Journal
MATERIALS AT HIGH TEMPERATURES
Volume 33, Issue 3, Pages 257-269Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09603409.2016.1182960
Keywords
Alloy 718; GTA weld; Liquid nitrogen; Laves phase; Tensile strength; Direct ageing
Funding
- Indian Space Research Organisation, Department of Space
Ask authors/readers for more resources
The micro-segregation of niobium and Laves phase formation during Gas Tungsten Arc (GTA) welding of alloy 718 were studied by employing different cooling techniques which resulted in weld cooling rates ranging from 43.2 degrees C/s to 508.7 degrees C/s. The weld cooling rates were achieved by the combinations of modified pulse wave form, argon and helium shielding gases, copper heat sink and liquid nitrogen cooling. A combination of compound current pulse (CCP) waveform with helium shielding and liquid nitrogen cooling resulted in lesser niobium segregation and discontinuous, finer Laves particles in the interdendritic regions compared to that of the conventional constant current GTA weld metal. This process yielded better ageing response and improved high temperature mechanical properties of the weldments.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available