Article ID Journal Published Year Pages File Type
4768692 Fuel 2017 5 Pages PDF
Abstract
The microstructural evolution of Duplex Stainless Steel 2205 was investigated during Gas Tungsten Arc Welding with three types of protective atmosphere: (a) Ultra-high purity Ar, (b) 98% Ar-2% N2 mixture, and (c) 95% Ar-5% N2 mixture. The microstructural evolution was also characterized for three different heat inputs: low, medium, and high (0.5, 1.5, and 2.5 J mm−1. In terms of the effect of fatigue resistance and corrosion leading, the best performance was seen at values of 0.5 and 2.5 J mm−1, respectively. The decrease of the (Austenite) phase in Ar welding was associated with low performance in terms of resistance to fatigue and corrosion. On the other hand, the N2 content had a slight effect on the fatigue strength, tension, and impact resistance. A ductile fracture, which is desirable in this type of testing, was consistently observed. Protection with 2% and 5% N2 atmospheres and the control of heat input in the plasma process enabled a 45-fold lowering of the corrosion rate, increasing the life of the welded joint.
Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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