Detailed Microstructural Characterization and Restoration Mechanisms of Duplex and Superduplex Stainless Steel Friction-Stir-Welded Joints

Santos, Tiago Felipe de Abreu; Ea, Torres; Lippold, John C.; Ramírez, Antonio J.

doi:10.1007/s11665-016-2357-0

Cited by 31 publications

(17 citation statements)

References 49 publications

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“…This behavior is caused by ferrite's diverse recovery mechanisms during FSP: initially, this phase presents a dynamic recovery, which then evolves to recrystallization. It is worth mentioning that FSP did not promote strain hardening of the workpiece, as microstructural modifications promoted by this process are due to recrystallization phenomena 13 . A more detailed discussion about the microstructural development of DSS's on FSP was published previously by Santos et al 13 .…”

Section: Methodsmentioning

confidence: 97%

“…It is worth mentioning that FSP did not promote strain hardening of the workpiece, as microstructural modifications promoted by this process are due to recrystallization phenomena 13 . A more detailed discussion about the microstructural development of DSS's on FSP was published previously by Santos et al 13 . Figure 5 shows the schematic of the regions where the microhardness measures were conducted.…”

Section: Methodsmentioning

confidence: 97%

“…FSP occurs mainly through the contact of a rotating tool, composed of a shoulder and pin, that is plunged with an axial force in the workpiece, generating heat by friction and deformation. In this process the microstructure of the material undergoes severe hot plastic deformation, resulting in a ultra-fine grains microstructure caused by recrystallization and recovery processes 13 . Advantages of employing FSP can span from microstructure homogenization, production of superplastic materials and special alloys, porosity reduction in casting alloys, to crack repairing 14 .…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Abrasive Wear in UNS S32101 and S32750 Duplex Stainless Steels Submitted to Friction Stir Processing

et al. 2019

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Duplex stainless steels are largely applied in petrochemical industries due to their high corrosion resistance and mechanical performance. Their applicability also requires a great wear resistance, which can be enhanced by friction stir processing (FSP), a surface hardening technique. In this work, FSP is utilized to process surfaces of UNS S32101 and UNS S32750. The materials were analyzed by EBSD in order to determine grain size and phase fraction. Microhardness tests were used to verify and compare the shifting of hardness values from 296 ± 8 to 314 ± 11 HV 0.2/15 and from 323 ± 8 to 350 ± 8 HV 0.2/15 for UNS S32101 and S32750, respectively. Abrasion tests were executed to study the wear behavior of both processed and unprocessed alloys. Abrasion tests indicated that the hardening by FSP promoted decrement of abrasive wear resistance. Volumetric loss increased after FSP, from 52.1 ± 0.5 to 53 ± 2 mm 3 , for UNS S32101, and from 50 ± 2 to 56.3 ± 0.3 mm 3 for UNS S32750. Tensile tests results were fitted to Hollomon's equation in order to identify mechanical properties and tendencies of strain hardening. SEM images were used to classify the wear micromechanisms acting on the samples. The results suggest that FSP can promote modifications of wear mechanisms and these changes can be correlated to the alloys' microstructure.

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Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Abrasive Wear in UNS S32101 and S32750 Duplex Stainless Steels Submitted to Friction Stir Processing

et al. 2019

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“…In addition, both the α and c grains were significantly refined, especially the c grains (Figure 10). In fact, the TMAZ experienced lower degree of plastic deformation and lower temperature than SZ which is insufficient for full DRX [4,20], whereas partial recrystallization must occur near the border of TMAZ/SZ, especially in c grains [32]. e mechanisms of grain refining are different for α and c due to their different crystal structure 6…”

Section: Macrographs and Microstructure Of The Weldsmentioning

confidence: 99%

“…Advances in Materials Science and Engineering [32,33]. α, with body-centered cubic (BCC) crystal structure, has high SFE and many slip systems.…”

Section: Macrographs and Microstructure Of The Weldsmentioning

confidence: 99%

Effect of Rotation Speed on Microstructure and Mechanical Properties of Friction‐Stir‐Welded 2205 Duplex Stainless Steel

Wang

et al. 2020

Advances in Materials Science and Engineering

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In the present study, 1.86-mm-thick steel plates (UNS S32205) were friction-stir-welded at various rotation speeds of 300 to 600 rpm and a constant welding speed of 100 mm·min−1. The effect of rotation speed on the microstructure and mechanical properties of the welds was researched. The welding temperature was recorded during friction stir welding (FSW), and the microstructure and mechanical properties of the welds were assessed. The incomplete penetration defect was formed at 300 rpm due to the insufficient heat input, and macroscopic groove-like defect was formed at 600 rpm because of the serious sticking of tool. Defect-free welds were obtained at 350 to 500 rpm. The lower rotation speed corresponds to lower heat input during FSW, which resulted in finer recrystallized grains within the stirred zone and thermomechanically affected zone. The joint width was increased with the increasing rotation speed. Therefore, both the strength and hardness of the weld joints increased with the decreasing of rotation speed.

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Role of microstructure on the varying corrosion behavior across the UNS S32750 super duplex stainless steel friction stir weld

Ajay,

Prasad,

Rao

et al. 2024

J Mater Sci

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Detailed Microstructural Characterization and Restoration Mechanisms of Duplex and Superduplex Stainless Steel Friction-Stir-Welded Joints

Cited by 31 publications

References 49 publications

Evaluation of Abrasive Wear in UNS S32101 and S32750 Duplex Stainless Steels Submitted to Friction Stir Processing

Evaluation of Abrasive Wear in UNS S32101 and S32750 Duplex Stainless Steels Submitted to Friction Stir Processing

Effect of Rotation Speed on Microstructure and Mechanical Properties of Friction‐Stir‐Welded 2205 Duplex Stainless Steel

Role of microstructure on the varying corrosion behavior across the UNS S32750 super duplex stainless steel friction stir weld

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