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소결기술의 기초적인 연구 : Rene 95 에서 분말의 열처리가 열간등압성형 조직에 미치는 영향
이상래,조창룡,김병훈 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.4
This study was perfomed as fundamental studies on the solid state sintering. The ordinary process of Rene 95 forming is canning of powders followed by HIPP'ing. In this study, the effects of pre -heat treatment, at 1150℃ for 30min after canning of powders, on the microstructure of the HIPP'ed Rene 95 were studied as compared with the ordinary HIPP'ing. The prior particle boundaries(PPB's) are well known to impair significantly the mechanical properties at service conditions. The PPB's are observed after 60 min ordinary HIPP'ing at 1150℃, 100MPa, In case of pre-heat treated powders the PPB's couldn't be found after 5 min HIPP'ing. The PPB's were appeared to be related to the precipitation of γ' phase in Rene 95. The pre-heat treatment of powders also assist the recrystallization during HIPP'ing. The grain size variations during HIPP'ing were caused by nuclation of recrystallization, grain growth and subsequent recrystallization(dynamic recrystallization). The microstructure of 30 min HIPP'ed sample of pre-heat treated powders was comparable with the sample HIPP'ed by ordinary process for 180 min at the same condition.
일방향응고한 Al-Al3Ni 공정복합재료의 비틀림특성에 관한 이론적 고찰
홍준표,권영두,이영문,이상래 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.4
A theoretical analysis was carried out on the torsional characteristics of directionally solidified Al-Al₃Ni eutectic composites. The torsional properties of the eutectic composites and the matrix were tested in order to estimate the torsional behavior of pure Al₃Ni fiber by means of the rule of mixtures. The Ludwik's equation T=Hγ^n was used to represent the shear stress and strain relation. The stress coefficient, H and strain hardening coefficient, n were obtained by minimizing the errors between the Torque-twist angle curve and the experimental data. The calculated Torque-twist angle curves using Ludwik's equation were shown to closely fit the experimental results, and the calculated stress and strain hardening coefficients of pure Al₃Ni fiber were 836,000∼881,600 KN/㎡ and 1, respectively. The rule of mixtures was more applicable for the torsional behavior than for the tensile behavior.