Effect of aging of 2507 super duplex stainless steel on sliding tribocorrosion in chloride solution

Shockley, J. Michael; Horton, Derek J.; Wahl, Kathryn J.

doi:10.1016/j.wear.2017.03.019

Cited by 22 publications

(19 citation statements)

References 29 publications

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“…The σ grains were rich in Cr and Mo, resulting in the depletion of passivating alloy in the adjacent phases. Meanwhile, this process led to a local relative increase in the Ni concentration in the adjacent phases, assisting the secondary austenite (γ') formation in a lamellar structure in the vicinity of the sigma phase [47]. This phase transformation resulted from diffusion of the alloying elements, such as Mo and Cr, and led to new phase formation through thermal cycling.…”

Section: Discussionmentioning

confidence: 99%

Large Delta T Thermal Cycling Induced Stress Accelerates Equilibrium and Transformation in Super DSS

Chen

Yen

et al. 2020

Crystals

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Based on the predicted phase diagram of super duplex stainless steel (DSS) calculated by Thermo-Calc, the maximum peak temperature 1100 °C was selected to ensure no σ phase existence. This target temperature fell into the two-phase solid solution (SS) region. A series of different thermal cycling tests were carried out with the notations of 2SS, 2SS + 3 cycles, 2SS + 7 cycles, 2SS + 13 cycles, and 2SS + 20 cycles. It was found that the trend of two-phase volume ratio variation by thermal cycling followed the predicted thermodynamic equilibrium trend. After 2SS + 7 cycles, the ratio of two-phase δ/γ tended toward the ideal 1:1. According to the electron backscatter diffraction (EBSD) analysis, the δ phase crystal orientation changed from the most frequent directions of <001> and <111> of the as-received sample to the most frequent orientation of <113> after two SS treatments. While the γ phase grain always remained at <101> orientation. The grain boundary misorientation angles of the γ grains were relatively stable, ranging from 53° to 63°, but those of the δ grains were widely distributed actively presuming the lattice rotation. The Kernel Average Misorientation (KAM) value of the local strain in face center cubic (fcc) γ grains was varied and greater than that of the body center cubic (bcc) δ phase, indicating that the former, with a large grain boundary misorientation had larger local deformation than the latter, which possesses wide random misorientation angle distribution.

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Section: Discussionmentioning

confidence: 99%

Large Delta T Thermal Cycling Induced Stress Accelerates Equilibrium and Transformation in Super DSS

Chen

Yen

et al. 2020

Crystals

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“…Additionally, the aging effect of super duplex stainless steel on sliding tribocorrosion in a chloride solution was studied and reported that isothermal heat treatment induced the growth of secondary phases, including the sigma phase, secondary austenite, and chi phase. It was revealed that pitting corrosion was preferentially associated with secondary austenite, and material loss calculated from the current transients during pitting was much greater than that measured through surface profiling of wear tracks [28].…”

Section: Introductionmentioning

confidence: 89%

Effect of Dynamic Reheating Controlled by the Weaving Width on the Microstructure of GTA Bead-On-Pipe Weld Metal of 25% Cr Super Duplex Stainless Steel

Sung

Kang

2018

Metals

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Gas tungsten arc welding (GTAW) with three different heat inputs controlled by the weaving width was performed to understand their effects on the microstructural changes during bead-on-pipe welding of super duplex stainless steel. The microstructure of the weld metals was categorized into three different types of zones: non-reheated, reheated type, and reheating-free zone. Even though single-pass welding with different weaving widths was employed, a reheated microstructure was detected, which has been previously observed with multiple pass welding. This phenomenon was called "dynamic reheating", because it was produced by the weaving operation during welding regardless of the weaving width. The categorized area fraction varied with the weaving width change. Electron backscatter diffraction (EBSD) results at the edge (the area near the fusion line) of the low-heat-input condition indicated a higher austenite volume fraction and a lower Cr 2 N fraction than that of the medium heat input condition. Thus, it described an inverse relationship, because higher heat input provided a lower austenite fraction. In addition, it was observed clearly that the austenite fraction at the medium heat input condition was dramatically increased by reheating, while the Cr 2 N fraction was reduced. Regardless of the weaving width, reheating contributed to the increase of the austenite fraction, further reducing the Cr 2 N quantity. The edge areas in the map showed an inverse relationship in the reheated area fraction between low heat input and medium heat input. For this reason, the austenite fraction on the weld metal was determined not only by the heat input, but also by the amount of reheating.

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“…Wang et al 70 revealed that preferential dissolution at the boundary region between carbides and the CoCrMo matrix accelerates abrasive wear in medical implant alloys. Shockley et al 16 demonstrated, for an aged duplex stainless steel, that sliding wear initiated runaway pitting corrosion in susceptible phases, which did not occur in the absence of sliding.…”

Section: Tribocorrosionmentioning

confidence: 99%

“…5 The ensuing decade has brought significant advances both at the larger scales (e.g., Refs. [6][7][8][9][10][11][12][13][14][15][16][17] and at the nanoscale (e.g., Refs. [18][19][20][21][22]; the latter is the focus of the present article.…”

Section: Introductionmentioning

confidence: 99%

Insights into tribology from in situ nanoscale experiments

et al. 2019

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Effect of aging of 2507 super duplex stainless steel on sliding tribocorrosion in chloride solution

Cited by 22 publications

References 29 publications

Large Delta T Thermal Cycling Induced Stress Accelerates Equilibrium and Transformation in Super DSS

Large Delta T Thermal Cycling Induced Stress Accelerates Equilibrium and Transformation in Super DSS

Effect of Dynamic Reheating Controlled by the Weaving Width on the Microstructure of GTA Bead-On-Pipe Weld Metal of 25% Cr Super Duplex Stainless Steel

Insights into tribology from in situ nanoscale experiments

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