Nonhomogeneous microstructure formation and its role on tensile and fatigue performance of duplex stainless steel 2205 multi-pass weld joints

Xie, Xuefang; Li, Jingwen; Jiang, Wenchun; Dong, Zhongqi; Tu, Shan‐Tung; Zhai, Xiangnan; Zhao, Xu

doi:10.1016/j.msea.2020.139426

Cited by 32 publications

(10 citation statements)

References 33 publications

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“…This means that from the liquid state, the grains of α-phase nucleate and grow preferentially, and different morphologies of γ grains are subsequently formed [ 41 ]. Furthermore, the thermal cycle across the DSS welds is highly heterogeneous and complex, especially for the multi-pass welding as in the GTAW process [ 42 ]. Figure 10 shows the optical microstructure of the cross-section of the GTAWed joint—the BM ( Figure 10 a) and the different welding zones: HAZ ( Figure 10 b,c), and WZ ( Figure 10 d–f).…”

Section: Resultsmentioning

confidence: 99%

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Friction Stir Welding of 2205 Duplex Stainless Steel: Feasibility of Butt Joint Groove Filling in Comparison to Gas Tungsten Arc Welding

et al. 2021

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This work investigates the feasibility of using friction stir welding (FSW) process as a groove filling welding technique to weld duplex stainless steel (DSS) that is extensively used by petroleum service companies and marine industries. For the FSW experiments, three different groove geometries without root gap were designed and machined in a DSS plates 6.5 mm thick. FSW were carried out to produce butt-joints at a constant tool rotation rate of 300 rpm, traverse welding speed of 25 mm/min, and tilt angle of 3o using tungsten carbide (WC) tool. For comparison, the same DSS plates were welded using gas tungsten arc welding (GTAW). The produced joints were evaluated and characterized using radiographic inspection, optical microscopy, and hardness and tensile testing. Electron back scattering diffraction (EBSD) was used to examine the grain structure and phases before and after FSW. The initial results indicate that FSW were used successfully to weld DSS joints with different groove designs with defect-free joints produced using the 60° V-shape groove with a 2 mm root face without root gap. This friction stir welded (FSWed) joint was further investigated and compared with the GTAW joint. The FSWed joint microstructure mainly consists of α and γ with significant grain refining; the GTWA weld contains different austenitic-phase (γ) morphologies such as grain boundary austenite (GBA), intragranular austenite precipitates (IGA), and Widmanstätten austenite (WA) besides the ferrite phase (α) in the weld zone (WZ) due to the used high heat input and 2209 filler rod. The yield strength, ultimate tensile strength, and elongation of the FSWed joint are enhanced over the GTAW weldment by 21%, 41%, and 66% and over the BM by 65%, 33%, and 54%, respectively. EBSD investigation showed a significant grain refining after FSW with grain size average of 1.88 µm for austenite and 2.2 µm for ferrite.

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Section: Resultsmentioning

confidence: 99%

“…Furthermore, only around 16% improvement in the Ys is detected for the GTAWed joints over the Ys of the BM with no remarkable increase in the UTS. This enhancement in yield stress may also be ascribed to the grain refining in the WZ [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

Friction Stir Welding of 2205 Duplex Stainless Steel: Feasibility of Butt Joint Groove Filling in Comparison to Gas Tungsten Arc Welding

et al. 2021

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“…The basic mechanical properties of SAF2205 duplex stainless steel are shown in Table 2. 7,30 The schematic diagram of the SAF2205 cruciform welding component is shown in Figure 1A. Figure 1B shows the macroscopic structure of the cruciform welded joint, and Figure 1C shows the schematic diagram of the welding sequence and area division of the cruciform welded joint.…”

Section: Materials and Experimental Preparationmentioning

confidence: 99%

Effects of cavitation jet peening treatment on the residual stress and fatigue properties of SAF2205 cruciform welded joints

Zheng

Luo

Jiang

et al. 2022

Fatigue Fract Eng Mat Struct

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The cruciform welded joint is a weak position of filter press to cause fatigue failure under cyclic conditions. In this study, cavitation jet peening (CJP) treatment is proposed to improve the fatigue life of SAF2205 cruciform welded joints. The effects of different CJP treatment positions on the residual stress, microstructure, and microhardness were studied. The results show that different CJP treatment positions have different on residual stresses and fatigue life. The order of the residual stress in fracture position from large to small is the fully treated specimen, untreated specimen, one-sided treated specimen, and diagonal treated specimen, which is exactly opposite to the order of fatigue life from large to small. After the diagonal CJP treatment, the fatigue life is increased by up to 242.19%, and the residual stress at the weld toe is reduced by more than 80%. A strengthening layer with thicknesses of about 400 μm is formed.

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“…With the inclusion of vibrations, the grain refinement is gradually improved. Therefore with the fine grain refinement, the tensile strength of the mild steel weldments is improved (Xie et al, 2020).…”

Section: Welded Joints Microstructural Analysis At 190 V Of Vibro-motor and Different Voltages Of Dc Motormentioning

confidence: 99%

The effect of vibratory conditioning on tensile strength and microstructure of 1018 mild steel

Bade

Rao

Rao³

2020

WJE

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Purpose The purpose of this paper is to investigate the prominence of mechanical excitations at the time of welding. In the past years, the process of welding technology has expanded its influence in manufacturing. The crucial drawback of conventional welding is prompted by internal stresses and distortions, which is the focal reason for weld defects. These weld defects can be diminished by the process called post-weld heat treatment (PWHT), which consumes more working hours and needs skilled workers. To replace these PWHT processes, mechanical vibrations are introduced during the process of welding to diminish these weld defects. Design/methodology/approach In the current research, the mechanical vibrations are transferred to weld-pool through vibro-motor and DC motor connected to the electrode. As per standards, the tensile test specimens were prepared for welding with different voltages of vibro-motor and DC motor respectively. The weld joints were tested for tensile strength and analyzed the microstructure at the fusion zone. Findings Melt-ability at fusion zone of 1018 mild steel was investigated by the single-stroke intense heat process of fusion welding. It is observed that the mechanical vibrations technique has a profound influence on the enhancement of the fusion zone characteristics and grain structure. The peak value of the tensile strength is observed at 100 s of vibration, 190 V of vibro-motor voltage and 18 V of electrode voltage. The tensile strength of the welded joints with vibrations is increased up to 22.64% when it is compared with conventional welding. The enhancement of the tensile strength of the weld bead was obtained because of the formation of fine grain structure. So, mechanical vibrations are identified as the most convenient method for improving the mild steel alloys weld quality. Originality/value A novel approach called mechanical vibrations during the process of welding is implemented for fusion zone refinement.

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Nonhomogeneous microstructure formation and its role on tensile and fatigue performance of duplex stainless steel 2205 multi-pass weld joints

Cited by 32 publications

References 33 publications

Friction Stir Welding of 2205 Duplex Stainless Steel: Feasibility of Butt Joint Groove Filling in Comparison to Gas Tungsten Arc Welding

Friction Stir Welding of 2205 Duplex Stainless Steel: Feasibility of Butt Joint Groove Filling in Comparison to Gas Tungsten Arc Welding

Effects of cavitation jet peening treatment on the residual stress and fatigue properties of SAF2205 cruciform welded joints

The effect of vibratory conditioning on tensile strength and microstructure of 1018 mild steel

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