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Vol.29, No.3, 206 ~ 212, 1991
Title
The Effect of Atmosphere and Carbon Addition on the Sintering Behaviour of AISI 4600 Alloy Steel Powder for Powder Forging
배광욱Kwang Wook Bae, 이재성Jai Sung Lee
Abstract
The sintering behaviour of AISI 4600(Ni-Mo) alloy steel powder for powder forging has been investigated. The powder compacts with the green density of 60-80%TD(theoretical density) were sintered at 1120℃ for 15 min in flowing Ar, N₂+3H₂ or H₂ atmosphere. The volume shrinkage and weight loss of powder compacts during sintering were larger in reducing atmospheres than in Ar atmosphere. In case of an addition of 0.45wt%C, the sintering kinetics was enhanced irrespective of the sintering atmosphere. In the Ar atmosphere, however the enhancement effect was the highest; this was attributed to the reduction of surface oxide and acceleration of Fe-atom diffusion by free carbon. The sintering behaviour of C-added powder compacts was also discussed, based on the chemical analysis of residual C and O content.
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