Improvement of Microstructure and Mechanical Behavior of Gas Tungsten Arc Weldments of Alloy C-276 by Current Pulsing

查看全文 作　　者：[1]M.Manikandan;[1]N.Arivazhagan;M.Nageswara [1]Rao;G.Madhusudhan [2]Reddy

机构地区：[1]School of Mechanical and Building Sciences,VIT University;[2]Defence Metallurgical and Research Laboratory

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2015年第28卷第2期,共8页

基　　金：supported by the Defence Research Development organization (DRDO) (No. ERIP/ ER/1103952/M/01/1403);Department of Science and Technology for the funding received from them under the FIST programme 摘　　要：Superalloy C-276 is known to be prone to hot cracking during fusion welding by Gas Tungsten Arc method.Microsegregation occurring during cooling of fusion zone with consequent appearance of topologically close-packed phases P and l has been held responsible for the observed hot cracking. The present work investigated the possibility of suppressing the microsegregation in weldments by resorting to current pulse. Weldments were made by continuous current gas tungsten arc welding and pulsed current gas tungsten arc welding using ERNi Cr Mo-4 filler wire. The weld joints were studied with respect to microstructure, microsegregation, and mechanical properties. Optical microscopy and scanning electron microscopy were employed to study the microstructure. Energy-Dispersive X-ray Spectroscopy was carried out to evaluate the extent of microsegregation. Tensile testing was carried out to determine the strength and ductility. The results show that the joints fabricated with pulsed current gave rise to narrower welds with practically no heat affected zone, a refined microstructure in the fusion zone, reduced microsegregation, and superior combination of mechanical properties. 关键词：C-276合金钨极氩弧焊脉冲电流力学行为焊件显微组织扫描电子显微镜显微偏析

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Improvement of Microstructure and Mechanical Behavior of Gas Tungsten Arc Weldments of Alloy C-276 by Current Pulsing

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