Cyclic deformation behavior of linear friction welded Ti6Al4V joints

This study was aimed at characterizing microstructural change and fatigue properties of linear friction welded (LFWed) Ti6Al4V joints with special attention to the relationship between the microstructure and cyclic deformation behavior. The welding process resulted in a remarkable microstructure cha...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-03, Vol.597, p.408-414
Main Authors: Wen, G.D., Ma, T.J., Li, W.Y., Li, J.L., Guo, H.Z., Chen, D.L.
Format: Article
Language:English
Subjects:
Amplitudes
Applied sciences
Cold working, work hardening
annealing, quenching, tempering, recovery, and recrystallization
textures
Crack propagation
Cross-disciplinary physics: materials science
rheology
Deformation
Exact sciences and technology
Fatigue
Fatigue failure
Friction
Hardness
Joining, thermal cutting: metallurgical aspects
Linear friction welding
Low cycle fatigue
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Physics
Strain
Titanium alloys
Titanium base alloys
Treatment of materials and its effects on microstructure and properties
Welding
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study was aimed at characterizing microstructural change and fatigue properties of linear friction welded (LFWed) Ti6Al4V joints with special attention to the relationship between the microstructure and cyclic deformation behavior. The welding process resulted in a remarkable microstructure change across the LFWed joint. The microstructure of the joint consisted of fine subgrains in the weld zone (WZ) and elongated grains in the thermomechanically affected zone (TMAZ), leading to a significantly higher hardness in the WZ. Both the base metal (BM) and joint exhibited essentially symmetrical hysteresis loops and equivalent fatigue life, while the cyclic strain hardening exponent of the welded joint was lower. Cyclic stabilization appeared at lower strain amplitudes up to 0.6% in both the BM and joint, however, cyclic softening occurred at higher strain amplitudes. Fatigue failure was observed to occur in the BM, and fatigue crack initiated from the specimen surface or near-surface defect. Fatigue crack propagation was basically characterized by fatigue striations, together with some secondary cracks.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.01.006