| 摘要 |
PURPOSE:To prevent the deterioration of the characteristics of an overlaid layer and to suppress the occurrence of blowholes by regulating the Si, B and O contents in overlaying alloy powder so that the value M defined by a specified equality is set within a specified range. CONSTITUTION:Ni-Cr alloy powder as overlaying alloy powder is mixed with hard particles and irradiated with laser light to carry out overlaying. At this time, the Si, B and O contents in the overlaying alloy powder are regulated so that the value M defined by an equality M=Si(wt.%)+2XB(wt.%)XO(wt.%) is set within the range of 0.06-0.30. An oxidation reaction is moderately inhibited and the amt. of the base metal penetrated into the overlaid layer is reduced. |
