通过调制激光粉末床熔融技术生产的 IN718 合金中的残余应力

IF 2 3区 工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
K. Georgilas, H. Guo, B. Ahmad, R. H. U. Khan, M. E. Fitzpatrick, M. E. Kartal
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引用次数: 0

摘要

背景激光粉末床熔融(L-PBF)增材制造(AM)用于逐层制造金属零件,在制造过程中往往会在层间产生不均匀的热梯度,导致零件冷却时产生残余应力。目的研究了 L-PBF 过程中使用的调制激光对 Inconel 718 (IN718) 材料残余应力的影响。方法采用等高线法测量样品横截面上的全场残余应力分量。结果结果表明,残余应力分布对构建方向很敏感,构建方向的残余应力比横向的残余应力大。结论坯件中的残余应力很大,因此在开发后热处理时需要进一步考虑如何消除残余应力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Residual Stresses in Alloy IN718 Produced Through Modulated Laser Powder Bed Fusion

Residual Stresses in Alloy IN718 Produced Through Modulated Laser Powder Bed Fusion

Background

Laser powder bed fusion (L-PBF) additive manufacturing (AM) is used for building metallic parts layer-by-layer and often generates non-uniform thermal gradients between layers during fabrication, resulting in the development of residual stresses when parts are cooled down.

Objective

The impact of modulated laser used during the L-PBF process on residual stresses in Inconel 718 (IN718) material was investigated. The impact of build directions on residual stress is also determined.

Methods

The contour method is employed to measure the full-field residual stress component on the cross-section of samples. A complementary residual stress measurement method, incremental hole drilling, was employed for obtaining in-plane residual stress components.

Results

The results show that the residual stress distribution is sensitive to the build direction, with a higher magnitude of residual stress in the direction of build than that in the transverse direction. Multiple measurements with the same manufacturing parameters show good repeatability.

Conclusion

Residual stresses in the as-built parts are significant and hence a further consideration regarding relieving residual stresses is required when post-thermal treatments are developed.

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来源期刊
Experimental Mechanics
Experimental Mechanics 物理-材料科学:表征与测试
CiteScore
4.40
自引率
16.70%
发文量
111
审稿时长
3 months
期刊介绍: Experimental Mechanics is the official journal of the Society for Experimental Mechanics that publishes papers in all areas of experimentation including its theoretical and computational analysis. The journal covers research in design and implementation of novel or improved experiments to characterize materials, structures and systems. Articles extending the frontiers of experimental mechanics at large and small scales are particularly welcome. Coverage extends from research in solid and fluids mechanics to fields at the intersection of disciplines including physics, chemistry and biology. Development of new devices and technologies for metrology applications in a wide range of industrial sectors (e.g., manufacturing, high-performance materials, aerospace, information technology, medicine, energy and environmental technologies) is also covered.
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