Shot Peening Process Effects on Metallurgical and Mechanical Properties of 316 L Steel via: Experimental and Neural Netw
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Shot Peening Process Effects on Metallurgical and Mechanical Properties of 316 L Steel via: Experimental and Neural Network Modeling E. Maleki1 · O. Unal2 Received: 28 June 2019 / Accepted: 2 September 2019 © The Korean Institute of Metals and Materials 2019
Abstract In the present study, a comprehensive investigation was accomplished on shot peening of AISI 316 L steel with a wide range of Almen intensity and surface coverage. Various experiments were performed to characterize the microstructure and mechanical properties of the peened specimens. For the modeling of the process, artificial neural network was used and the obtained experimental results were employed as data-set to develop the network. Modeling results have remarkable agreement with the experiments and then parametric analysis were applied based on the predicted values of the model. Keywords AISI 316L stainless steel · Shot peening · Simulation · Optimization
1 Introduction AISI 316L austenitic stainless steel, due to its considerable properties such as strong corrosion resistance in aggressive environments and exceptional biocompatibility extensively used in different industries from aerospace to bio [1–5]. 316L stainless steel has not considerable reaction to heat treatment for hardening [6–8]. Surface engineering via mechanical surface treatments are of great remarkable issues for recent years against chronic problems of fatigue, fretting wear and etc. Since development of surface with novel approaches presents new facilities to plain structural metals [9]. Mechanical surface treatments are based on exposing plastic deformation to make the materials dense by dislocation activities. The activities lead to hardness increase and compressive residual stress deposition [10]. Shot peening (SP) is one of the advantageous proves among them due to various application capability regardless of shape and dimension constraints [11].
* E. Maleki [email protected] 1
Mechanical Engineering Department, Sharif University of Technology-International Campus, Kish Island 79417‑76655, Iran
Mechanical Engineering Department, Karabuk University, 78050 Karabuk, Turkey
2
SP is a cold mechanical surface modification method to improve the fatigue, fretting wear and stress corrosion cracking behavior of metallic parts. The treatment is applied by using accelerated hard balls via pressurized air. The shot size, shot type, shot velocity are the ones which construct the ability to deformation [12]. Besides, surface coverage (the percentage of certain area deformed by shots) is the critical parameter to reveal the influence of the process. The level of the treatment is pre-determined by deforming sheets called “Almen strips”. The deflection in thin sheets result the level of condition to be used. Almen intensity is related with the deflection induced on the strips. The plastic deformation capability is referred by two crucial parameters, Almen intensity and surface coverage [13]. In recent years, surface nanocrystallization has been realized through mech
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