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首页> 外文期刊>Materials Science and Engineering >Influence of heat treatments on microstructure evolution and mechanical properties of Inconel 625 processed by laser powder bed fusion
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Influence of heat treatments on microstructure evolution and mechanical properties of Inconel 625 processed by laser powder bed fusion

机译：热处理对激光粉末床熔合Inconel 625显微组织演变和力学性能的影响

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摘要

This study investigated the mechanical behaviour and microstructure of as-built and heat-treated Inconel 625 (IN625) samples processed by laser powder bed fusion (LPBF). This process offers freedom in design to build complex IN625 components in order to overcome extensive machining. However, post heat treatments must be performed to obtain specific mechanical properties to match industrial requirements. For this purpose, different heat treatments were performed on IN625 samples, and through hardness measurements, three different heat treatments were selected, as optimised conditions. A direct ageing, a solutioning and a solutioning followed by ageing treatments were chosen to study the effects of these specific heat treatments on the microstructure and tensile properties, comparing them to those of as-built condition. The tensile properties of as-built and selected heat-treated IN625 samples showed superior values to minimum requirements for wrought IN625 alloys, whereas the investigation on the microstructures and fracture surfaces of as-built and heat-treated IN625 contributed to an understanding of the tensile properties evolution. The high tensile strength of as-built samples essentially derived from very fine dendritic structures mainly below 1 µm with high dislocation density and nanometric MC carbides. The high tensile properties of ageing treatments performed at 700 °C for 24 h, whether directly aged or post-solutioning, were found to be primarily dependent on γ" phases (10–30 nm) and M23C6carbides formation. By contrast, the tensile properties of solution-treated IN625 samples at 1150 °C for 2 h showed higher ductility coupled to lower strength than other conditions, due to the grain growth.
机译：这项研究调查了通过激光粉末床熔合（LPBF）处理的竣工和热处理Inconel 625（IN625）样品的力学行为和微观结构。该过程提供了设计自由，可以制造复杂的IN625组件，从而克服了广泛的机械加工问题。但是，必须执行后热处理以获得特定的机械性能以匹配工业要求。为此，对IN625样品进行了不同的热处理，通过硬度测量，选择了三种不同的热处理作为优化条件。选择直接时效，固溶和固溶后进行时效处理，以研究这些特定热处理对显微组织和拉伸性能的影响，并将其与建成状态进行比较。在建和选择的经过热处理的IN625样品的拉伸性能显示出优于锻制IN625合金最低要求的值，而对在建和经过热处理的IN625的显微组织和断裂表面的研究有助于理解拉伸强度。属性演变。竣工样品的高抗拉强度主要来源于极细的树枝状结构，主要是低于1μm的晶体，具有高位错密度和纳米MC碳化物。无论是直接老化还是后固溶，在700 C下进行24 h时效处理的高抗拉性能主要取决于γ“相（10-30nm）和M23C6碳化物的形成。相反，抗拉性能由于晶粒长大，在1150625C下进行2 h固溶处理的IN625样品显示出比其他条件更高的延展性和更低的强度。

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  • 来源
    《Materials Science and Engineering》 |2018年第27期|64-75|共12页
  • 作者

    Giulio Marchese; Massimo Lorusso; Simone Parizia; Emilio Bassini; Ji-Won Lee; Flaviana Calignano; Diego Manfredi; Mathieu Terner; Hyun-Uk Hong; Daniele Ugues; Mariangela Lombardi; Sara Biamino;

  • 作者单位

    Department of Applied Science and Technology, Politecnico di Torino;

    Center for Sustainable Future Technologies - CSFT@PoliTo, Istituto Italiano di Tecnologia;

    Department of Applied Science and Technology, Politecnico di Torino,Center for Sustainable Future Technologies - CSFT@PoliTo, Istituto Italiano di Tecnologia;

    Department of Applied Science and Technology, Politecnico di Torino;

    Department of Materials Science and Engineering, Changwon National University;

    Department of Management and Production Engineering, Politecnico di Torino;

    Center for Sustainable Future Technologies - CSFT@PoliTo, Istituto Italiano di Tecnologia;

    Department of Materials Science and Engineering, Changwon National University;

    Department of Materials Science and Engineering, Changwon National University;

    Department of Applied Science and Technology, Politecnico di Torino;

    Department of Applied Science and Technology, Politecnico di Torino,Center for Sustainable Future Technologies - CSFT@PoliTo, Istituto Italiano di Tecnologia;

    Department of Applied Science and Technology, Politecnico di Torino,Center for Sustainable Future Technologies - CSFT@PoliTo, Istituto Italiano di Tecnologia;

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  • 正文语种 eng
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  • 关键词

    Laser powder bed fusion; Nickel superalloys; Tensile behaviour; Microstructure; Hardness;

    机译：激光粉末床熔合镍高温合金拉伸性能显微组织硬度;

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