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        Aging Precipitation Behavior and Its Influence on Mechanical Properties of Mn18Cr18N Austenitic Stainless Steel

        Fengming Qin,Yajie Li,Wenwu He,Xiaodong Zhao,Huiqin Chen 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6

        The aging precipitation behavior in Mn18Cr18N austenitic stainless steel was investigated at temperatures from600 °C to 900 °C. During isothermal aging treatment, the primary precipitate was Cr2N with a = 0.478 nm and c =0.444 nm, and it preferentially nucleates along initial grain boundaries and gradually grows towards the interior ofgrains in discontinuous cellular way. Meanwhile, a small amount of granular face-centred cubic M23C6 with a =1.066 nm also were observed, which mainly form along grain boundaries. The effect of these precipitates onmechanical properties of the alloy was studied. It was found that precipitates result in degeneration of the matrixhardness. Meanwhile, the SEM morphologies of aged tensile sample show that the brittle fracture predominatesduring deformation, i.e. the fracture mode transforms from intergranular fracture to transgranular fracture with theincreasing of aging time. Compared with the solution-treated sample, the strength of the aged tensile samplesslightly decreases and plasticity remarkably deteriorates.

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