摘 要
本研究利用積層製造中的選擇性雷射熔融(Selective Laser Melting, SLM)技術，透過調
整製程參數中的掃描間距參數由300到1000μm以製備出17-4 PH、Inconel 718及Ti64 ELI
(Extra Low Interstitial)不同孔隙程度之SLM多孔材料，而三種多孔材料的最大孔隙率分別為
67.67、51.15及40.34%。本研究觀察到在類似SLM參數下，三種多孔材料之孔隙率出現差
異，因此進一步透過冪定律(power law)迴歸求出能量密度與孔隙率間的關係，其中三種材
料的係數ϕ0皆接近100%，而E0分別為1.07×105、7.14×104及9.09×104 J/mole。進而與三種
合金的材料性質比較，其中以17-4 PH材料黏性及飽和蒸氣壓最高，造成多孔材料孔隙程度
最高，而Inconel 718則因從固相轉變為液相所需之熱焓量較小、熱導率較低，因此其孔隙
程度最低。
關鍵詞：選擇性雷射熔融、體積能量密度、多孔材料、孔隙率
ABSTRACT
Selective laser melting (SLM) is employed to manufacture 17-4 PH, Inconel 718, and Ti64
ELI (Extra Lowe Interstitial) porous material by adjusting hatch distance from 300 to 1000 μm.
The largest porosity of three materials employed in current study are 67.67, 51.15, and 40.34%,
respectively. The fact that at the similar energy density, by using power law, the relations
between energy density and porosity are obtained. The coefficients of three materials, ϕ0, are allapproximately 100%, and the E0 coefficients of three materials are 1.07×105, 9.09×104, and
7.14×104 J/mm3, respectively. Among the three materials investigated, 17-4 PH has the highest
the viscosity and the vapor pressure which gives rise to the highest level of porosity and E0
coefficient. In contrast, Inconel 718 requires lower enthalpy to heat from solid to liquid, so it has
the lowest level of porosity.
Key Words: Selective Laser Melting, Volumetric Energy Density, Porous Material, Porosity
