Abstract
The relation among microstructure and fatigue behavior of 2205/316L stainless steel dissimilar welded joints was investigated. Plates of 6.35 mm in thickness with a single-V joint configuration were gas metal arc welded (GMAW) in a single pass by feeding at 6 m/min an ER2209 filler wire with a heat input of 1.2 kJ/mm. Grain growth in the high temperature-heat affected zone (HT-HAZ) occurred mostly at the mid-height of the plates, delimiting the width of this region up to ~1.28 and ~0.73 mm of the 2205 and 316L plates, respectively. Dilution of the 316L plate with the ER2209 filler altered the solidification mode in this side of the weld and led to a significant content of austenite along the fusion line. Fatigue tests were performed using sinusoidal waveform at room temperature applying uniaxial cyclic loading, between constant stress limits within the elastic deformation of tension and compression (Δσ) with stress ratio R = −0.3. With stress ranges of 98% and 95% the fatigue specimens rapidly failed in much less than 106 cycles. The failure crack initiated at the surface of the 316L in the HT-HAZ near the weld toe. Surface analyses of unbroken specimens before and after fatigue testing revealed a significant increment in roughness of the 316L base material owing to the formation of intrusions and extrusions.
Highlights
Engineers face the need to join different alloys to optimize the design and exploiting the individual characteristics of the new materials
The objective of this study is to evaluate the fatigue life of the 2205/316L stainless steel dissimilar welded joints
This study investigated the fatigue life of the 2205/316L stainless steel dissimilar welded joint and based on the experimental results, the following conclusions are drawn: The dissimilar welded joint experienced different dilution behavior at each base metal (BM) due to differences in the thermophysical properties between Duplex stainless steels (DSSs) and austenitic stainless steel (ASS)
Summary
Engineers face the need to join different alloys to optimize the design and exploiting the individual characteristics of the new materials. Welding of dissimilar materials has increased considerably in the industry due to the great benefits that include improvements in design flexibility and cost reduction. The most popular and versatile method for joining components and assembling rigs at an industrial level is arc fusion welding. The heat input of the process gives rise to localized heterogeneities in the microstructure and mechanical properties of the base metal (BM), weld metal (WM) and heat affected zone (HAZ), leading to a complex mechanical behavior of the welded component when subjected to different loads. The mechanical strength of the welded joints represents a very important factor in the estimation of the useful life of containers and pressurized pipes, which determines the resistance of the entire structure. In most of the cases, the failure of welded joints induced by fatigue starts at the toe of the weld bead, and the failure is caused by the propagation of semi-elliptical cracks on the surface and propagates across the base material [8,9]
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