Abstract

Recently, there has been a significant amount of interest in additive manufacturing of aerospace parts from heat-resistant alloys due to the ability of producing more complex shapes parts in comparison with conventional technologies. This paper describes the research results of selective laser melting (SLM) of nickel-based IN-738 superalloy powder. The main research results of studies are microstructure investigation after SLM, hot isostatic pressing (HIP), and heat treatment on the cylindrical samples. The article presents results of short-term strength tests of cylindrical specimens at room temperature and 900 °C, and long-term strength. The research studies the influence of HIP on stress-strain behavior of specimens, which are built at different angles: 0, 45, 90°. The tensile strength of vertical samples is increasing by 60 MPa, at 45° is decreasing by 75 MPa, and at 0° is increasing by 139 MPa compared with the initial state. The developing IN-738 selective laser melting technology is approving by fabrication of GTE nozzle guide vane.

中文翻译：

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选择性激光熔化制造燃气轮机喷嘴导向叶片的IN-738高温合金的微观组织和力学性能的研究

摘要

近来，由于与常规技术相比能够生产更复杂形状的零件，因此由耐热合金对航空零件进行增材制造引起了极大的兴趣。本文介绍了镍基IN-738高温合金粉末的选择性激光熔化（SLM）的研究结果。研究的主要研究结果是SLM，热等静压（HIP）和对圆柱形样品进行热处理后的显微组织研究。本文介绍了在室温和900°C下圆柱试样的短期强度测试结果以及长期强度。这项研究研究了HIP对标本应力-应变行为的影响，这些标本以不同的角度构建：0、45、90°。垂直样品的抗拉强度提高了60 MPa，与初始状态相比，在45°时减小75 MPa，在0°时增大139 MPa。通过制造GTE喷嘴导流叶片，正在开发中的IN-738选择性激光熔化技术正在得到批准。