Effects of Carbon, Cobalt, and Powder Annealing on Sintering Characteristics of BM2 Type High Speed Steel
Authors: Maulik, P.; Price, W. J. C.
Source: Powder Metallurgy, Number 3, 1987 , pp. 165-174(10)
Publisher: Maney Publishing
Abstract:Formation of grain boundary film and excessive grain growth restrict the upper useful sintering temperature for BM2 grade of high speed steel. Since cobalt bearing grades of steel, e.g. BM35, BM42, appear to have superior sintering characteristics, densification of cobalt enriched BM2 grades of HSS has been carried out – by vacuum sintering of cold compacted water atomized annealed powder. Cobalt additions of 2, 4, and 8%, however, did not lower the sintering temperature. A small decrease observed in the BM2 + 4% cobalt alloy, to 1245–1260°C from 1250-1260°C for the other compositions, was interpreted as a slight carbon enrichment of the particular powder batch, since the addition of elemental carbon was found to lower the sintering temperature. The effect of powder annealing conditions on the sintering behaviour was also studied. Vacuum annealing at 950°C was superior to hydrogen annealing at the same temperature which in turn showed better sintering response than hydrogen annealing at 900°C. In the sintered alloys the primary carbides were M6C and MC. Additionally, M3C type carbide was observed in BM2 + 8%Co and in the carbon enriched alloys. PM/0405
Document Type: Research Article
Publication date: 1987-01-01
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