{"title":"Multi-objective optimization and fracture analysis of laser weld joints of Ni-Cr superalloy 80 A for gas turbine components","authors":"Suman Kumar Saurabh, Prabha Chand, Umacharan Singh Yadav","doi":"10.1007/s12206-024-0822-5","DOIUrl":null,"url":null,"abstract":"<p>This article addresses butt joining of 1.2 mm thick Ni-Cr superalloy 80 A sheets using a 3.5 kW CO<sub>2</sub> laser beam welding (LBW) process, which is critical for gas turbine components, nuclear tube supports and automotive valves in high temperature applications. LBW, chosen for its low heat input and minimal heat-affected zones, was optimized using Taguchi-based gray relationship analysis. The L9 orthogonal array experiment identified the optimal parameter sets for welding speed, laser power, focal length, and shielding gas flow rate that affect tensile strength, microhardness, penetration depth and weld bead. The results were validated using ANOVA analysis, fractography, hardness testing, micrographs and tensile tests. Microstructural variations in fusion and heat affected zones. The optimized parameters resulted in a tensile strength of 817 MPa and a microhardness of 292 HV, demonstrating improved weld quality.</p>","PeriodicalId":16235,"journal":{"name":"Journal of Mechanical Science and Technology","volume":null,"pages":null},"PeriodicalIF":1.5000,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Mechanical Science and Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s12206-024-0822-5","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
This article addresses butt joining of 1.2 mm thick Ni-Cr superalloy 80 A sheets using a 3.5 kW CO2 laser beam welding (LBW) process, which is critical for gas turbine components, nuclear tube supports and automotive valves in high temperature applications. LBW, chosen for its low heat input and minimal heat-affected zones, was optimized using Taguchi-based gray relationship analysis. The L9 orthogonal array experiment identified the optimal parameter sets for welding speed, laser power, focal length, and shielding gas flow rate that affect tensile strength, microhardness, penetration depth and weld bead. The results were validated using ANOVA analysis, fractography, hardness testing, micrographs and tensile tests. Microstructural variations in fusion and heat affected zones. The optimized parameters resulted in a tensile strength of 817 MPa and a microhardness of 292 HV, demonstrating improved weld quality.
期刊介绍：
The aim of the Journal of Mechanical Science and Technology is to provide an international forum for the publication and dissemination of original work that contributes to the understanding of the main and related disciplines of mechanical engineering, either empirical or theoretical. The Journal covers the whole spectrum of mechanical engineering, which includes, but is not limited to, Materials and Design Engineering, Production Engineering and Fusion Technology, Dynamics, Vibration and Control, Thermal Engineering and Fluids Engineering.
Manuscripts may fall into several categories including full articles, solicited reviews or commentary, and unsolicited reviews or commentary related to the core of mechanical engineering.
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