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Vol.54, No.3, 187 ~ 194, 2016
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| Title |
| Microstructure and Mechanical Characteristics of WC-3 wt% (Ni, Fe) Hard Materials by Spark Plasma Sintering for Friction Stir-Processing Tool Applications |
| 김대업 Dae-up Kim , 최영 Young Choi , 강봉용 Bong-yong Kang |
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| 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. |
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| Key Words |
| spark plasma sintering, friction stir process, WC-3 wt% Ni, WC-3 wt% Fe, hard material |
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