-1000 ℃, the grain size of the steel plate changes little with the increase of stabilization temperature,and the grain size is 7.5 grade. With the increase of stabilization temperature, the size of the second phase grows significantly to over 5 μm, and EDS analysis shows that NbC is the main secondary phase. The yield strength of the 347H steel stabilized at 800 ℃ and 850 ℃ is higher, and the tensile strength changes little with the increase of stabilizing temperature. The corrosion rate of the stabilized steel is lower than that of the solid solution state, and the intergranular corrosion resistance of the 347H steel is improved.

Key words: 347H stainless steel, stabilization, second phase, property

CLC Number:

Liu Tianzeng, Wang Ke, Cheng Anzhong, Li Hongliang. Effect of stabilization treatment on second phase and properties of347H stainless steel[J]. Heat Treatment of Metals, 2021, 46(7): 149-154.

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