{"title":"On the melt pool flow and interface shape of dissimilar alloys via selective laser melting","authors":"Liming Yao , Zhongmin Xiao , Aditya Ramesh , Yanmei Zhang","doi":"10.1016/j.icheatmasstransfer.2023.106833","DOIUrl":null,"url":null,"abstract":"<div><p><span>A simulation model is established to describe the micron-scale flow of dissimilar alloys between IN625 and 316 L. The accuracy of the model has been verified through experiments. It is found that the Marangoni force and the </span>recoil pressure<span><span> are 6.28 and 58.51 times the surface tension, respectively. Marangoni force, recoil pressure, and surface tension are the key factors influencing the melt-pool convection and shape. When the laser power is increased, the recoil pressure forms a deep keyhole which leads to a rapid increase in the melt-pool depth. The interlayer interface is changed from a weakly staggered shape to a regularly and remarkably staggered and overlapping shape. The specific surface area growth rate (SAR) is increased by as much as 10 times. The Marangoni force, </span>inertial force and surface tension dominate the single-track surface hump formation. When the depth and width of the melt pool are small and the length is large, the inertial force of the melt is significant, and irregular humps are formed on the single-track surface. The formed humps and the SAR substantially increase the bonding strength between the two dissimilar alloys.</span></p></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"145 ","pages":"Article 106833"},"PeriodicalIF":6.4000,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Communications in Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0735193323002221","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}
引用次数: 4
Abstract
A simulation model is established to describe the micron-scale flow of dissimilar alloys between IN625 and 316 L. The accuracy of the model has been verified through experiments. It is found that the Marangoni force and the recoil pressure are 6.28 and 58.51 times the surface tension, respectively. Marangoni force, recoil pressure, and surface tension are the key factors influencing the melt-pool convection and shape. When the laser power is increased, the recoil pressure forms a deep keyhole which leads to a rapid increase in the melt-pool depth. The interlayer interface is changed from a weakly staggered shape to a regularly and remarkably staggered and overlapping shape. The specific surface area growth rate (SAR) is increased by as much as 10 times. The Marangoni force, inertial force and surface tension dominate the single-track surface hump formation. When the depth and width of the melt pool are small and the length is large, the inertial force of the melt is significant, and irregular humps are formed on the single-track surface. The formed humps and the SAR substantially increase the bonding strength between the two dissimilar alloys.
期刊介绍:
International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.