The objective of the present study is to make an investigation on fabrication condition of Cr
3C
2-Co base alloy composite by arc energy melting, and on the characteristics. That is, this paper deals with the investigation in (1) the effects of Cr
3C
2 content, preheat temperature and wall thickness (fixing the base metal during fabrication of the composite) on the crack sensitivity in a Cr
3C
2-Co base alloy composite metal, (2) the effect of Cr
3C
2 content on strengthening the matrix alloy and (3) the microstructure or the hardness in the composite metal.
The results obtained are as follows:
(1) Thickness of deposition layers hardened becomes thinner with increasing in Cr
3C
2 content and also demands higher preheat temperature.
(2) Co base alloy is markedly strengthened by the addition of Cr
3C
2 and shows a peak in the strength of 107.3 kgf/mm
2 with high ductility at 20% of Cr
3C
2. But the increment of Cr
3C
2 above 20% leads to the decrement of the strength due to the growth of needle structure of Cr
3C
2.
(3) In the fabrication, it should be taken a consideration on the diffusion of the composite element at boundaries in the matrix metal.
View full abstract