Microstructure and mechanical properties of friction stir welded lean duplex stainless steel

Esmailzadeh, Mojtaba; Shamanian, M.; Kermanpur, A.; Saeid, T.

doi:10.1016/j.msea.2012.10.068

Cited by 75 publications

(51 citation statements)

References 19 publications

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“…It is believed that the recrystallization phenomenon is the main mechanism refining both austenite and ferrite grain sizes [14]. The details related to the microstructure of the welds have been presented elsewhere [18].…”

Section: Methodsmentioning

confidence: 99%

“…Based on the obtained results, the hardness and strength of the stir zone were enhanced remarkably after friction stir welding. Esmailzadeh et al [18] investigated the effect of heat input on the microstructure and mechanical properties of friction stir welded joints of a lean duplex stainless steel, finding that the mechanical properties were improved by decreasing the heat input (increasing the welding speed during FSW).…”

Section: Introductionmentioning

confidence: 99%

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Pitting corrosion susceptibility of friction stir welded lean duplex stainless steel joints

Atapour

Sarlak

Esmailzadeh

2015

Int J Adv Manuf Technol

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The effect of friction stir welding (FSW) on the pitting corrosion resistance of a lean duplex stainless steel was investigated in chloride-containing and chloride-free electrolytes. FSW was carried out by employing a constant rotation speed of 800 rpm at the welding speeds of 50, 100, and 150 mm/min using WC-based tool. Cyclic polarization results showed the same corrosion resistance of the base metal and welded joints in 0.1 M H 2 SO 4 . The optical microscopy observations after cyclic polarization tests revealed that no signs of pitting corrosion were evident for the base metal and different FS welds in chloride-free 0.1 M H2SO4 solution. In contrast, a wide positive hysteresis loop indicative of pitting corrosion susceptibility was displayed for the base metal and FS welds in 0.1 M H 2 SO 4 +0.1 M NaCl solution. The optical micrographs of pitting corrosion in the base metal and various FS welds demonstrated that the size of pits was decreased and the number of pits was increased after FSW. It was also found that increasing the welding speed led to an increase in the number of pits and a decrease in the size of pits. In other words, the resistance to pit growth was improved by decreasing the heat input during FSW. These results were interpreted with respect to the noticeable grain refinement that occurred during FSW.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pitting corrosion susceptibility of friction stir welded lean duplex stainless steel joints

Atapour

Sarlak

Esmailzadeh

2015

Int J Adv Manuf Technol

Self Cite

View full text Add to dashboard Cite

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“…As such, it further assumed that the heat input will manipulate these properties in a welded part because the austenite-to-ferrite stability is related to the cooling rate [133]. The toughness was reportedly improved as the heat input was top-up on SAF 2205 [97].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Mohammed

Ishak

Aqida

et al. 2017

Metals

105

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Abstract:The effects of input heat of different welding processes on the microstructure, corrosion, and mechanical characteristics of welded duplex stainless steel (DSS) are reviewed. Austenitic stainless steel (ASS) is welded using low-heat inputs. However, owing to differences in the physical metallurgy between ASS and DSS, low-heat inputs should be avoided for DSS. This review highlights the differences in solidification mode and transformation characteristics between ASS and DSS with regard to the heat input in welding processes. Specifically, many studies about the effects of heat energy input in welding process on the pitting corrosion, intergranular stress, stress-corrosion cracking, and mechanical properties of weldments of DSS are reviewed.

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“…Based on a simple mode of heat generation during FSW described by Schmidt [31], maximum heat is generated in interfaces of shoulder and plate. SAF2707HD is a high-alloyed steel, and the precipitation rate of the σ phase is generally fast.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

Characterization of the Microstructure, Mechanical Properties, and Corrosion Resistance of a Friction-Stir-Welded Joint of Hyper Duplex Stainless Steel

Xing-long

et al. 2017

Metals

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This study investigates the microstructure, mechanical properties, and corrosion resistance of a friction-stir-welded joint of the hyper duplex stainless steel SAF2707. Friction stir welding (FSW) is performed at a tool rotation rate of 400 rpm and a welding speed of 100 mm/min. The microstructure of the joints is examined using scanning electron microscopy and X-ray diffraction. Tensile test and fractography are subsequently employed to evaluate the mechanical properties of the joints. Results show that the grain size of the stir zone (SZ) is smaller than that of the base metal (BM). Electron back-scattered diffraction analysis reveals that fine-equiaxed grains form in the SZ because of the dynamic recrystallization during the FSW. These grains become increasingly pronounced in the austenite phase. The tensile specimens consistently fail in the BM, implying that the welded joint is an overmatch to the BM. Moreover, the welded joints consist of finer grains and thus display higher tensile strength than their BMs. Potentiodynamic polarization curves and impedance spectroscopy both demonstrate that the corrosion resistance of the SZ is superior to that of the base material.

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Microstructure and mechanical properties of friction stir welded lean duplex stainless steel

Cited by 75 publications

References 19 publications

Pitting corrosion susceptibility of friction stir welded lean duplex stainless steel joints

Pitting corrosion susceptibility of friction stir welded lean duplex stainless steel joints

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Characterization of the Microstructure, Mechanical Properties, and Corrosion Resistance of a Friction-Stir-Welded Joint of Hyper Duplex Stainless Steel

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