基于晶体塑性建模的纹理优化,提高热处理添加剂制造的 Al-Mn-Sc 合金的强度并控制其各向异性

IF 10.3 1区 工程技术 Q1 ENGINEERING, MANUFACTURING Additive manufacturing Pub Date : 2024-09-05 DOI:10.1016/j.addma.2024.104524
Yuan Gao, Xiaobin Guo
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引用次数: 0

摘要

热处理是控制机械性能的常用方法,但其对强度和各向异性的影响仍不确定。因此,研究热处理导致的微结构演变及其对强度的影响对于优化热处理工艺以减少各向异性至关重要。虽然霍尔-佩奇(HallPetch)关系证明了晶粒大小对屈服强度的影响,但晶粒取向对强度的影响仍不明确,也不能充分预测强度的各向异性。本研究以实验结果为基础,通过晶体塑性模型阐明了晶粒取向与强度各向异性之间的关系。根据添加剂制造(AMed)和热处理样品的电子反向散射衍射结果构建了二维几何模型。晶体塑性模型沿不同方向应用,以评估纹理对强度各向异性的影响。建模结果表明,AMed Al-Mn-Sc 合金中具有<100>和<102>取向的晶粒以及热处理状态下具有<112>取向的晶粒对屈服强度不利。为了提高屈服强度并将屈服强度的各向异性保持在 5% 的范围内,将 <100> 纹理优化为 43% <110> 和 57% <113>。因此,屈服强度沿建筑方向提高了 11 兆帕,沿横向提高了 21 兆帕。这种优化方法有效地提高了 AMed 合金在各种条件下的强度并降低了各向异性。
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Texture optimization based on crystal plasticity modeling to improve strength and control anisotropy in heat treated additive manufactured Al-Mn-Sc alloy
Heat treatment is a common method used to control mechanical properties, but its effects on strength and anisotropy remain uncertain. Therefore, studying the microstructural evolution resulting from heat treatment and its impact on strength is essential for optimizing heat treatment processes to reduce anisotropy. While the HallPetch relation has demonstrated the influence of grain size on yield strength, the effect of grain orientation on strength is still unclear and does not adequately predict the anisotropy of strength. In this work, the relationship between grain orientation and strength anisotropy is elucidated through crystal plasticity modeling on the basis of experimental results. Two-dimensional geometry models were constructed from the electron back-scattered diffraction results of additive manufactured (AMed) and heat-treated samples. Crystal plasticity modeling was applied along various directions to assess the influence of texture on the anisotropy of strength. The modeling results indicated that the presence of grains with <100> and <102> orientations in the AMed Al-Mn-Sc alloy and of grains with <112> orientations in the heat-treated state are detrimental to the yield strength. To increase the yield strength and maintain the anisotropy of the yield strength within a 5 % range, the <100> texture was optimized to 43 % <110> and 57 % <113> textures. Consequently, the yield strength increased by 11 MPa along the building direction and 21 MPa along the transverse direction. This optimization approach effectively enhances the strength and reduces the anisotropy in AMed alloys under various conditions.
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来源期刊
Additive manufacturing
Additive manufacturing Materials Science-General Materials Science
CiteScore
19.80
自引率
12.70%
发文量
648
审稿时长
35 days
期刊介绍: Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.
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