Abstract
Selective laser melting is a powder-bed-fusion process that is applied to different alloys. Thus, it is essential to study what are the different process variables that affect the static, quasi-static, and cyclic mechanical properties . In this contribution, two examples of alloys are introduced: AlSi (AlSi12, AlSi10Mg ) and Ti-6Al-4V. The influence of controlled cooling and degassing mechanisms of residual gases is investigated by structural analysis in electron microscopy and X-ray computed tomography . Controlled cooling through platform heating or multi-exposure treatments increased the dendritic width in AlSi alloys and decomposed alpha prime in Ti-6Al-4V. The alteration was a cause for enhanced ductility and slowing of crack propagation . The cyclic deformation is tracked during mechanical testing and is simulated in FE software using a high-throughput methodology to calculate Woehler curves based on Fatemi-Socie damage parameters. The cyclic deformation simulation is in agreement with the experimental data and quantified cyclic damage using Fatemi-Socie parameters.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Song B, Dong S, Zhang B, Liao H, Coddet C (2012) Effects of processing parameters on microstructure and mechanical property of selective laser melted Ti-6Al-4V. Mater Des 35:120–125
Dutta B, Froes F (2017) The additive manufacturing (AM) of titanium alloys. Met Powder Rep 72(2):96–106
Siddique S, Awd M, Tenkamp J, Walther F (2017) Development of a stochastic approach for fatigue life prediction of AlSi12 alloy processed by selective laser melting. Eng Fail Anal 79:34–50
Siddique S, Awd M, Tenkamp J, Walther F (2017) High and very high cycle fatigue failure mechanisms in selective laser melted aluminum alloys. J Mater Res 32(23):4296–4304
Awd M, Tenkamp J, Hirtler M, Siddique S, Bambach M, Walther F (2018) Comparison of microstructure and mechanical properties of Scalmalloy® produced by selective laser melting and laser metal deposition. Materials 11(1):1–17
Wang Y, Kamath C, Voisin T, Li Z (2018) A processing diagram for high-density Ti-6Al-4V by selective laser melting. Rapid Prototyping J 24(9):1469–1478
Diatlov A, Buchbinder D, Meiners W, Wissenbach K, Bultmann J (2012) Towards surface topography: quantification of selective laser melting (SLM) built parts. In: Innovative developments in virtual and physical prototyping: proceedings of the 5th international conference on advanced research in virtual and rapid prototyping, Taylor and Francis Inc., Leiria, Portugal, pp 595–602
Jamshidinia M, Kovacevic R (2015) The influence of heat accumulation on the surface roughness in powder-bed additive manufacturing. Surf Topogr Metrol Prop 3(1):014003
Wang Z, Xiao Z, Tse Y, Huang C, Zhang W (2019) Optimization of processing parameters and establishment of a relationship between microstructure and mechanical properties of SLM titanium alloy. Opt Laser Technol 112:159–167
Longhitano G, Larosa M, Jardini A, Zavaglia C, Lerardi M (2018) Correlation between microstructures and mechanical properties under tensile and compression tests of heat-treated Ti-6Al-4V ELI alloy produced by additive manufacturing for biomedical applications. J Mater Process Technol 252:202–210
Simonelli M, Tse Y, Tuck C (2014) Effect of the build orientation on the mechanical properties and fracture modes of SLM Ti-6Al-4V. Mater Sci Eng, A 616:1–11
Bagehorn S, Wehr J, Maier H (2017) Application of mechanical surface finishing processes for roughness reduction and fatigue improvement of additively manufactured Ti-6Al-4V parts. Int J Fatigue 102:135–142
Shui X, Yamanaka K, Mori M, Nagata Y, Kurita K, Chiba A (2017) Effects of post-processing on cyclic fatigue response of a titanium alloy additively manufactured by electron beam melting. Mater Sci Eng, A 680:239–248
Benedetti M, Torresani E, Leoni M, Fontanari V, Bandini M, Pederzolli C, Potrich C (2017) The effect of post-sintering treatments on the fatigue and biological behavior of Ti-6Al-4V ELI parts made by selective laser melting. J Mech Behav Biomed Mater 71:295–306
Wycisk E, Solbach A, Siddique S, Herzog D, Walther F, Emmelmann C (2014) Effects of defects in laser additive manufactured Ti-6Al-4V on fatigue properties. Phys Procedia 56:371–378
Wycisk E, Siddique S, Herzog D, Walther F, Emmelmann C (2015) Fatigue performance of laser additive manufactured Ti-6Al-4V in very high cycle fatigue regime up to 109 cycles. Front Mater 2:2117
Xu W, Lui E, Pateras A, Qian M, Brandt M (2017) In-situ tailoring microstructure in additively manufactured Ti-6Al-4V for superior mechanical performance. Acta Mater 125:390–400
Mugwagwa L, Dimitrov D, Matope S, Yadroitsev I (2018) Influence of process parameters on residual stress-related distortions in selective laser melting. Procedia Manuf 21:92–99
Acknowledgements
The authors thank the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) for its financial support within the research project “Mechanism-based understanding of functional grading focused on fatigue behavior of additively processed Ti-6Al-4V and Al-12Si alloys” (WA 1672/25-1).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 The Minerals, Metals & Materials Society
About this paper
Cite this paper
Awd, M., Johannsen, J., Chan, T., Merghany, M., Emmelmann, C., Walther, F. (2020). Improvement of Fatigue Strength in Lightweight Selective Laser Melted Alloys by In-Situ and Ex-Situ Composition and Heat Treatment. In: TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36296-6_11
Download citation
DOI: https://doi.org/10.1007/978-3-030-36296-6_11
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-36295-9
Online ISBN: 978-3-030-36296-6
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)