Ferritic-austenitic duplex steels demonstrate a complex deformational behavior even in the absence of mechanical loads. Purely thermal cycling in the temperature interval from 20°C to 900°C can cause either accumulation of inelastic strains (thermal ratchetting) or plastic shakedown, depending on microstructure morphology and/or the strength and thermal properties of the constituting phases. In this paper, a study is undertaken on duplex steel containing nitrogen, including experimental and theoretical analyses at microscopic and macroscopic levels. High-precision dilatometry and roughness measurements are accompanied by thorough numerical simulations based on different microstructural models.

Issue Section:
Technical Papers
Keywords:
austenitic stainless steel, plastic flow, yield stress, thermal stresses, surface topography, thermal expansion, yield strength, finite element analysis, crystal microstructure
Topics:
Deformation, Steel, Stress, Surface roughness, Temperature, Cycles, Nitrogen
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