Welding Studies on a Near-alpha Titanium Alloy

Suresh Meshram; T. Mohandas

doi:10.14429/dsj.61.648

Suresh Meshram Defence Metallurgical Research Laboratory, Hyderabad
T. Mohandas Defence Metallurgical Research Laboratory, Hyderabad

DOI: https://doi.org/10.14429/dsj.61.648

Keywords: Electron Beam weld, Friction weld, Mechanical and metallurgical properties

Abstract

The mechanical properties and microstructures of electron beam and friction welds of a near-alpha titanium alloy IMI 834 (presently TIMET 834) have been evaluated. Electron beam welds that contain micro pores and friction welds are free from such solidification-related defects. Porosity index in electron beam welds shows a decreasing trend with an increase in the welding speed. Electron beam welds contain coarse prior β grains and fine transformed β microstructure while, friction welds contain fine prior β grains and coarse transformed β microstructure. Electron beam welds with fine transformed β microstructure exhibited higher strength as compared to friction welds with coarse transformed β microstructure. The impact toughness of both the welds is comparable. Drastic reduction in impact toughness was observed when the welds were subjected to post-weld ageing as a result of inter-lath precipitation. Coarse-grained electron beam welds exhibited better creep and stress rupture properties as compared to friction welds.

Defence Science Journal, 2011, 61(6), pp.590-596, DOI:http://dx.doi.org/10.14429/dsj.61.648

Author Biographies

Suresh Meshram, Defence Metallurgical Research Laboratory, Hyderabad

Mr Suresh D. Meshram received BE (Mechanical) from NIT, Surat, in 2000 and MTech (Prod. & Ind. System Engg.) from IIT Roorkee in 2002. He is working as scientist at Defence Metallurgical Research Laboratory (DMRL), Hyderabad since 2003 in Metal Joining Group. Area of Research mainly includes joining of advance similar and dissimilar materials through process like electron beam welding, friction welding and friction stir welding and characterisation of welded joints.

T. Mohandas, Defence Metallurgical Research Laboratory, Hyderabad

Dr Thondapi Mohandas superannuated from DMRL as Scientist ‘G’. The technical contributions include: Failure analysis of components in Indian naval ships, weldability studies on materials such as titanium alloys, steels, aluminium alloys, metal-matrix composites, ballistic evaluation of armour steels and techniques to improve ballistic properties He guided four PhD scholars, and about 30 MTech/BTech Projects. Comprehensive studies in the enumerated areas led to about 170 publications in International and national Journals and conferences, 40 Technical reports, 1 Monogram and 50 investigation reports on failure of components.