title: Microstructure, mechanical property and metal release of As-SLM CoCrW alloy under different solution treatment conditions.
abstract: In the study, the microstructure, mechanical property and metal release behavior of selective laser melted CoCrW alloys under different solution treatment conditions were systemically investigated to assess their potential use in orthopedic implants. The effects of the solution treatment on the microstructure, mechanical properties and metal release were systematically studied by OM, SEM, XRD, tensile test, and ICP-AES, respectively. The XRD indicated that during the solution treatment the alloy underwent the transformation of γ-fcc to ε-hcp phase; the ε-hcp phase nearly dominated in the alloy when treated at 1200°C following the water quenching; the results from OM, SEM showed that the microstructural change was occurred under different solution treatments; solution at 1150°C with furnace cooling contributed to the formation of larger precipitates at the grain boundary regions, while the size and number of the precipitates was decreased as heated above 1100°C with the water quenching; moreover, the diamond-like structure was invisible at higher solution temperature over 1150°C following water quenching; compared with the furnace cooling, the alloy quenched by water showed excellent mechanical properties and low amount of metal release; as the alloy heated at 1200°C, the mechanical properties of the alloy reached their optimum combination at UTS=1113.6MPa, 0.2%YS=639.5MPa, and E%=20.1%, whilst showed the lower total quantity of metal release. It is suggested that a proper solution treatment is an efficient strategy for improving the mechanical properties and corrosion resistance of As-SLM CoCrW alloy that show acceptable tensile ductility.
authors.affiliation: Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, China.
authors.forename: Yanjin
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, China.
authors.forename: Songquan
authors.initials: S
authors.lastname: Wu
authors.affiliation: Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, China.
authors.forename: Yiliang
authors.initials: Y
authors.lastname: Gan
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, China.
authors.forename: Shuyuan
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, China.
authors.forename: Sai
authors.initials: S
authors.lastname: Guo
authors.affiliation: Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Lin
authors.affiliation: Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, China. Electronic address: Franklin@fjirsm.ac.cn.
authors.forename: Jinxin
authors.initials: J
authors.lastname: Lin
mesh_terms: D000497:Alloys / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D007834:Lasers; D055595:Mechanical Phenomena; D044367:Phase Transition; D012996:Solutions; D014414:Tungsten / Q000737:chemistry*
chemical_list: D000497:Alloys; D012996:Solutions; D002857:Chromium; D003035:Cobalt; D014414:Tungsten
keywords: CoCrW alloy; Heat treatment; Mechanical property; Metal release; Selective laser melting