Microstructure and loading direction dependent hardening and damage behavior of laser powder bed fusion AlSi10Mg
(2022) Materials Science and Engineering: A — Vol. 832, p. 142484 (2022)
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MaterialsScienceEngineeringA8322022142484.pdf
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- Authors
Zhao, Lv 
- Abstract
- The correlation between mechanical behavior and heterogeneous microstructure is still unclear for laser powder bed fusion AlSi10Mg. The present work investigates strain hardening and damage mechanisms with different build platform temperatures (35 ◦C and 200 ◦C) and loading directions (horizontal and vertical, building direction being vertical) to probe the effects of microstructure size and melt pool border orientation. The 35 ◦C microstructure involves load direction independent properties, with ductility determined by damage initiation occurring extremely close to final failure. In contrast, the 200 ◦C microstructure exhibits anisotropic mechanical behavior, as revealed by higher strain hardening capacity, earlier damage initiation and more dispersed damage distribution for the vertical loading direction. Although the vertical samples generally involve strain localization and crack propagation along the melt pool border, their ductility is not compromised compared to the horizontal counterparts. We attempt to explain these hardening and damage behaviors with stress partition and trade-off between phase stress and strain gradient.
- Affiliations
Huazhong University of Science and Technology Department of Mechanics, School of Aerospace Engineering Nanjing Tech University Key Laboratory for Light-weight Materials Hubei Key Laboratory of Engineering Structure Analysis and Safety Assessment
Citations
Song, L., Zhao, L., Ding, L., Zhu, Y., Huang, M., Simar, A., & Li, Z. (2022). Microstructure and loading direction dependent hardening and damage behavior of laser powder bed fusion AlSi10Mg. Materials Science and Engineering: A, 832, 142484. https://doi.org/10.1016/j.msea.2021.142484 (Original work published 2022)