Evaluation and prediction of pore effects on single-crystal mechanical and damage properties of selective laser melted Inconel-718
Pore defects inescapably occur during the selective laser melting (SLM) process of metallic materials, which are difficult to be eliminated even by advanced process optimizing and post-treatment technologies. Properties of SLM-fabricated materials depend on the influence of pores, while the effect m...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-07-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127522004294 |
| _version_ | 1818243807834013696 |
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| author | Hansong Ji Qinghua Song Runqiong Wang Wentong Cai Zhanqiang Liu |
| author_facet | Hansong Ji Qinghua Song Runqiong Wang Wentong Cai Zhanqiang Liu |
| author_sort | Hansong Ji |
| collection | DOAJ |
| description | Pore defects inescapably occur during the selective laser melting (SLM) process of metallic materials, which are difficult to be eliminated even by advanced process optimizing and post-treatment technologies. Properties of SLM-fabricated materials depend on the influence of pores, while the effect mechanism is not clearly understood. To clarify the pore effects and achieve reliable forecasting, a statistical-theory-based grain-scale simulation work was performed. Taking Inconel-718 as the example, actual pore defects were detected and classified into three types i.e., gas pore, keyhole pore and lack-of-fusion (LOF) pore, which were then fitted by single or multiple ellipsoids. The volume, shape and posture of pores were characterized by independent parameters, and single-pore-included single-crystal simulations were carried out. Furthermore, overall pore effects were divided into single-ellipsoidal effects, sub-pore quantity effects and sub-pore intersection effects, and the influence mechanisms of pore characteristics on the mean tensile strength and the maximum damage driving force were clarified through partial correlation analysis. Eventually, single-crystal mechanical and damage property prediction models for the grain with an internal pore defect were developed and verified, which show good accuracy with 8–22% relative deviation for damage resistance predictions, and show excellent accuracy with lower than 0.3% relative deviation for strength property predictions. |
| first_indexed | 2024-12-12T14:07:00Z |
| format | Article |
| id | doaj.art-68e251248f6e4151a9f444b792722fe0 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-12T14:07:00Z |
| publishDate | 2022-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-68e251248f6e4151a9f444b792722fe02022-12-22T00:22:12ZengElsevierMaterials & Design0264-12752022-07-01219110807Evaluation and prediction of pore effects on single-crystal mechanical and damage properties of selective laser melted Inconel-718Hansong Ji0Qinghua Song1Runqiong Wang2Wentong Cai3Zhanqiang Liu4Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, PR ChinaKey Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, PR China; National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan, PR China; Corresponding author at: Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, PR China.Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, PR ChinaKey Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, PR ChinaKey Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, PR China; National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan, PR ChinaPore defects inescapably occur during the selective laser melting (SLM) process of metallic materials, which are difficult to be eliminated even by advanced process optimizing and post-treatment technologies. Properties of SLM-fabricated materials depend on the influence of pores, while the effect mechanism is not clearly understood. To clarify the pore effects and achieve reliable forecasting, a statistical-theory-based grain-scale simulation work was performed. Taking Inconel-718 as the example, actual pore defects were detected and classified into three types i.e., gas pore, keyhole pore and lack-of-fusion (LOF) pore, which were then fitted by single or multiple ellipsoids. The volume, shape and posture of pores were characterized by independent parameters, and single-pore-included single-crystal simulations were carried out. Furthermore, overall pore effects were divided into single-ellipsoidal effects, sub-pore quantity effects and sub-pore intersection effects, and the influence mechanisms of pore characteristics on the mean tensile strength and the maximum damage driving force were clarified through partial correlation analysis. Eventually, single-crystal mechanical and damage property prediction models for the grain with an internal pore defect were developed and verified, which show good accuracy with 8–22% relative deviation for damage resistance predictions, and show excellent accuracy with lower than 0.3% relative deviation for strength property predictions.http://www.sciencedirect.com/science/article/pii/S0264127522004294PoreSLMGrain-scaleMechanicalDamage |
| spellingShingle | Hansong Ji Qinghua Song Runqiong Wang Wentong Cai Zhanqiang Liu Evaluation and prediction of pore effects on single-crystal mechanical and damage properties of selective laser melted Inconel-718 Materials & Design Pore SLM Grain-scale Mechanical Damage |
| title | Evaluation and prediction of pore effects on single-crystal mechanical and damage properties of selective laser melted Inconel-718 |
| title_full | Evaluation and prediction of pore effects on single-crystal mechanical and damage properties of selective laser melted Inconel-718 |
| title_fullStr | Evaluation and prediction of pore effects on single-crystal mechanical and damage properties of selective laser melted Inconel-718 |
| title_full_unstemmed | Evaluation and prediction of pore effects on single-crystal mechanical and damage properties of selective laser melted Inconel-718 |
| title_short | Evaluation and prediction of pore effects on single-crystal mechanical and damage properties of selective laser melted Inconel-718 |
| title_sort | evaluation and prediction of pore effects on single crystal mechanical and damage properties of selective laser melted inconel 718 |
| topic | Pore SLM Grain-scale Mechanical Damage |
| url | http://www.sciencedirect.com/science/article/pii/S0264127522004294 |
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