Porosity, Hardness, Friction and Wear Performance Analysis of H13 SLM-Formed Samples
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JMEPEG https://doi.org/10.1007/s11665-020-04999-0
Porosity, Hardness, Friction and Wear Performance Analysis of H13 SLM-Formed Samples Gabriel Awuku Dzukey, Ke Yang, Qiuyu Wang, Bailiang Zhuang, and Wenda Hou (Submitted August 16, 2019; in revised form June 23, 2020) Selective laser melting (SLM), a type of additive manufacturing, is a powder bed process that makes use of a high-power laser beam to completely melt a thin layer of powder on a substrate, layer upon layer to form a solid part. This experimental study confirmed that laser power and scanning speed are indeed SLMÕs most significant process parameters that affect porosity as stated in some literature and further studied the influence of laser power and/or laser-based volumetric energy density (VED) on hardness and friction and wear of SLM-formed samples. Full factorial design of experiment was carried out to study the influence of the two parameters on porosity with the help of Minitab 18 statistical software. The results obtained from this experiment were analyzed using analysis of variance. VED and laser power influence on hardness and friction and wear were studied on one factor at a time basis. Optimum laser power and scanning speed, optimum laser energy density values that achieve higher surface microhardness, minimum wear and porosity of H13 steel material were obtained from this experimental study. Keywords
design of experiment, friction and wear, H13 tool steel, microhardness, selective laser melting
1. Introduction Selective laser melting (SLM) is one of the types of additive manufacturing (AM), a novel manufacturing process that has recently gained the attention of industry experts worldwide, (Ref 1) because it seems to be one of the most viable technologies for direct fabrication of complex metallic components (Ref 2). In SLM, a high-power laser beam completely melts a thin layer of metallic powder to produce sheets of molten powder layer upon layer, which then solidifies to form the required metallic component. Process parameters such as layer thickness, laser power, scanning speed and hatching distance which together determine the laser energy density/ volumetric energy density (VED) do affect the build rate and properties of the finished part, and changing these process parameters controls the build process. A specific range of parameter combinations exists for each SLM processed material that results in higher quality and/or desired-level mechanical properties. To determine a suitable parameter set for each material is, therefore, a fundamental requirement, and this study focuses on the H13 steel material.
Gabriel Awuku Dzukey, Ke Yang, and Qiuyu Wang, College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China; and Engineering Research Center of Dredging Technology of Ministry of Education, Hohai University, Changzhou 213022, China; Bailiang Zhuang, Jiangsu Institute, China Academy of Machinery Science and Technology Co., Ltd., Changzhou 213200, China; Wenda Hou, School of Mechanical Engineering, Jiangsu Univers
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