Influence of base plate preheating temperature on fatigue strength of AISI 4140 manufactured by laser powder bed fusion
This study investigates the influence of base plate preheating temperature on the fatigue performance of additively manufactured AISI 4140 steel, manufactured through laser powder bed fusion (PBF-LB). By varying preheating temperatures (150°C, 300°C, and 450°C), distinct microstructures – martensiti...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425000730 |
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| author | Philipp Schüßler Benjamin Dollhofer Christian Krämer Lukas Englert Frauke Hinrichs Volker Schulze Stefan Dietrich |
| author_facet | Philipp Schüßler Benjamin Dollhofer Christian Krämer Lukas Englert Frauke Hinrichs Volker Schulze Stefan Dietrich |
| author_sort | Philipp Schüßler |
| collection | DOAJ |
| description | This study investigates the influence of base plate preheating temperature on the fatigue performance of additively manufactured AISI 4140 steel, manufactured through laser powder bed fusion (PBF-LB). By varying preheating temperatures (150°C, 300°C, and 450°C), distinct microstructures – martensitic, mixed martensitic-bainitic, and fully bainitic – were achieved, each influencing fatigue strength and toughness. The results show that a fully martensitic structure provides superior fatigue resistance, while the mixed microstructure batch displayed reduced toughness and fatigue strength due to tempered martensite embrittlement (TME), which occurred at lower hardness compared to conventionally treated steels. However, the fully bainitic batch exhibited the highest toughness and a fatigue resistance between the two other batches, confirming that bainitic autotempering occurs at elevated temperatures, without evidence of embrittlement. Additionally, inherent porosity in AM samples acted as a stress concentrator, further reducing fatigue performance. This study highlights the importance of optimizing the base plate preheating temperature to control microstructure and porosity for enhanced fatigue performance in additively manufactured AISI 4140 components. |
| format | Article |
| id | doaj-art-15a7db3aedb444aaae2a60c08a0c33d9 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-15a7db3aedb444aaae2a60c08a0c33d92025-01-22T05:42:34ZengElsevierJournal of Materials Research and Technology2238-78542025-03-013513581368Influence of base plate preheating temperature on fatigue strength of AISI 4140 manufactured by laser powder bed fusionPhilipp Schüßler0Benjamin Dollhofer1Christian Krämer2Lukas Englert3Frauke Hinrichs4Volker Schulze5Stefan Dietrich6Corresponding author.; Institute for Applied Materials - Materials Science and Engineering (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe, 76131, GermanyInstitute for Applied Materials - Materials Science and Engineering (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe, 76131, GermanyInstitute for Applied Materials - Materials Science and Engineering (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe, 76131, GermanyInstitute for Applied Materials - Materials Science and Engineering (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe, 76131, GermanyInstitute for Applied Materials - Materials Science and Engineering (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe, 76131, GermanyInstitute for Applied Materials - Materials Science and Engineering (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe, 76131, GermanyInstitute for Applied Materials - Materials Science and Engineering (IAM-WK), Karlsruhe Institute of Technology (KIT), Karlsruhe, 76131, GermanyThis study investigates the influence of base plate preheating temperature on the fatigue performance of additively manufactured AISI 4140 steel, manufactured through laser powder bed fusion (PBF-LB). By varying preheating temperatures (150°C, 300°C, and 450°C), distinct microstructures – martensitic, mixed martensitic-bainitic, and fully bainitic – were achieved, each influencing fatigue strength and toughness. The results show that a fully martensitic structure provides superior fatigue resistance, while the mixed microstructure batch displayed reduced toughness and fatigue strength due to tempered martensite embrittlement (TME), which occurred at lower hardness compared to conventionally treated steels. However, the fully bainitic batch exhibited the highest toughness and a fatigue resistance between the two other batches, confirming that bainitic autotempering occurs at elevated temperatures, without evidence of embrittlement. Additionally, inherent porosity in AM samples acted as a stress concentrator, further reducing fatigue performance. This study highlights the importance of optimizing the base plate preheating temperature to control microstructure and porosity for enhanced fatigue performance in additively manufactured AISI 4140 components.http://www.sciencedirect.com/science/article/pii/S2238785425000730Laser powder bed fusionAdditive manufacturingAISI 414042CrMo4FatigueMechanical properties |
| spellingShingle | Philipp Schüßler Benjamin Dollhofer Christian Krämer Lukas Englert Frauke Hinrichs Volker Schulze Stefan Dietrich Influence of base plate preheating temperature on fatigue strength of AISI 4140 manufactured by laser powder bed fusion Journal of Materials Research and Technology Laser powder bed fusion Additive manufacturing AISI 4140 42CrMo4 Fatigue Mechanical properties |
| title | Influence of base plate preheating temperature on fatigue strength of AISI 4140 manufactured by laser powder bed fusion |
| title_full | Influence of base plate preheating temperature on fatigue strength of AISI 4140 manufactured by laser powder bed fusion |
| title_fullStr | Influence of base plate preheating temperature on fatigue strength of AISI 4140 manufactured by laser powder bed fusion |
| title_full_unstemmed | Influence of base plate preheating temperature on fatigue strength of AISI 4140 manufactured by laser powder bed fusion |
| title_short | Influence of base plate preheating temperature on fatigue strength of AISI 4140 manufactured by laser powder bed fusion |
| title_sort | influence of base plate preheating temperature on fatigue strength of aisi 4140 manufactured by laser powder bed fusion |
| topic | Laser powder bed fusion Additive manufacturing AISI 4140 42CrMo4 Fatigue Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425000730 |
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