Induced Residual Stress in Austenitic Stainless Steel F138 after Shot Peening and Plasma Nitriding Surface Treatment

Abstract:

Shot peening mechanical treatment surface, commonly used to improve material surface mechanical properties, as fatigue and wear resistance increase, induces deformations in the material crystal lattice, characterized by the presence of stress. Additionally, plasma nitriding, another surface treatment used to minimize failures in austenitic stainless steels, can produce resistant surface layers, composed of the interstitial nitrogen atoms accommodated in austenitic structure, increasing the layer hardness. Thus, the present work aims to study the residual stress and layer formation on austenitic stainless steel F138 surface, after different treatment conditions. Plasma nitriding treatment after shot peening differences were analyzed. Residual stress was investigated by X-ray diffraction, using sin²ψ method. Samples of surface morphology and formed layer were analyzed by scanning electron microscopy (SEM) and X-ray diffraction. Previous shot peening treatment to plasma nitriding promotes the formation of a less homogeneous layer, with microcracks and induced residual stress increase. It was observed the formation of iron nitrides and expanded austenite after plasma nitriding treatment. Surface residual stress induction after shot peening and plasma nitriding treatments can be efficient methods to improve material mechanical properties.

• Periodical: Defect and Diffusion Forum (Volume 439)
• Pages: 147-156
• DOI: https://doi.org/10.4028/p-vO6EMn
• Online since: February 2025
• Authors: Eloana P.R. de Oliveira, Rene R. de Oliveira, José G. Vicente, Marcos Massi, Antonio Augusto Couto*
• Keywords: Fatigue, Plasma Nitriding, Residual Stress, Shot Peening, Stainless Steel F138

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