방전 플라즈마에 의한 마찰교반공정 툴용 WC-3 wt% (Ni, Fe) 소결체의 미세조직 및 기계적특성

• Published in: 대한금속·재료학회지, 54(3) Vol. 54; no. 3; pp. 187 - 193
• Main Authors: 김대업, Dae-up Kim, 최영, Young Choi, 강봉용, Bong-yong Kang
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 05.03.2016; 대한금속·재료학회
• Subjects: friction stir process; hard material; spark plasma sintering; WC-3 wt% Fe; WC-3 wt% Ni; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2016.54.3.187

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.