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Vol.38, No.6, 811 ~ 817, 2000
Title
Pesearch Paper / Powder Metallurgy : Analysis of the Densification of Powder Compacts using Power - law Creep Model
김형섭Hyoung Seop Kim,홍순익Sun Ig Hong
Abstract
Densification behaviour of powder compacts during pressure-assisted compaction at an elevated temperature was investigated based on power-law creep. A constitutive equation for power-law creep which satisfies the uniaxial stress condition is proposed based on the plastic deformation theory for porous materials. The proposed power-law creep model is compared with Shima and Oyane`s model and Kim and Jeon`s model. Experimental data generated by hot isostatic pressing of 316 stainless steel powder compacts at a temperature of 1125℃ under different pleasures were compared with calculated results using the proposed constitutive model. The difference between the calculated results and the experimental values was discussed in conjunction with Ashby`s densification mechanism map or HIP diagram.
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