Correlation of Properties and Microstructure in Welded Titanium Alloys.

摘要

The purpose of this program was to conduct a systematic investigation to correlate the metallurgical reactions during welding to the mechanical properties and microstructures in a Ti-6Al-6V-2Sn weldment. To study the fusion-zone microstructure resulting from various welding processes (cooling rates) and its mechanical properties,four welding processes,manual gas tungsten-arc welding,plasma arc welding,automatic gas tungsten-arc welding,and electron beam welding,were used. Thermal cycles in the heat-affected zone near the fusion line were measured for the four welding processes and the cooling rates from 2500F were interpolated or extrapolated. Thus, a correlation between welding processes,cooling rates,and the continuous-cooling transformation diagram was established and the relationships between the characteristics of welding processes and CCT diagrams could be identified. (Modified author abstract)