Microstructure, mechanical and corrosion properties of friction stir welded high nitrogen nickel-free austenitic stainless steel

Li, H.B.; Jiang, Zhouhua; Feng, Hao; Zhang, S.C.; Li, Lu; Han, Peide; Misra, R.D.K.; Li, J.Z.

doi:10.1016/j.matdes.2015.06.103

Cited by 131 publications

(29 citation statements)

References 51 publications

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“…However, elongation of the FSW joint is 30%, which is lower than that of the BM, and their difference is 6%. Li [35] explained that severe plastic deformation in the SZ reduces ductility because of high-density dislocations generated in the SZ. Plastic deformation mainly occurs on the base metal, implying that the strength of the weldments is influenced by the FSW joint.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

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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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Section: Mechanical Characterizationmentioning

confidence: 99%

“…The SEM morphology of the weldment fracture surface is characterized by a dimple with a microvoid, a feature of a ductile fracture. However, size distribution of the dimple is inhomogeneous, which corresponds to low elongation [35]. …”

Section: Mechanical Characterizationmentioning

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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“…FSW is employed for generating a suitable heat input by controlling the axial load and rotational speed, tool shoulder and pin, plunged in between the two work pieces and generates frictional heat by stirring action to overcome the problems seen in the fusion welding process. Once the material is heated to the plastic state, the tool is traversed along the welding direction, the plasticized material flows from the advancing side to the retreating side of the tool through the application of an axial force applied by the tool shoulder for softening up the material 16 . [17][18][19] have made a study of friction stir processing on the microstructure and mechanical properties of the NAB alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on Microstructure and Mechanical Properties of Friction Stir Welded Cast Nickel Aluminum Bronze Alloy (C95800)

et al. 2018

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In the present study, Friction Stir Welding (FSW) of Nickel Aluminum Bronze (NAB) alloy was carried out by varying the axial load, rotation speed and welding speed rate. Micro-structural analyses of these samples revealed the different grain sizes and shapes of the various zones. Hardness and tensile strength tests were carried out for the samples welded at different conditions such as axial load, welding speed and rotational speed. Grain refinement in the weld nugget zones was achieved for all welding conditions. The refined grains in weld nugget zone (WNZ) make a main contribution to the increase of mechanical properties of FSW welded NAB alloy. The microhardness of the stir zone and Thermo-Mechanically Affected Zone (TMAZ) was found to be higher than that of the base metal. Transverse tensile strength of weld joint was higher than that of the base metal. On the other hand, a lower or similar tensile strength value compared to the base metal was seen from other variable welding parameters. This was due to the tunnel defect in the welded nugget zone. ANOVA test result was used for finding out the contribution of the process parameter.

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“…Some other studies also found this phenomenon [28][29][30][31]. Additionally, the interface between SZ and TMAZ on the AS (Figure 2d) is relatively sharper than that on the RS (Figure 2g), which was associated with the difference of shear stress between the tool and the material on different sides [32]. The microstructure of HAZ on the AS (Figure 2c) presents a slightly distinct band structure, while it is more diffuse on the RS (Figure 2h).…”

Section: Macro-and Microstructure Observationmentioning

confidence: 59%

Microstructure, Mechanical and Corrosion Properties of Friction Stir Welding High Nitrogen Martensitic Stainless Steel 30Cr15Mo1N

Geng

Feng

et al. 2016

Metals

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High nitrogen martensitic stainless steel 30Cr15Mo1N plates were successfully welded by friction stir welding (FSW) at a tool rotation speed of 300 rpm with a welding speed of 100 mm/min, using W-Re tool. The sound joint with no significant nitrogen loss was successfully produced. Microstructure, mechanical and corrosion properties of an FSW joint were investigated. The results suggest that the grain size of the stir zone (SZ) is larger than the base metal (BM) and is much larger the case in SZ-top. Some carbides and nitrides rich in chromium were found in BM while not observed in SZ. The martensitic phase in SZ could transform to austenite phase during the FSW process and the higher peak temperature, the greater degree of transformation. The hardness of SZ is significantly lower than that of the BM. An abrupt change of hardness defined as hard zone (HZ) was found in the thermo-mechanically affected zone (TMAZ) on the advancing side (AS), and the HZ is attributed to a combination result of temperature, deformation, and material flow behavior. The corrosion resistance of SZ is superior to that of BM, which can be attributed to less precipitation and lower angle boundaries (LABs). The corrosion resistance of SZ-bottom is slight higher than that of SZ-top because of the finer grained structure.

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Microstructure, mechanical and corrosion properties of friction stir welded high nitrogen nickel-free austenitic stainless steel

Cited by 131 publications

References 51 publications

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

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

Effect of Process Parameters on Microstructure and Mechanical Properties of Friction Stir Welded Cast Nickel Aluminum Bronze Alloy (C95800)

Microstructure, Mechanical and Corrosion Properties of Friction Stir Welding High Nitrogen Martensitic Stainless Steel 30Cr15Mo1N

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