Journal of the Japan Society of Powder and Powder Metallurgy
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
Effect of Debinding Conditions on the Carbon Content of Sintered 4340 Alloy Compacts by Metal Injection Molding
Hideki NakayamaTakuo TodaHideki KyogokuShinichiro Komatsu
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JOURNAL OPEN ACCESS

1996 Volume 43 Issue 3 Pages 368-372

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Abstract
Effects of debinding conditions on the carbon content and mechanical properties of sintered 4340 alloy compacts made by injection moldings were studied. Specimens were made of gas-atomized 4340 alloy powder which was blended with binders and injected into a metallic mold. The compacts were debound in air at the temperatures between 513K and 553K for 7.2ks. They were sintered in vacuum at 1623K for 7.2ks. The carbon content of sintered compacts decreased linearly with increasing in debinding temperature. This means that the carbon content of sintered compacts can be controlled accurately by the debinding temperature. In the range of debinding temperature lower than 533K, the density of sintered compacts decreased with increasing in debinding temperature, and in the range of debinding temperature higher than 533K, it became constant. The mechanical properties of sintered compacts changed with the carbon content. The higher the debinding temperature was, the lower the tensile strength of sintered compacts and the higher the elongation became.
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