INFLUENCE OF ANNEALING ON THE DEPTH MICROSTRUCTURE OF THE SHOT PEENED DUPLEX STAINLESS STEEL AT ELEVATED TEMPERATURE

Qiang Feng, Jia She, Yong Xiang, Xianyun Wu, Chengxi Wang and Chuanhai Jiang
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Qiang Feng: College of Physics and Engineering, Chengdu Normal University, Chengdu, Sichuan 611130, P. R. China
Jia She: #x2020;Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213, P. R. China
Yong Xiang: College of Physics and Engineering, Chengdu Normal University, Chengdu, Sichuan 611130, P. R. China
Xianyun Wu: College of Physics and Engineering, Chengdu Normal University, Chengdu, Sichuan 611130, P. R. China
Chengxi Wang: #x2021;School of Materials Science and Engineering, Shanghai Jiao Tong University No. 800, Dongchuan Road, Shanghai 200240, P. R. China
Chuanhai Jiang: #x2021;School of Materials Science and Engineering, Shanghai Jiao Tong University No. 800, Dongchuan Road, Shanghai 200240, P. R. China

Surface Review and Letters (SRL), 2018, vol. 25, issue 02, 1-7

Abstract: The depth profiles of residual stresses and lattice parameters in the surface layers of shot peened duplex stainless steel at elevated temperature were investigated utilizing X-ray diffraction analysis. At each deformation depth, residual stress distributions in both ferrite and austenite were studied by X-ray diffraction stress analysis which is performed on the basis of the sin2ψ method and the lattice parameters were explored by Rietveld method. The results reveal that difference changes of depth residual compressive stress profiles between ferrite and austenite under the same annealing condition are resulted from the diverse coefficient of thermal expansion, dislocation density, etc. for different phases in duplex stainless steel. The relaxations of depth residual stresses in austenite are more obvious than those in ferrite. The lattice parameters decrease in the surface layer with the extending of annealing time, however, they increase along the depth after annealing for 16min. The change of the depth lattice parameters can be ascribed to both thermal expansion and the relaxation of residual stress. The different changes of microstructure at elevated temperature between ferrite and austenite are discussed.

Keywords: Duplex stainless steel; lattice parameter; shot peening; annealing; residual stress (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X18500592

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