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T-15 고속도강에서의 계면이동 현상에 대한 실험적 해석
은광용,박종구 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.6
Interface migration was observed during the CAP process of the T-15 high speed steel with addition of boron or boric acid. The reason of the interface migration was an alyzed by EDAX analysis and model experiments. The main cause of this phenomenon was attributed to the occurrence of coherence strain by the composition change of tungsten atoms during cooling.
은광용,박종구,윤덕용 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.10
The liquid phase sintering behaviors of WC-Co compacts with milled and unmilled WC powders and large Co powder had been observed and compared to those observed previously in W-Ni and Fe-Cu alloys which show spherical grains. The compacts with milled WC powder show steady densification even during heating to the liquid phase sintering temperature. The compacts with unmilled WC powders show pronounced local densification during the liquid phase sintering, producing large pores. This observation is attributed to the rearrangement of the polyhedral grains under asymmetric capillary forces. In the compacts with large Co powder, large pores are initially produced when the Co particles melt and flow into the surrounding fine capillaries, but during the subsequent sintering treatment, the pores are filled by the Co-rich liquid as has been observed in W-Ni and Fe-Cu powder compacts. The mechanism of the pore filling process in WC-Co is expected to be quite complex because of the polyhedral grain shape.