Effect of Shot-Peening Duration on Surface Integrity of Selective Laser Melted Steel Components
- سال انتشار: 1404
- محل انتشار: مهندسی مکانیک مدرس، دوره: 25، شماره: 9
- کد COI اختصاصی: JR_MME-25-9_003
- زبان مقاله: فارسی
- تعداد مشاهده: 18
نویسندگان
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
چکیده
Additive manufacturing, particularly Selective Laser Melting (SLM), has emerged as a transformative technology for fabricating complex metallic components; however, surface roughness, porosity, and tensile residual stresses remain major challenges limiting its industrial deployment. Addressing these issues requires efficient post-processing strategies capable of enhancing surface integrity without altering SLM parameters. In this study, Fe–Ni–Cu steel alloy specimens were fabricated using an EOSINT M-۲۵۰ Xtended SLM machine equipped with a ۱۰۰ W fiber laser, and the influence of shot-peening duration on their mechanical and surface properties was investigated. Four samples were prepared—one as a reference and three subjected to peening for ۴, ۶, and ۹ min. Comprehensive analyses were performed, including microhardness testing, surface roughness measurements, SEM observation, Clemex image analysis, and X-ray diffraction residual-stress assessment. Results showed that extending the peening duration from ۴ to ۹ min progressively improved surface quality and stress state: surface roughness decreased by ۶۶.۳%, microhardness increased by ۲۰.۸%, and the initial tensile residual stress of +۱۳۵ MPa was converted into a compressive stress of about –۳۲۲ MPa. Surface porosity also dropped from ≈ ۲۱% to below ۱۰%, confirming effective pore closure and densification of the upper layers. These findings demonstrate that controlled shot-peening, particularly within the ۶–۹ minute range, is a simple yet highly efficient post-processing method for improving the surface integrity and mechanical performance of SLM-fabricated Fe–Ni–Cu steel componentsکلیدواژه ها
Additive Manufacturing, Selective Laser Melting (SLM), Shot-peening, Surface integrityاطلاعات بیشتر در مورد COI
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