Fatigue strength dependence on microstructure and defects in Ti-6Al-4V welds
Paper in proceedings, 2016

The effect of defects and microstructure on mechanical properties of Ti-6Al-4V welds produced by plasma arc welding (PAW) and tungsten inert gas welding (TIG) was studied. Both types of welds were fatigue tested at 250°C. Weld microstructure, fracture surfaces, crack initiation sites and internal defects such as porosity were studied using optical microscopy and SEM. Also microhardness measurements were performed. The fatigue performance of the welds tested at 250°C was found to be comparable to each other. Fatigue cracks in almost all samples were found to initiate at pores, especially the ones close to the sample surface. Large pores and pores close to the surface were found to have the largest effect on fatigue life. The weld microstructures consisted of coarse prior β-grains.

fatigue

microstructure

porosity

welding

defects

Ti-6Al-4V

Author

Sakari Tolvanen

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Robert Pederson

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Uta Klement

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Proceedings of the 13th World Conference on Titanium

311-315

Areas of Advance

Production

Materials Science

Subject Categories

Metallurgy and Metallic Materials

ISBN

978-1-119-29366-8

More information

Created

10/7/2017