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5493 |
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Friday, June 09, 2017, Hall 14 2:40 PM Additive Manufacturing |
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Functional WC cemented carbide by the direct selective laser forming |
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Junya Yamada* / FUJIMI Incorporated, Japan Hiroyuki Ibe/ FUJIMI INCORPORATED, Japan Kazuto Sato/ FUJIMI INCORPORATED, Japan Nobuaki Kato/ FUJIMI INCORPORATED, Japan |
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Metal and polymer additive manufacturing are advancing on several applications. On the other hand, cermet materials such as WC/Co for functional structure molding by additive manufacturing are under studying There are few reports for WC cemented carbide additive manufacturing process by forming with polymer binder then sintering. This indirect process has difficulties to make high precision functional parts due to shape control during additional sintering process. Direct forming is desired for high precision parts. However factors and/or mechanism to achieve direct formed functional structure have been in black box. In this study, the process conditions of the direct selective laser melting were investigated to achieve dense and hard WC cemented carbide mold parts. The optimization of laser melting conditions for WC/12wt%Co agglomerated and sintered powder was examined. In order to forming a dense and high hardness parts, the optimum conditions between powder preparation and laser energy density which related with laser power, scan speed, spot diameter were appeared by this experiments. Moldings more than 1500HV are achieved at lower laser energy density. However some of pores are observed in moldings. In addition the dense molding can be obtained by higher laser energy density. This means optimum dense functional WC cemented carbide molding is available for growing industries like automotive, aviation and cutting tool. |