LPBF 哈氏合金 X 在宽温度和应变范围内的循环机械响应:实验和建模

IF 3.4 3区 工程技术 Q1 MECHANICS
P. Markovic , P. Scheel , R. Wróbel , C. Leinenbach , E. Mazza , E. Hosseini
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引用次数: 0

摘要

通过激光粉末床熔融(LPBF)等工艺对高温合金进行增材制造(AM),由于其设计自由度极高,可制造出有助于提高航空航天和能源系统效率的复杂零件,因而受到了广泛关注,并正在迅速发展。通过这种工艺生产的材料具有独特的微观结构和机械性能,因此有必要对其进行专门的研究和表征。在此背景下,我们的研究重点是对哈氏合金 X (HX) 在 22 至 1000 °C 的温度范围内和各种应变速率下的等温循环粘塑性机械响应进行实验表征,以填补目前文献中的空白。我们认识到需要能够准确表示 LPBF HX 在广泛温度范围内的循环机械响应的材料模型,因此开发了粘塑性各向同性运动硬化 Chaboche 模型的稳健扩展,旨在应用于 LPBF 过程的热机械模拟,以分析残余应力和变形,以及评估 LPBF 组件的机械完整性。该模型的扩展包括用分析函数明确表达整套模型参数,以考虑其温度依赖性。因此,该模型包含了相对较多的参数,以表示合金在较宽温度范围内的各向同性运动硬化粘塑性响应。该模型最终证明了它有能力在所考察的温度和应变率范围内精确表示合金的等温响应。为了评估该模型对非等温条件的预测能力,还进行了相外热机械循环实验作为独立的基准测试,模型的预测结果与实验结果相当一致。作为本研究的一部分,已将推导出的材料模型集成到 UMAT 子程序中,并对一致的雅各布矩阵进行了分析推导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cyclic mechanical response of LPBF Hastelloy X over a wide temperature and strain range: Experiments and modelling

Additive manufacturing (AM) of high-temperature alloys through processes such as laser powder bed fusion (LPBF) has gained significant interest and is rapidly expanding due to its exceptional design freedom, which enables the fabrication of complex parts that contribute to the increased efficiency of aerospace and energy systems. The materials produced through this process exhibit unique microstructures and mechanical properties, which necessitate dedicated study and characterization. In this context, our research focuses on the experimental characterization of the isothermal cyclic viscoplastic mechanical response of Hastelloy X (HX) over the temperature range of 22 to 1000 °C and at various strain rates, addressing a current gap in the literature. Recognizing the need for material models that can accurately represent the cyclic mechanical response of LPBF HX across a broad temperature range, we developed a robust extension of the viscoplastic isotropic-kinematic hardening Chaboche model, intended for applications in the thermomechanical simulation of the LPBF process for the analysis of residual stress and distortion, as well as for assessing the mechanical integrity of LPBF components. The extension involves expressing the entire set of model parameters explicitly with analytical functions to account for their temperature dependence. Consequently, the model includes a relatively large number of parameters to represent the isotropic-kinematic hardening viscoplastic response of the alloy over a wide temperature range, and hence to overcome the endeavor of its systematic calibration, a dedicated calibration approach was introduced. The model ultimately demonstrated its capability to precisely represent the isothermal response of the alloy over the examined temperatures and strain rates. To evaluate the model’s predictiveness for non-isothermal conditions, out-of-phase thermomechanical cyclic experiments were also conducted as independent benchmark tests, where the model’s predictions were fairly consistent with the experimental results. As a part of this study, the derived material model has been integrated into the UMAT subroutine, complete with an analytical derivation of the consistent Jacobian matrix.

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来源期刊
CiteScore
6.70
自引率
8.30%
发文量
405
审稿时长
70 days
期刊介绍: The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.
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