Donghua Dai , Zhiheng Xia , Yuhang Long , Han Zhang , Jianye Liu , Zhenghua Huang , Keyu Shi
{"title":"Improved surface quality components enabled by dual-laser additive/subtractive hybrid manufacturing process: Thermal behavior and ablation mechanisms","authors":"Donghua Dai , Zhiheng Xia , Yuhang Long , Han Zhang , Jianye Liu , Zhenghua Huang , Keyu Shi","doi":"10.1016/j.optlastec.2024.112147","DOIUrl":null,"url":null,"abstract":"<div><div>A high roughness of the laser powder bed fusion (LPBF) process has been one of the most concerned issues in the integrated fabrication of complicated metal parts. In this research, a dual (continuous and ultrafast) laser additive-subtractive hybrid manufacturing (LASHM) process is introduced to improve the surface quality of the LPBF-processed components. Effects of the laser subtractive times and the feed rates on the side surface morphology of the LASHM-processed AISI 316L components were studied. Meanwhile, the VOF transient physical model of LPBF and double temperature physical model of LASHM were established to investigate the individual thermal behaviors and the material melting-ablation mechanisms. For the LPBF process, the operating temperature of the molten pool bottom was firstly stable in 300 K (< 25 ms), then increased to 630 K (25 ms-35 ms) and finally exponentially increased to 3000 K (>35 ms), implying the delayed thermal effect. Meanwhile, the operating temperature of the top region was linearly increased to 2050 K. While for the ultrafast laser subtractive process, the operating temperature of the top region was remained at ∼ 300 K with the temperature rapid increase to 2900 K below 10<sup>4</sup> ps in the bottom region, leading to the direct material ablation and maintaining the LPBF-processed microstructure. At the laser subtractive times equal to four with the sequence feed rates of 10 μm, 10 μm, 8 μm and 6 μm, the surface roughness Sa and the maximum surface height difference Sz were considerably reduced from 10.774 μm and 73.387 μm to 1.933 μm and 18.151 μm.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"182 ","pages":"Article 112147"},"PeriodicalIF":4.6000,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics and Laser Technology","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0030399224016050","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
A high roughness of the laser powder bed fusion (LPBF) process has been one of the most concerned issues in the integrated fabrication of complicated metal parts. In this research, a dual (continuous and ultrafast) laser additive-subtractive hybrid manufacturing (LASHM) process is introduced to improve the surface quality of the LPBF-processed components. Effects of the laser subtractive times and the feed rates on the side surface morphology of the LASHM-processed AISI 316L components were studied. Meanwhile, the VOF transient physical model of LPBF and double temperature physical model of LASHM were established to investigate the individual thermal behaviors and the material melting-ablation mechanisms. For the LPBF process, the operating temperature of the molten pool bottom was firstly stable in 300 K (< 25 ms), then increased to 630 K (25 ms-35 ms) and finally exponentially increased to 3000 K (>35 ms), implying the delayed thermal effect. Meanwhile, the operating temperature of the top region was linearly increased to 2050 K. While for the ultrafast laser subtractive process, the operating temperature of the top region was remained at ∼ 300 K with the temperature rapid increase to 2900 K below 104 ps in the bottom region, leading to the direct material ablation and maintaining the LPBF-processed microstructure. At the laser subtractive times equal to four with the sequence feed rates of 10 μm, 10 μm, 8 μm and 6 μm, the surface roughness Sa and the maximum surface height difference Sz were considerably reduced from 10.774 μm and 73.387 μm to 1.933 μm and 18.151 μm.
期刊介绍:
Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication.
The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas:
•development in all types of lasers
•developments in optoelectronic devices and photonics
•developments in new photonics and optical concepts
•developments in conventional optics, optical instruments and components
•techniques of optical metrology, including interferometry and optical fibre sensors
•LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow
•applications of lasers to materials processing, optical NDT display (including holography) and optical communication
•research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume)
•developments in optical computing and optical information processing
•developments in new optical materials
•developments in new optical characterization methods and techniques
•developments in quantum optics
•developments in light assisted micro and nanofabrication methods and techniques
•developments in nanophotonics and biophotonics
•developments in imaging processing and systems