超硬合金のレーザ溶融積層造形における焼結体の相対密度に及ぼすレーザ走査経路の影響

抄録

Two-step laser scanning was proposed for improving relative density of fabricated body of WC-25mass%Co cemented carbide by selective laser melting. In the two-step laser scanning, the laser was scanned at the same pitch with the melted and solidified width of the WC-Co powder in first laser scanning. The powder was supplied to the unsolidified part in the first laser scanning, then the laser was scanned at the same pitch with the melted and solidified width from a position shifted by a half pitch of the scanning in second laser scanning. On the other hand, the laser was scanned at half pitch of the melted and solidified width in one-step laser scanning. Compared with the relative density of the fabricated body in the one-step laser scanning, the relative density in the two-step laser scanning was improved from 0.58 to 0.68.