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Mechanical Behaviour of Inconel 718 Thin-Walled Laser Welded Components for Aircraft Engines

机译:飞机发动机的Inconel 718薄壁激光焊接部件的机械性能

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Nickel alloys are very important in many aerospace applications, especially to manufacture gas turbines and aero engine components, where high strength and temperature resistance are necessary. These kinds of alloys have to be welded with high energy density processes, in order to preserve their high mechanical properties. In this work, CO2laser overlap joints between Inconel 718 sheets of limited thickness in the absence of postweld heat treatment were made. The main application of this kind of joint is the manufacturing of a helicopter engine component. In particular the aim was to obtain a specific cross section geometry, necessary to overcome the mechanical stresses found in these working conditions without failure. Static and dynamic tests were performed to assess the welds and the parent material fatigue life behaviour. Furthermore, the life trend was identified. This research pointed out that a full joint shape control is possible by choosing proper welding parameters and that the laser beam process allows the maintenance of high tensile strength and ductility of Inconel 718 but caused many liquation microcracks in the heat affected zone (HAZ). In spite of these microcracks, the fatigue behaviour of the overlap welds complies with the technical specifications required by the application.
机译:镍合金在许多航空航天应用中非常重要,特别是对于制造需要高强度和耐高温性的燃气轮机和航空发动机部件而言。为了保持其高机械性能,必须使用高能量密度工艺焊接这些合金。在这项工作中,在没有焊后热处理的情况下,在有限厚度的Inconel 718薄板之间制作了CO2激光重叠接头。这种接头的主要应用是直升机发动机部件的制造。特别地,目的是获得特定的横截面几何形状,这是克服在这些工作条件下发现的机械应力而无故障所必需的。进行了静态和动态测试,以评估焊缝和母材的疲劳寿命行为。此外,确定了生活趋势。这项研究指出,通过选择适当的焊接参数可以实现完全的接头形状控制,并且激光束工艺可以维持Inconel 718的高拉伸强度和延展性,但会在热影响区(HAZ)中引起许多液化微裂纹。尽管存在这些微裂纹,搭接焊缝的疲劳性能仍符合应用要求的技术规格。

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