@article{57540, abstract = {{AbstractRolling processes of conventional cast Al-Li alloys quickly reach their limits due to relatively poor material formability. This can be overcome by using twin-roll casting to produce thin sheets. Further thermomechanical treatment, including hot or cold rolling, and heat treatment can adjust the mechanical properties of twin-roll cast Al-Li sheets. The whole manufacturing chain requires detailed knowledge of the precipitation and dissolution behavior during heating, soaking and cooling, to purposefully select any process parameters. This study shows the process chain of a twin-roll cast Al–Cu–Li alloy achieving a hardness of around 180 HV1 by adapting the heat treatment parameters for homogenisation, hot rolling and age hardening. Both hardness and microstructure evolution are visualised along the process chain.}}, author = {{Mallow, Sina and Broer, Jette and Milkereit, Benjamin and Grydin, Olexandr and Hoyer, Kay-Peter and Garthe, Kai-Uwe and Milaege, Dennis and Boyko, Viktoriya and Schaper, Mirko and Kessler, Olaf}}, issn = {{0944-6524}}, journal = {{Production Engineering}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Process chain of a twin-roll cast aluminium-copper-lithium alloy}}}, doi = {{10.1007/s11740-024-01322-x}}, year = {{2024}}, } @inbook{41959, author = {{Grydin, Olexandr and Garthe, Kai-Uwe and Yuan, Xueyang and Broer, Jette and Keßler, Olaf and Králík, Rostislav and Cieslar, Miroslav and Schaper, Mirko}}, booktitle = {{Light Metals 2023}}, editor = {{Broek, Stephan}}, isbn = {{9783031225314}}, issn = {{2367-1181}}, pages = {{1031--1037}}, publisher = {{Springer Nature Switzerland}}, title = {{{Numerical and Experimental Investigation of Twin-Roll Casting of Aluminum–Lithium Strips}}}, doi = {{10.1007/978-3-031-22532-1_137}}, year = {{2023}}, } @article{41507, abstract = {{ Purpose The currently existing restrictions regarding the deployment of additively manufactured components because of poor surface roughness, porosity and residual stresses as well as their influence on the low-cycle fatigue (LCF) strength are addressed in this paper. Design/methodology/approach This study aims to evaluating the effect of different pre- and post-treatments on the LCF strength of additively manufactured 316L parts. Therefore, 316L specimens manufactured by laser powder bed fusion were examined in their as-built state as well as after grinding, or coating with regard to the surface roughness, residual stresses and LCF strength. To differentiate between topographical effects and residual stress-related phenomena, stress-relieved 316L specimens served as a reference throughout the investigations. To enable an alumina coating of the 316L components, atmospheric plasma spraying was used, and the near-surface residual stresses and the surface roughness are measured and investigated. Findings The results have shown that the applied pre- and post-treatments such as stress-relief heat treatment, grinding and alumina coating have each led to an increase in LCF strength of the 316L specimens. In contrast, the non-heat-treated specimens predominantly exhibited coating delamination. Originality/value To the best of the authors’ knowledge, this is the first study of the correlation between the LCF behavior of additively manufactured uncoated 316L specimens in comparison with additively manufactured 316L specimens with an alumina coating. }}, author = {{Garthe, Kai-Uwe and Hoyer, Kay-Peter and Hagen, Leif and Tillmann, Wolfgang and Schaper, Mirko}}, issn = {{1355-2546}}, journal = {{Rapid Prototyping Journal}}, keywords = {{Industrial and Manufacturing Engineering, Mechanical Engineering}}, number = {{5}}, pages = {{833--840}}, publisher = {{Emerald}}, title = {{{Correlation between pre- and post-treatments of additively manufactured 316L parts and the resulting low cycle fatigue behavior}}}, doi = {{10.1108/rpj-01-2021-0017}}, volume = {{28}}, year = {{2021}}, } @article{27509, abstract = {{ Purpose The currently existing restrictions regarding the deployment of additively manufactured components because of poor surface roughness, porosity and residual stresses as well as their influence on the low-cycle fatigue (LCF) strength are addressed in this paper. Design/methodology/approach This study aims to evaluating the effect of different pre- and post-treatments on the LCF strength of additively manufactured 316L parts. Therefore, 316L specimens manufactured by laser powder bed fusion were examined in their as-built state as well as after grinding, or coating with regard to the surface roughness, residual stresses and LCF strength. To differentiate between topographical effects and residual stress-related phenomena, stress-relieved 316L specimens served as a reference throughout the investigations. To enable an alumina coating of the 316L components, atmospheric plasma spraying was used, and the near-surface residual stresses and the surface roughness are measured and investigated. Findings The results have shown that the applied pre- and post-treatments such as stress-relief heat treatment, grinding and alumina coating have each led to an increase in LCF strength of the 316L specimens. In contrast, the non-heat-treated specimens predominantly exhibited coating delamination. Originality/value To the best of the authors’ knowledge, this is the first study of the correlation between the LCF behavior of additively manufactured uncoated 316L specimens in comparison with additively manufactured 316L specimens with an alumina coating. }}, author = {{Garthe, Kai-Uwe and Hoyer, Kay-Peter and Hagen, Leif and Tillmann, Wolfgang and Schaper, Mirko}}, issn = {{1355-2546}}, journal = {{Rapid Prototyping Journal}}, title = {{{Correlation between pre- and post-treatments of additively manufactured 316L parts and the resulting low cycle fatigue behavior}}}, doi = {{10.1108/rpj-01-2021-0017}}, year = {{2021}}, } @article{41519, abstract = {{AbstractDifferent studies have been demonstrated that the surface integrity of substrate bulk materials to be coated has a significant impact on the adhesion of thermally sprayed coatings. It is known that the surface integrity of parts processed by selective laser melting (SLM) differs from those obtained from bulk materials. Although 316L stainless steel is among the most investigated material for SLM, the adhesion of thermally sprayed coatings on 316L stainless steel substrates processed by SLM has not been studied yet. This study aims at evaluating the effect of various mechanical pre-treatments onto 316L stainless steel substrates processed by SLM and their effect on the adhesion of high velocity oxy-fuel (HVOF)-sprayed WC-Co coatings. To differentiate between topographical effects and residual stress-related phenomena, a stress-relief heat treatment of the SLM substrates served as a reference throughout the investigations. The differently pre-treated SLM substrates were investigated with regard to the surface roughness and residual stresses. For the HVOF-sprayed SLM composites, Vickers interfacial indentation tests were conducted to assess the resulting coating adhesion. The findings demonstrated that the HVOF-sprayed WC-Co coatings predominantly exhibit good adhesion to the SLM 316L substrates. However, it was found that the stress state in the SLM 316L substrate surface is more likely to affect the adhesion of the WC-Co coating, while the substrate surface roughness showed a marginal effect.}}, author = {{Tillmann, Wolfgang and Hagen, Leif and Schaak, Christoph and Liß, J. and Schaper, Mirko and Hoyer, Kay-Peter and Aydinöz, Mehmet Esat and Garthe, Kai-Uwe}}, issn = {{1059-9630}}, journal = {{Journal of Thermal Spray Technology}}, keywords = {{Materials Chemistry, Surfaces, Coatings and Films, Condensed Matter Physics}}, number = {{6}}, pages = {{1396--1409}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Adhesion of HVOF-Sprayed WC-Co Coatings on 316L Substrates Processed by SLM}}}, doi = {{10.1007/s11666-020-01081-y}}, volume = {{29}}, year = {{2020}}, } @article{41518, author = {{Tillmann, Wolfgang and Hagen, Leif and Garthe, Kai-Uwe and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0933-5137}}, journal = {{Materialwissenschaft und Werkstofftechnik}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}}, number = {{11}}, pages = {{1452--1464}}, publisher = {{Wiley}}, title = {{{Effect of substrate pre‐treatment on the low cycle fatigue performance of tungsten carbide‐cobalt coated additive manufactured 316 L substrates}}}, doi = {{10.1002/mawe.202000109}}, volume = {{51}}, year = {{2020}}, } @article{24254, author = {{Tillmann, Wolfgang and Hagen, Leif and Garthe, Kai-Uwe and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0933-5137}}, journal = {{Materialwissenschaft und Werkstofftechnik}}, pages = {{1452--1464}}, title = {{{Effect of substrate pre‐treatment on the low cycle fatigue performance of tungsten carbide‐cobalt coated additive manufactured 316 L substrates}}}, doi = {{10.1002/mawe.202000109}}, year = {{2020}}, } @article{24092, abstract = {{AbstractDifferent studies have been demonstrated that the surface integrity of substrate bulk materials to be coated has a significant impact on the adhesion of thermally sprayed coatings. It is known that the surface integrity of parts processed by selective laser melting (SLM) differs from those obtained from bulk materials. Although 316L stainless steel is among the most investigated material for SLM, the adhesion of thermally sprayed coatings on 316L stainless steel substrates processed by SLM has not been studied yet. This study aims at evaluating the effect of various mechanical pre-treatments onto 316L stainless steel substrates processed by SLM and their effect on the adhesion of high velocity oxy-fuel (HVOF)-sprayed WC-Co coatings. To differentiate between topographical effects and residual stress-related phenomena, a stress-relief heat treatment of the SLM substrates served as a reference throughout the investigations. The differently pre-treated SLM substrates were investigated with regard to the surface roughness and residual stresses. For the HVOF-sprayed SLM composites, Vickers interfacial indentation tests were conducted to assess the resulting coating adhesion. The findings demonstrated that the HVOF-sprayed WC-Co coatings predominantly exhibit good adhesion to the SLM 316L substrates. However, it was found that the stress state in the SLM 316L substrate surface is more likely to affect the adhesion of the WC-Co coating, while the substrate surface roughness showed a marginal effect.}}, author = {{Tillmann, Wolfgang and Hagen, Leif and Schaak, Christopher and Liß, Jan and Schaper, Mirko and Hoyer, Kay-Peter and Aydinöz, Mehmet Esat and Garthe, Kai-Uwe}}, issn = {{1059-9630}}, journal = {{Journal of Thermal Spray Technology}}, pages = {{1396--1409}}, title = {{{Adhesion of HVOF-Sprayed WC-Co Coatings on 316L Substrates Processed by SLM}}}, doi = {{10.1007/s11666-020-01081-y}}, year = {{2020}}, } @article{24255, abstract = {{AbstractDifferent studies have been demonstrated that the surface integrity of substrate bulk materials to be coated has a significant impact on the adhesion of thermally sprayed coatings. It is known that the surface integrity of parts processed by selective laser melting (SLM) differs from those obtained from bulk materials. Although 316L stainless steel is among the most investigated material for SLM, the adhesion of thermally sprayed coatings on 316L stainless steel substrates processed by SLM has not been studied yet. This study aims at evaluating the effect of various mechanical pre-treatments onto 316L stainless steel substrates processed by SLM and their effect on the adhesion of high velocity oxy-fuel (HVOF)-sprayed WC-Co coatings. To differentiate between topographical effects and residual stress-related phenomena, a stress-relief heat treatment of the SLM substrates served as a reference throughout the investigations. The differently pre-treated SLM substrates were investigated with regard to the surface roughness and residual stresses. For the HVOF-sprayed SLM composites, Vickers interfacial indentation tests were conducted to assess the resulting coating adhesion. The findings demonstrated that the HVOF-sprayed WC-Co coatings predominantly exhibit good adhesion to the SLM 316L substrates. However, it was found that the stress state in the SLM 316L substrate surface is more likely to affect the adhesion of the WC-Co coating, while the substrate surface roughness showed a marginal effect.}}, author = {{Tillmann, W. and Hagen, L. and Schaak, C. and Liß, J. and Schaper, Mirko and Hoyer, Kay-Peter and Aydinöz, M. E. and Garthe, Kai-Uwe}}, issn = {{1059-9630}}, journal = {{Journal of Thermal Spray Technology}}, pages = {{1396--1409}}, title = {{{Adhesion of HVOF-Sprayed WC-Co Coatings on 316L Substrates Processed by SLM}}}, doi = {{10.1007/s11666-020-01081-y}}, year = {{2020}}, } @article{24091, author = {{Tillmann, Wolfgang and Hagen, Leif and Garthe, Kai-Uwe and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0933-5137}}, journal = {{Materialwissenschaft und Werkstofftechnik}}, pages = {{1452--1464}}, title = {{{Effect of substrate pre‐treatment on the low cycle fatigue performance of tungsten carbide‐cobalt coated additive manufactured 316 L substrates}}}, doi = {{10.1002/mawe.202000109}}, year = {{2020}}, }