Suppressing cold cracking in laser powder bed fused Al-Fe-V-Si alloy using top-hat laser profile

doi:10.1016/j.msea.2025.147858

IMR OpenIR

	Suppressing cold cracking in laser powder bed fused Al-Fe-V-Si alloy using top-hat laser profile
	Wei, Siyuan 1; Huang, Sheng 2; Ng, Sarah Jiawen 2; Zhang, Long 3; Zeng, Yingzhi 4; Wang, Pei 1,5; Ramamurty, Upadrasta 1,2
通讯作者	Wei, Siyuan(wei_siyuan@imre.a-star.edu.sg) ; Huang, Sheng(sheng007@e.ntu.edu.sg) ; Wang, Pei(wangp@imre.a-star.edu.sg)
	2025-02-01
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	924 页码:12
摘要	Dispersion-strengthened Al-Fe-V-Si alloy that has high temperature applicability was additively manufactured using the laser powder bed fusion (LPBF) technique with both Gaussian and top-hat laser profiles. The fabricated samples were investigated through multiscale microstructural characterization, hardness mapping, and bulk mechanical testing. The Gaussian laser induced severe cold cracking along the melt pool boundaries, even with extensive parameter optimization and substrate pre-heating up to 200 degrees C. In contrast, the top-hat laser effectively suppressed cold cracking, producing nearly fully dense samples with only 110 degrees C preheating. Transmission electron microscopy analysis identified fine Al12(Fe,V)3Si and coarse h-AlFeSi precipitates in the built part, which were not predicted by the equilibrium and Scheil-Gulliver thermodynamic models, indicating non-equilibrium conditions and complexity in their formation. The brittle coarse precipitates along the melt pool boundaries were identified to be the key cause of cold cracking in the Gaussian laser samples, creating a hardness mismatch between the melt pool boundary and the interior. The top-hat laser created a large heat-affected zone that spanned more than one layer thickness, effectively achieving in-situ "substrate" preheating, which contributed to crack mitigation.
关键词	Cold cracking Al alloys Top-hat laser Additive manufacturing Precipitation
资助者	Sinoma Institute of Mate-rials Research
DOI	10.1016/j.msea.2025.147858
收录类别	SCI
语种	英语
资助项目	Sinoma Institute of Mate-rials Research[M22K4a0044]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001402808000001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/180367
专题	中国科学院金属研究所
通讯作者	Wei, Siyuan; Huang, Sheng; Wang, Pei
作者单位	1.ASTAR, Inst Mat Res & Engn IMRE, 2 Fusionopolis Way,Innovis 08-03, Singapore 138634, Singapore 2.Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore 3.Chinese Acad Sci, Inst Met Res, Shi changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 4.ASTAR, Inst High Performance Comp IHPC, 1 Fusionopolis Way,Connexis 16-16, Singapore 138632, Singapore 5.Singapore Inst Technol, Engn Cluster, Singapore 519961, Singapore
推荐引用方式 GB/T 7714	Wei, Siyuan,Huang, Sheng,Ng, Sarah Jiawen,et al. Suppressing cold cracking in laser powder bed fused Al-Fe-V-Si alloy using top-hat laser profile[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2025,924:12.
APA	Wei, Siyuan.,Huang, Sheng.,Ng, Sarah Jiawen.,Zhang, Long.,Zeng, Yingzhi.,...&Ramamurty, Upadrasta.(2025).Suppressing cold cracking in laser powder bed fused Al-Fe-V-Si alloy using top-hat laser profile.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,924,12.
MLA	Wei, Siyuan,et al."Suppressing cold cracking in laser powder bed fused Al-Fe-V-Si alloy using top-hat laser profile".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 924(2025):12.