アーク熱源によるCr3C2-Co基複合金属の作製条件と諸特性

概要

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The objective of the present study is to make an investigation on fabrication condition of Cr3C2-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 Cr3C2 content, preheat temperature and wall thickness (fixing the base metal during fabrication of the composite) on the crack sensitivity in a Cr3C2-Co base alloy composite metal, (2) the effect of Cr3C2 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 Cr3C2 content and also demands higher preheat temperature. (2) Co base alloy is markedly strengthened by the addition of Cr3C2 and shows a peak in the strength of 107.3 kgf/mm2 with high ductility at 20% of Cr3C2. But the increment of Cr3C2 above 20% leads to the decrement of the strength due to the growth of needle structure of Cr3C2. (3) In the fabrication, it should be taken a consideration on the diffusion of the composite element at boundaries in the matrix metal.
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