电子束熔丝增材制造GH4169组织及力学性能研究

电子束熔丝增材制造GH4169组织及力学性能研究 Research on microstructure and mechanical properties of GH4169 by electron beam fuse additive manufacturing 谭和 TAN He 1 first-author 卜文德 BU Wende 1 柯黎明 KE Liming 1 南昌航空大学轻合金加工科学与技术国防重点学科实验室 南昌航空大学轻合金加工科学与技术国防重点学科实验室 National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University 对电子束熔丝增材制造GH4169多道多层沉积试样块进行了研究,分析了电子束熔丝增材制造沉积块不同高度与不同成形方向的显微组织以及力学性能。结果表明,电子束熔丝增材制造的GH4169组织及力学性能存在明显的各向异性。成形试样的显微组织主要为γ相和共晶γ+Laves相以及碳化物相,枝晶间存在大量的Laves条带;不同成形方向上的组织有所差异,沿送丝方向(Ds)为等轴"十字形"γ枝晶,沉积高度方向(Dd)、水平方向(Dt)的典型组织为柱状晶。EDS结果显示,同一层有少量的Nb、Mo元素偏析。沿沉积高度方向显微硬度呈现逐渐上升趋势,水平方向硬度基本围绕某一值浮动。拉伸性能有明显的各向异性,沿着送丝方向(Ds)和水平方向(Dt)抗拉强度明显高于沉积高度方向(Dd),整体低于高温合金锻件室温拉伸强度。 The electron beam fuse additive manufacturing of GH4169 multi-layer multi-pass deposition sample block was studied,and the microstructure and mechanical properties of the deposition block of electron beam fuse additive manufacturing at different heights and different forming directions were analyzed. The results show that there is obvious anisotropy in the microstructure and mechanical properties of GH4169 additive manufactured by electron beam fuse. The microstructures of the formed samples are mainly γ phase,eutectic γ +Laves phase and carbide phase. There are a large number of Laves bands between dendrites;the microstructure is different in different forming directions,the microstructure along the wire feed direction（Ds） is isometric "cross-shaped" γ dendrites,the typical microstructure of the deposition height direction（Dd）and horizontal direction（ Dt） is columnar crystals. The EDS results show that a small amount of Nb and Mo elements segregated in the same layer. Along the deposition height direction,the microhardness gradually shows an upward trend,and along the horizontal direction,the microhardness basically fluctuates around a certain value. The tensile proper-ties are obviously anisotropic,and the tensile strength along the wire feed direction（Ds） and horizontal direction（Dt） is signifi-cantly higher than that along the deposition height direction（Dd）,and the overall tensile strength is lower than that of high temperature alloy forgings at room temperature. 电子束熔丝增材制造 GH4169 显微组织 力学性能 electron beam fuse additive manufacturing GH4169 microstructure mechanical properties TG132.3 2022-03-08 8 51