| Title |
Microstructure and Mechanical Characteristics of WC-3 wt% (Ni, Fe) Hard Materials by Spark Plasma Sintering for Friction Stir-Processing Tool Applications |
| Authors |
김대업(Dae-up Kim); 최영(Young Choi); 강봉용(Bong-yong Kang) |
| DOI |
https://doi.org/10.3365/KJMM.2016.54.3.187 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
spark plasma sintering; friction stir process; WC-3 wt% Ni; WC-3 wt% Fe; hard material |
| Abstract |
In this study, the microstructure and mechanical characteristics of WC-3 wt% Ni and WC-3 wt% Fe hard materials by spark plasma sintering (SPS) for friction stir-processing tool applications were evaluated. Sintered bodies with a diameter of 66 mm were fabricated with a relative density up to 99% after the simultaneous application of a pressure level of 60 MPa and electric current for 35 min mostly without grain growth during sintering. Only the initial phase existed in the initial powers and in the ball-milled powders, but the phases of W2C and WC1-x in all sintered bodies appeared after the sintering process. The Vickers hardness and fracture toughness of the WC-3 wt% Ni hard material were approximately 2,240 kg/mm2 and 9.1MPa·m1/2, respectively, while those of the WC-3 wt% Fe sintered body were correspondingly 2,242 kg/mm2 and 6.8 MPa·m1/2. |