{"title":"激光粉末床熔融制造模具中的线状分布孔隙:高压压铸模具失效的关键因素","authors":"Xin He , Corey Vian , Xiaoming Wang","doi":"10.1016/j.jmatprotec.2024.118480","DOIUrl":null,"url":null,"abstract":"<div><p>Additive manufacturing technologies, such as laser powder bed fusion (LPBF), have attracted a significant amount of attention for their capability in fabricating components of complex geometries with improved efficiency and design flexibility. However, the presence of pores in additively manufactured high pressure die casting dies has emerged as a critical issue affecting the performance and reliability of the dies. A numerical model for the formation of pores due to the instability of the keyhole and molten pool in a 18Ni300 steel is created. Computational fluid dynamic (CFD) simulation revealed that the keyhole in the molten pool undergoes inward ebbing and is wrapped by the liquid interface behind the laser beam, forming gas bubbles along the laser tracks. Some of the bubbles will either coalesce or breakup in remelting by the laser beam above in building the next layer forming a string of pores along the LPBF build direction, while others remain unchanged. The line distributed pores are the primary sites for cracking, and the cracks grow along the LPBF build direction. As a result, these longitudinal cracks cause the premature failure of dies with conformal cooling channels (CCC).</p></div>","PeriodicalId":367,"journal":{"name":"Journal of Materials Processing Technology","volume":null,"pages":null},"PeriodicalIF":6.7000,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Line distributed pores in laser powder bed fusion manufactured dies: A critical factor in die failure for high pressure die casting\",\"authors\":\"Xin He , Corey Vian , Xiaoming Wang\",\"doi\":\"10.1016/j.jmatprotec.2024.118480\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Additive manufacturing technologies, such as laser powder bed fusion (LPBF), have attracted a significant amount of attention for their capability in fabricating components of complex geometries with improved efficiency and design flexibility. However, the presence of pores in additively manufactured high pressure die casting dies has emerged as a critical issue affecting the performance and reliability of the dies. A numerical model for the formation of pores due to the instability of the keyhole and molten pool in a 18Ni300 steel is created. Computational fluid dynamic (CFD) simulation revealed that the keyhole in the molten pool undergoes inward ebbing and is wrapped by the liquid interface behind the laser beam, forming gas bubbles along the laser tracks. Some of the bubbles will either coalesce or breakup in remelting by the laser beam above in building the next layer forming a string of pores along the LPBF build direction, while others remain unchanged. The line distributed pores are the primary sites for cracking, and the cracks grow along the LPBF build direction. As a result, these longitudinal cracks cause the premature failure of dies with conformal cooling channels (CCC).</p></div>\",\"PeriodicalId\":367,\"journal\":{\"name\":\"Journal of Materials Processing Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.7000,\"publicationDate\":\"2024-06-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Materials Processing Technology\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0924013624001985\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, INDUSTRIAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Processing Technology","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0924013624001985","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, INDUSTRIAL","Score":null,"Total":0}
Line distributed pores in laser powder bed fusion manufactured dies: A critical factor in die failure for high pressure die casting
Additive manufacturing technologies, such as laser powder bed fusion (LPBF), have attracted a significant amount of attention for their capability in fabricating components of complex geometries with improved efficiency and design flexibility. However, the presence of pores in additively manufactured high pressure die casting dies has emerged as a critical issue affecting the performance and reliability of the dies. A numerical model for the formation of pores due to the instability of the keyhole and molten pool in a 18Ni300 steel is created. Computational fluid dynamic (CFD) simulation revealed that the keyhole in the molten pool undergoes inward ebbing and is wrapped by the liquid interface behind the laser beam, forming gas bubbles along the laser tracks. Some of the bubbles will either coalesce or breakup in remelting by the laser beam above in building the next layer forming a string of pores along the LPBF build direction, while others remain unchanged. The line distributed pores are the primary sites for cracking, and the cracks grow along the LPBF build direction. As a result, these longitudinal cracks cause the premature failure of dies with conformal cooling channels (CCC).
期刊介绍:
The Journal of Materials Processing Technology covers the processing techniques used in manufacturing components from metals and other materials. The journal aims to publish full research papers of original, significant and rigorous work and so to contribute to increased production efficiency and improved component performance.
Areas of interest to the journal include:
• Casting, forming and machining
• Additive processing and joining technologies
• The evolution of material properties under the specific conditions met in manufacturing processes
• Surface engineering when it relates specifically to a manufacturing process
• Design and behavior of equipment and tools.