High temperature mechanical properties of Mn18Cr18N high nitrogen austenitic stainless steel

doi:10.13251/j.issn.0254-6051.2022.01.029

Abstract

Abstract: High temperature mechanical properties of the Mn18Cr18N high nitrogen austenitic stainless steel were studied, with the high temperature tensile test being carried out by Gleeble-2000 thermal simulation testing machine, the fracture morphology and vicinity microstructure of the tensile specimens being observed by scanning electron microscopy-energy dispersive spectrometer, and the phase transformation and precipitated phases of the tested steel being studied by Thermo-Calc calculation. The results show that the corresponding temperature of brittle zone Ⅰ of the tested steel is higher than 1200 ℃, and that of brittle zone Ⅲ is 850-950 ℃, while the brittle zone Ⅱ does not appear. The appearance of the brittle zone Ⅰ is mainly caused by the transformation from γ austenite to δ ferrite during heating process of the tested steel, and that of the brittle zone Ⅲ is caused by the intergranular hard and brittle precipitated phases such as M₂₃C₆ and M₂(C, N). With the increase of tensile test temperature, the tensile strength of the tested steel decreases. The reduction of area gradually increases in the temperature range of 1000-1200 ℃ and shows excellent thermoplasticity, which is above 70%. While when the temperature exceeds 1200 ℃, the reduction of area decreases sharply. The hot forging temperature of the Mn18Cr18N high nitrogen austenitic stainless steel should be selected between 1000 ℃ and 1150 ℃, during which the reduction of area of the tested steel is above 70%, and the brittle zones Ⅰ and Ⅲ can be avoided.

Key words: high nitrogen austenitic stainless steel, high temperature mechanical properties, high temperature tensile test, strength and plasticity, Thermo-Calc software

CLC Number:

TG142.7

Wang Yinghu, Zheng Huaibei, Bai Qingqing, Song Lingxi, Hu Jin, Huang Bo. High temperature mechanical properties of Mn18Cr18N high nitrogen austenitic stainless steel[J]. Heat Treatment of Metals, 2022, 47(1): 172-177.

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