Investigation of the localized corrosion associated with phase transformation of tube-to-tube sheet welds of hyper duplex stainless steel in acidified chloride environments

Kim, Soontae; Lee, Insung; Kim, Jin-Seung; Jang, Seok-Hwan; Park, Yong Soo; Kim, Kwang-Tae; Kim, Young-Sub

doi:10.1016/j.corsci.2012.07.014

Cited by 58 publications

(19 citation statements)

References 9 publications

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“…This has earlier been proven to be due to the depletion of Cr and/or Mo [36][37][38]. As the longer heat treatment time in this study resulted in less nitride formation, less sensitization occurred in the FBZ in the 10 min sample.…”

Section: Sensitization Behaviormentioning

confidence: 78%

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

et al. 2018

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Super duplex stainless steel (SDSS) weld metal microstructures, covering the complete temperature range from ambient to liquidus, were produced by arc heat treatment for 1 and 10 min. Temperature modeling and thermodynamic calculations complemented microstructural studies, hardness mapping and sensitization testing. After 1 min, intermetallics such as sigma and chi phase had precipitated, resulting in moderate sensitization at 720-840°C. After 10 min, larger amounts of intermetallics resulted in hardness up to 400 HV0.5 and more severe sensitization at 580-920°C. Coarse and fine secondary austenite precipitated at high and low temperatures, respectively: The finer secondary austenite was more detrimental to corrosion resistance due to its lower content of Cr, Mo, and N as predicted by thermodynamic calculations. Increased hardness and etching response suggest that 475°C embrittlement had occurred after 10 min. Results are summarized as time-temperature-precipitation and property diagrams for hardness and sensitization.

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Section: Sensitization Behaviormentioning

confidence: 78%

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

et al. 2018

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“…In addition, Figure 5(e) shows the pronounced partitioning of N. Only less than 0.1 wt% N was detected in the  phase, and most of them was partitioned into the  phase. The N solubility in the body-centered cubic structure is reported to be less than 0.1 wt%, preferentially 0.05 wt%, which is considerably lower than that in the face-centered cubic structure [7,10,12,17,[21][22][23]. Furthermore, the N has high diffusivity [23] at the elevated temperature in austenitic stainless steels (approximately 7.5x10 -8 cm 2 s -1 at…”

Section: Alloying Element Partitioningmentioning

confidence: 94%

“…The pitting corrosion resistance of a stainless steel is commonly quantified using a pitting resistance equivalent number (PREN) [16,17]. As an empirical measure of the resistance to the pitting corrosion of stainless steels, the PREN is expressed in a DSSs such as UNS S32550 alloy (26Cr-5.9Ni-3.2Mo-1.0Mn-0.2N-1.6Cu-Fe balance , [7]), UNS S32750 (25.2Cr-6.7Ni-3.4Mo-0.7Mn-0.27N-Fe balance , [10]), UNS S31803 (22.4Cr-5.7Ni-3.0Mo-1.5Mn-0.17N-Fe balance , [11]), UNS S82441 (24.0Cr-3.4Ni0-1.5Mo-3.0Mn-0.23N-Fe balance , [12]), and 26.2Cr-6.99Ni-2.37Mo-2.88W-0.35N-Fe balance DSS [13] were investigated, and the previous researchers came to the similar conclusion that the highest overall pitting corrosion resistance level of the DSS was achieved in the phase fraction-controlled sample whose two phases exhibited the lowest difference in the PREN values between the  and , , and the overall pitting corrosion resistance level was generally lowered as the value increased.…”

Section: Introductionmentioning

confidence: 99%

Understanding the relation between phase fraction and pitting corrosion resistance of UNS S32750 stainless steel

Jang

Lee

et al. 2015

Materials Characterization

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“…Pettersson et al [16] studied the CrN precipitation of UNS S32750 material with respect to cooling rate changes. Kim et al and Zhang et al reported Cr depletion zones across Cr 2 N boundaries [17,18]. Moreover, the quantity of Cr 2 N in high Mn DSS increased as the alloying content increased [19].…”

Section: Introductionmentioning

confidence: 98%

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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Investigation of the localized corrosion associated with phase transformation of tube-to-tube sheet welds of hyper duplex stainless steel in acidified chloride environments

Cited by 58 publications

References 9 publications

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

Understanding the relation between phase fraction and pitting corrosion resistance of UNS S32750 stainless steel

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

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