成形角度對激光選區(qū)熔化成形CoCrMoW合金的影響

成形角度對激光選區(qū)熔化成形CoCrMoW合金的影響Effect of sloping angle on forming of CoCrMoW alloy by selective laser melting

以自主制備的氣霧化CoCrMoW合金球形微細(xì)粉末為原料，采用激光選區(qū)熔化(SLM)工藝成形出與加工平面成不同角度的試樣，并研究其顯微組織與物理力學(xué)性能。結(jié)果表明：成形試樣主要由FCC的γ相和HCP的ε相組成。隨著成形傾斜角度的增大，試樣的相對密度呈現(xiàn)先減小后增大的趨勢，傾斜角為90°時(shí)，試樣密度最高，相對密度達(dá)到99.2%；表面粗糙度呈現(xiàn)先增加后減小的趨勢，在0°時(shí)達(dá)到最小值7.84 μm，在15°時(shí)達(dá)到最大值19.85 μm；抗拉強(qiáng)度、伸長率及顯微硬度大致呈現(xiàn)先增大后減小的趨勢，抗拉強(qiáng)度和顯微硬度在60°時(shí)達(dá)到最大值，分別為1174MPa和412.5HV，伸長率在45°時(shí)達(dá)到最大值12.9%。

CoCrMoW alloy was formed by selective laser melting with different sloping angles using self-prepared spherical fine powder, its microstructure and mechanical properties were studied. The results indicate that microstructures of SLM samples are composed of γ phase in FCC structure and ε phase in HCP structure. With the increase of sloping angle, the alloy density decreases firstly and then increases gradually, and reaches at a maximum of 99.2% when the sloping angle is 90°. On the contrary, the surface roughness of the specimens increases initially and then decreases. A minimum roughness of 7.84 μm and a maximum roughness of 19.85 μm appear at 0° and 15°. Meanwhile, the ultimate tensile strength, elongation and microhardness arise initially, then drop afterward. The ultimate tensile strength and microhardness reach at a maximum of 1174 MPa and 412.5 HV, respectively, when the sloping angle is 60°. The elongation reaches at a maximum of 12.9% at an angle of 45°.

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