Influence of magnetically constricted arc traverse speed (MCATS) on tensile properties and microstructural characteristics of welded Inconel 718 alloy sheets  

作　　者：Tushar Sonar Visvalingam Balasubramanian Sudersanan Malarvizhi Thiruvenkatam Venkateswaran Dhenuvakonda Sivakumar 

机构地区：[1]Centre for Materials Joining and Research(CEMAJOR),Department of Manufacturing Engineering,Annamalai University,Annamalai Nagar,608002,Tamilnadu State,India [2]Heat Treatment and Welding Metallurgy Division(HWMD),Materials and Metallurgy Group(MMG),Vikram Sarabhai Space Centre(VSSC),ISRO,Thiruvananthpuram,695022,Kerala State,India

出　　处：《Defence Technology（防务技术）》2021年第4期1395-1413,共19页Defence Technology

基　　金：funded by Indian Space Research Organization (ISRO) India. Project No. ISRO/RES/3/728/16e17

摘　　要：The magnetically constricted arc technique was implemented to mitigate the heat input related metallurgical problems in Gas Tungsten Arc Welding(GTAW)of Inconel 718 alloy particularly Nb segregation and subsequent laves phase evolution in fusion zone.This paper reports the direct effect of magnetically constricted arc traverse speed(MCATS)on bead profile,tensile properties and microstructural evolution of Inconel 718 alloy sheets joined by Gas Tungsten Constricted Arc Welding(GTCAW)process.The mechanism amenable for the microstructural modification and corresponding influence on the tensile properties of joints is investigated both in qualitative and quantitative manner related to the mechanics of arc constriction and pulsing.It is correlated to the solidification conditions during welding.The relationship between MCATS and Arc Constriction Current(ACC)was derived.Its interaction effect on the magnetic arc constriction and joint performance was analysed.Results showed that the joints fabricated using CATS of 70 mm/min exhibited superior tensile properties(98.39% of base metal strength with 31.50% elongation).It is attributed to the grain refinement in fusion zone microstructure leading to the evolution of finer,discrete laves phase in interdendritic areas.

关 键 词：GTCA welding Inconel 718 alloy Magnetically constricted arc traverse speed Tensile properties Microstructure Laves phase 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG444.74[金属学及工艺—合金]