Iron & Steel Society of Iran International Journal of Iron & Steel Society of Iran 2981-0388 19 1 2022 01 21 Investigating the effect of distance of carbon steel particles from the impacted surface on mechanical properties in SMAT process of AZ31 using molecular dynamics بررسی تاثیر فاصله ذرات فولاد کربنی از سطح ضربه خورده بر خواص مکانیکی در فرآیند SMAT AZ31 با استفاده از دینامیک مولکولی 8 14 252645 10.22034/ijissi.2022.550549.1223 EN Ali Kazemi Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Isfahan, Iran Ali Heidari Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Isfahan, Iran Kamran Amini Department of Materialsl Engineering, Majlesi Branch, Islamic Azad University, Isfahan, Iran Farshid Aghadavoudi Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Isfahan, Iran Mohsen Loh-Mousavi Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Isfahan, Iran Journal Article 2022 03 13 In the surface mechanical attrition treatment (SMAT) process, the material surface layer is peened with a high-velocity number of carbon steel shot particles. Various parameters such as the distance of the peening gun to the impacted surface can affect the material's surface mechanical properties in the SMAT process. In this paper, the molecular dynamics (MD) approach has been used to study the effect of particle distance from the impacted surface on mechanical and physical behavior of AZ31 after the SMAT process. For this purpose, Universal Force Field (UFF) and Embedded Atom Model (EAM) force field have been utilized for atomic interactions. Based on the molecular simulation results, residual stress, hardness, and temperature of the atomic surface layer have been obtained for various distances. The simulation results demonstrated that reducing the particle distance in the SMAT process increases residual stress and surface layer hardness. Numerically, the maximum residual stress value of 268 MPa has been obtained for a distance of 5 nm in the SMAT molecular simulation results. https://journal.issiran.com/article_252645_2407fe0f151b38546ccc2db29160fafd.pdf