{"title":"Controlling heat accumulation through changing time per layer in laser powder bed fusion of nickel-based superalloy","authors":"","doi":"10.1016/j.jmapro.2024.09.001","DOIUrl":null,"url":null,"abstract":"<div><p>Feedforward/feedback control of laser powder bed fusion (L-PBF) was proposed over a decade ago but remains challenging. Despite numerous parameters involved, most studies have attempted to control the process by changing laser power only. On the other hand, previous studies have shown that reducing the time per layer (<span><math><mi>TPL</mi></math></span>) increases the heat accumulation during the process. Thus, this feasibility study aimed to validate <span><math><mi>TPL</mi></math></span> as a potential parameter to control the top surface temperature of a nickel-based superalloy sample during L-PBF. First, a part-scale finite element thermal analysis with feedback control was performed to verify the temperature control strategy. Then, the sample was experimentally fabricated with the temperature control by changing <span><math><mi>TPL</mi></math></span>. The measured temperature was successfully maintained at target values (400, 500, and 700 °C), which were switched every 100 layers. In the as-fabricated IN738LC sample with the temperature control, the cellular microstructures coarsened by more than 0.5 μm and the hardness increased by approximately 50 HV as the target temperature was set higher. While demonstrating the potential of <span><math><mi>TPL</mi></math></span> for temperature control, its limitations in practical manufacturing were also discussed.</p></div>","PeriodicalId":16148,"journal":{"name":"Journal of Manufacturing Processes","volume":null,"pages":null},"PeriodicalIF":6.1000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1526612524009071/pdfft?md5=c68399b7f2fefd3d186e945f2455652a&pid=1-s2.0-S1526612524009071-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Manufacturing Processes","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1526612524009071","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MANUFACTURING","Score":null,"Total":0}
引用次数: 0
Abstract
Feedforward/feedback control of laser powder bed fusion (L-PBF) was proposed over a decade ago but remains challenging. Despite numerous parameters involved, most studies have attempted to control the process by changing laser power only. On the other hand, previous studies have shown that reducing the time per layer () increases the heat accumulation during the process. Thus, this feasibility study aimed to validate as a potential parameter to control the top surface temperature of a nickel-based superalloy sample during L-PBF. First, a part-scale finite element thermal analysis with feedback control was performed to verify the temperature control strategy. Then, the sample was experimentally fabricated with the temperature control by changing . The measured temperature was successfully maintained at target values (400, 500, and 700 °C), which were switched every 100 layers. In the as-fabricated IN738LC sample with the temperature control, the cellular microstructures coarsened by more than 0.5 μm and the hardness increased by approximately 50 HV as the target temperature was set higher. While demonstrating the potential of for temperature control, its limitations in practical manufacturing were also discussed.
期刊介绍:
The aim of the Journal of Manufacturing Processes (JMP) is to exchange current and future directions of manufacturing processes research, development and implementation, and to publish archival scholarly literature with a view to advancing state-of-the-art manufacturing processes and encouraging innovation for developing new and efficient processes. The journal will also publish from other research communities for rapid communication of innovative new concepts. Special-topic issues on emerging technologies and invited papers will also be published.