热处理对LPBF GH3535高温合金组织、力学性能及辐照响应的影响

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-09-27 DOI:10.1016/j.matchar.2025.115587

Zhangjie Sun , Feida Chen , Jianjian Li , Kun Yang , Xiaobin Tang

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引用次数: 0

摘要

增材制造（AM）为下一代先进反应器的部件结构优化提供了一种很有前途的方法。然而，AM合金往往难以达到机械性能和耐辐照性的平衡组合。采用激光粉末床熔合（LPBF）制备了理论密度为99.996%的新型GH3535高温合金，并对其进行热等静压（HIP）和固溶热处理（SSHT）两步热处理。比较了三种LPBF GH3535试样的性能，评估了热处理对其显微组织和力学性能的影响。拉伸试验表明，在室温和700℃下，LPBF- hip - ssht样品的延展性都优于LPBF样品。采用纳米压痕试验对合金的辐照硬化行为进行了评价。TEM分析和氦气泡统计评价表明，LPBF和LPBF- hip - ssht样品具有相似的氦气泡大小和数量密度。与LPBF-HIP样品相比，LPBF-HIP- ssht GH3535合金表现出更强的氦耐受性和抗辐照硬化能力，这主要归功于大量纳米碳化物的存在。该研究为核工业应用的LPBF GH3535的设计和优化提供了重要的见解。

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Effects of heat treatment on microstructure, mechanical properties and irradiation response of LPBF GH3535 superalloy

Additive manufacturing (AM) offers a promising approach for the structural optimization of components in next generation advanced reactors. However, AM alloys often struggle to achieve a balanced combination of the mechanical properties and irradiation resistance. In this study, a novel GH3535 superalloy with a theoretical density of 99.996 % was fabricated using laser powder bed fusion (LPBF), followed by a two-step heat treatment consisting of hot isostatic pressing (HIP) and solid solution heat treatment (SSHT). The properties of three types of LPBF GH3535 samples were compared to assess the influence of heat treatment on their microstructure and mechanical properties. Tensile testing revealed that the LPBF-HIP-SSHT sample exhibited superior ductility compared to the LPBF sample, both at room temperature and 700 °C. Nanoindentation tests were conducted to evaluate the irradiation hardening behavior of the alloys. TEM analysis and helium bubble statistical evaluation showed that the LPBF and LPBF-HIP-SSHT samples had similar helium bubble sizes and number densities. When compared to the LPBF-HIP sample, the LPBF-HIP-SSHT GH3535 alloy demonstrated superior helium tolerance and enhanced resistance to irradiation hardening, largely attributed to the presence of a significant amount of nano-carbides. This study offers important insights into the design and optimization of LPBF GH3535 for nuclear industry applications.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.