0.4 wt% Ni을 첨가한 W 활성소결체의 고온압축 특성 연구

서지정보

· 발행기관 : 한국분말야금학회
· 수록지 정보 : 한국분말야금학회지 / 9권 / 5호
· 저자명 : 이승익, 김순욱, 박영삼, 문인형

영어초록

The high temperature deformation behavior of the activated sintered W powder compacts was investigated. The W compact showed the relative density of 94% with the average W grain size of by activated sintering at for 1 hour. Compression tests were carried out in the temperature range of at the strain rate range of /sec - /sec. True stress-strain curve and microstructure exhibited the grain boundary brittleness which was dependent on the compression test temperature. The activated sintered W compact showed that the maximum stress as well as the strain at the maximum stress was abruptly decreased as the test temperature increase from to 1000 and regardless of the strain rate. The discrepancy of the microstructure in the specimen center was obviously observed with the increase of the test temperature. After compression test at the W grain was severely deformed normally against the compression axis. However, after compression test at and the W grain was not deformed, but the microcrack was formed in the W grain boundary. The Ni-rich second phase segregated along the W grain boundary could be partly unstable over and affect the poor mechanical property of the activated sintered W compact.

참고자료

· 없음