期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 84, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2019.105025
关键词
Selective laser melting; Pure tungsten; Microstructure; Compressive strength; Wear resistance
资金
- Science Challenge Project [TZ2018006-0301-02]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Due to the intrinsic properties of tungsten, such as high melting point and high thermal conductivity, selective laser melting of pure W parts experiences many challenges. In this study, the effects of volumetric energy density on the densification behavior, microstructure evolution and mechanical performances of SLM-processed pure tungsten parts were investigated. A maximum density of 19.0 g/cm(3) (98.4% of the theoretical density) was obtained at the optimal energy density of 1000 J/mm(3) and its microstructure was free of pores and balling phenomenon. The formation mechanism of pores and cracks was systematically investigated. The microhardness and compressive strength of SLM-processed pure W parts reached 474 HV and 902 MPa, respectively, which were comparable to the samples produced by conventional manufacturing methods. The morphology of fracture demonstrated that the fracture mechanism of SLM-processed pure W parts was brittle fracture and intergranular fracture was the main fracture mode. Dry sliding wear tests showed that the wear mechanism changed with the energy density. For pure W parts processed by SLM at the optimal parameters, the adhesion of hardened tribolayers was formed. In this case, the reduced coefficient of friction (COF) of 0.45 and a low wear rate of 1.3 x 10(-5) mm(3).N-1.m(-1 )were obtained.
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