Influence of Filler on the Microstructure, Mechanical Properties and Residual Stresses in TIG Weldments of Dissimilar Titanium Alloys  

作　　者：Massab Junaid Fahd Nawaz Khan Tauheed Shahbaz Haris saleem Julfikar Haider 

机构地区：[1]Faculty of Mechanical Engineering,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology,Topi 23640,Pakistan [2]Faculty of Materials and Chemical Engineering,Department of Materials Science,Ghulam Ishaq Khan Institute of Engineering Sciences and Technology,Topi 23640,Pakistan [3]Advanced Materials and Surface Engineering(AMSE)Research Centre,Manchester Metropolitan University,Chester Street,Manchester M15GD,UK

出　　处：《Acta Metallurgica Sinica(English Letters)》2021年第10期1395-1406,共12页金属学报（英文版）

摘　　要：The influence of titanium alloy(Ti–5 Al–2.5 Sn) and commercially pure titanium(cp Ti) as fillers on dissimilar pulsed tungsten inert gas weldments of Ti–5 Al–2.5 Sn/cp Ti was investigated in terms of microstructure, mechanical/nano-mechanical properties, and residual stresses. A partial martensitic transformation was observed in the weldments for all the welding conditions due to high heat input. The microstructure evolved in the FZ/cp Ti interfacial region was observed to be the most sensitive to the proportion of α stabilizer in the filler alloy. Furthermore, the addition of filler alloy improved the tensile properties and nano-mechanical response of the weld joint owing to the increased volume of metal in the weld joint. As compared to the Ti–5 Al–2.5 Sn wire, the use of cp Ti filler wire proved to be better in terms of energy absorbed during tensile and impact tests, tensile strength and ductility of the dissimilar welds. An asymmetrical residual stresses profile was observed close to the weld centerline, with high compressive stresses on the Ti–5 Al–2.5 Sn side for both the weldments obtained with and without filler wires. This was attributed to mainly the low thermal conductivity of Ti–5 Al–2.5 Sn. The presence of residual stresses also influenced the nano-hardness profile across the weldments.

关 键 词：Titanium alloys Dissimilar welding Nano-indentation Residual stresses Tungsten inert gas(TIG)welding MICROSTRUCTURE 

分 类 号：TG457.1[金属学及工艺—焊接]