title: Microstructure and mechanical properties of stainless steel/calcium silicate composites manufactured by selective laser melting.
abstract: Selective laser melting (SLM) is raised as one kind of additive manufacturing (AM) which is based on the discrete-stacking concept. This technique can fabricate advanced composites with desirable properties directly from 3D CAD data. In this research, 316L stainless steel (316L SS) and different fractions of calcium silicate (CaSiO3) composites (weight fractions of calcium silicate are 0%, 5%,10% and 15%, respectively) were prepared by SLM technique with a purpose to develop biomedical metallic materials. The relative density, tensile, microhardness and elastic modulus of the composites were tested, their microstructures and fracture morphologies were observed using optical microscope (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the addition of CaSiO3particles influenced the microstructure and mechanical properties of specimens significantly. The CaSiO3precipitates from the overlap of adjacent tracks and became the origin of the defects. The tensile strength of specimens range 320-722MPa. The microhardness and elastic modulus are around 250HV and 215GPa respectively. These composites were ductile materials and the fracture mode of the composites was mixed mode of ductile and brittle fracture. The 316L SS/CaSiO3composites can be a potential biomedical metallic materials in the medical field.
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China; Shanghai Key Lab. of D&A for Metal-Functional Materials, Shanghai 201804, China.
authors.forename: Zeng
authors.initials: Z
authors.lastname: Zheng
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China; Shanghai Aerospace Equipments Manufacturer, Shanghai 200240, China.
authors.forename: Lianfeng
authors.initials: L
authors.lastname: Wang
authors.affiliation: Shanghai Aircraft Manufacturing Co., Ltd, Shanghai 200436, China.
authors.forename: Min
authors.initials: M
authors.lastname: Jia
authors.affiliation: Shanghai Aerospace Equipments Manufacturer, Shanghai 200240, China.
authors.forename: Lingyu
authors.initials: L
authors.lastname: Cheng
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China; Shanghai Key Lab. of D&A for Metal-Functional Materials, Shanghai 201804, China. Electronic address: 84016@tongji.edu.cn.
authors.forename: Biao
authors.initials: B
authors.lastname: Yan
mesh_terms: D001672:Biocompatible Materials / Q000138:chemical synthesis* / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D055119:Elastic Modulus; D007834:Lasers; D017640:Silicates / Q000737:chemistry*; D013193:Stainless Steel / Q000737:chemistry*; D013718:Tensile Strength
chemical_list: D001672:Biocompatible Materials; D017610:Calcium Compounds; D017640:Silicates; D013193:Stainless Steel; C031293:calcium silicate
keywords: Calcium silicate; Mechanical properties; Microstructure; Selective laser melting; Stainless steel