Abstract
This study investigated the microstructure and room temperature mechanical properties of W-7Ni-3Fe (wt%) tungsten heavy alloy (as-fabricated) which was manufactured by metal injection molding (MIM). To identify the effect of heat treatment on the W-7Ni-3Fe alloy, its properties were compared after heattreatment (1,100 °C for 1 hour) in vacuum atmosphere. The initial microstructural observations confirmed that both the as-fabricated and heat-treated specimens were composed of W phase and γ(Ni, Fe) phase. Vickers hardness measurements were 363.7 Hv for the as-fabricated specimen and 387.2 Hv for the heat-treated specimen. Room temperature tensile strength was tested, and the yield strength of the as-fabricated and heattreated specimens were 698.3 and 714.0 MPa, and the ultimate tensile strengths were 760.8 and 960.0 MPa, respectively. The elongation of the two materials was 2.4% (as-fabricated) and 20.3% (heat-treated). It was found that additional heat treatment after MIM significantly improved the alloyâs mechanical properties. In addition, fracture surface observation results confirmed that the main crack propagated along the interface between the spherical W phase and γ(Ni, Fe) phase in the as-fabricated specimen, and traversed the W phase in the heat-treated specimen. Based on the above findings, this study also discusses the fracture mechanisms of tungsten heavy alloy manufactured with MIM. Key words: W-7Ni-3Fe, metal injection molding, tungsten heavy alloy, microstructure, tensile properties
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.