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研究了激光快速成形Inconel 718超合金试样3个相互垂直方向的拉伸力学性能,以及热处理对激光快速成形凝固组织与3个相互垂直方向拉伸力学性能的影响。结果表明,激光快速成形Inconel 718超合金试样3个相互垂直方向的拉伸力学性能均明显低于其锻件拉伸力学性能,且表现出明显的各向异性。经过热处理的Inconel 718超合金试样,其沿沉积高度方向定向外延生长的柱状枝晶组织转变为晶粒粗大且不均匀的等轴状再结晶组织,随Laves相固溶消失及强化相γ″和γ′大量析出,3个相互垂直方向上的拉伸力学性能均大幅度提高,其中,与基板平行的两个相互垂直方向上的拉伸力学性能均达到Inconel 718超合金锻件拉伸力学性能标准,但沿成形件高度方向,出现拉伸力学性低于Inconel 718超合金锻件拉伸力学性能标准的试样。
The tensile mechanical properties of the 3 rapidly intercontinental laser Inconel 718 superalloys and the effect of heat treatment on the rapid mechanical properties of laser rapid prototyping and solidification in 3 mutually perpendicular directions were studied. The results show that the tensile mechanical properties of the 3 rapidly-formed Inconel 718 superalloy samples are significantly lower than the mechanical properties of the forging tensile strength, and show significant anisotropy. After heat treatment, the Inconel 718 superalloy samples transformed into columnar dendrites with epitaxial growth oriented in the depositional height direction, and changed into coarse and inhomogeneous equiaxed recrystallized microstructures. With the disappearance of solid solution and the γ " And γ ’were precipitated in a large amount. The mechanical properties of the three perpendicular to each other were greatly improved. Among them, the tensile mechanical properties of two mutually perpendicular directions parallel to the substrate reached the tensile mechanical properties of Inconel 718 superalloy Standard, but along the height of the profile, a specimen exhibiting less tensile mechanical properties than the tensile mechanical properties of Inconel 718 superalloy was obtained.