Effect of root pass filler metal on microstructure and mechanical properties in the multi-pass welding of duplex stainless steels

Kellai, Ahmed; Lounis, A.; Kahla, Sami; Idir, Brahim

doi:10.1007/s00170-017-1412-9

Cited by 14 publications

(4 citation statements)

References 30 publications

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“…In addition, the selected filler metals have a higher proportion of nickel compared to the base metal. Furthermore, nickel leads to increasing the volume fraction of the austenite phase in the welding zone therefore excellent resistance to stress, corrosion, cracking, and pitting 16 .…”

Section: Experimental Workmentioning

confidence: 99%

“…Furthermore, the selection of the welding electrode is of paramount importance in controlling the microstructure of the welding area and thus on the properties after welding [15][16][17] . An attempt has been made to investigate the effect of filler metal on solidification, microstructure, and mechanical properties of the dissimilar weld between super duplex stainless 2507 and high strength low alloy API X70 pipeline steel by Khan et al 15 .…”

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confidence: 99%

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Effect of heat treatment atmospheres on microstructure evolution and corrosion resistance of 2205 duplex stainless steel weldments

Mohamed

Hamid

et al. 2023

Sci Rep

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The effects of post heat treatment atmosphere on microstructure and corrosion resistance of duplex stainless steel welded joints were investigated. Post weld heat treatment (PWHT) was carried out with and without protective atmospheres. Nitrogen and argon are used as protective gases individually. Detailed microstructure examination (optical and SEM) demonstrates that nitrides precipitates are highly observed in the welded zones for nitrogen protected samples. An observed drop of ferrite volume fraction in post weld heat treated samples compared with welded samples without heat treatment leading to corrosion resistance enhancement of heat treated welded joints. An exception for using nitrogen as heat treatment atmosphere a decreased corrosion resistance of weldments is investigated due to nitride precipitates. An increase in the weld zone hardness for post weld heat treated samples compared with base alloy. The initial hardness of duplex stainless steel was 286 Hv while average hardness of weld zone was 340, 411, 343, and 391 Hv for as welded, PWHT using air, argon, and nitrogen atmospheres, respectively. Weld zone hardness increased to 33, 44, 20, and 37%. A significant decrease in the ultimate tensile strength and elongation after PWHT. The initial Ultimate tensile strength duplex stainless steel base material was 734.9 MPa while Ultimate tensile strength of the welded joints was 769.3, 628.4, 737.8, and 681.4 MPa for the following conditions: as welded, PWHT using air, argon, and nitrogen atmospheres, respectively.

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Section: Experimental Workmentioning

confidence: 99%

mentioning

confidence: 99%

Effect of heat treatment atmospheres on microstructure evolution and corrosion resistance of 2205 duplex stainless steel weldments

Mohamed

Hamid

et al. 2023

Sci Rep

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“…It should also be indicated that two super duplex stainless steel filler metals, i.e., ER 2594 and duplex ER 2209, were utilized for welding the UNS s31803 grade duplex stainless steel in order to determine the relationship between various mechanical properties. Afterwards, the microstructure of the welded joints was analyzed using optical microscopy (OM) and scanning electron microscopy (SEM) techniques [20]. It is worth emphasizing that many studies have shown that any phase transformation leads to a change in the volume during the heating and cooling cycles.…”

Section: Introductionmentioning

confidence: 99%

Study of the Heat Exchange and Relaxation Conditions of Residual Stresses Due to Welding of Austenitic Stainless Steel

et al. 2023

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The present study presents a numerical prediction of residual stresses (RS) using the single-pass tungsten inert gas (TIG) welding process for stainless steel plates and the two-pass TIG welding process for stainless steel pipes. The effect of heat exchange between welding material and the environment was studied. The work consists of two parts: The first one is based on the determination of the existence of residual stresses numerically using Cast3M software, which has been validated by literature results. The second part addresses the means envisaged to attenuate the amplitudes of these residual stresses by practical methods. Two parameters with significant influence on the residual stresses have been chosen: the welding bead thickness and the torch displacement speed. The finite element model used has been validated experimentally, and the results obtained for the residual stresses have been compared with those given by the numerical study. The results obtained were found to be in agreement with references results. In addition, the microstructural analysis of different areas after welding of the solder joint (base metal, heat-affected zone and solder zone) was carried out using optical microscopy analysis.

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“…On the contrary, the high heat input result in a slow cooling rate, and brittle secondary phases may be precipitated due to prolonged exposure to 600-1000 ℃. [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Correlation Between Constituent Phase and Weld Metal Properties in Ni-Reduced Duplex Stainless Steel

Lee

Moon

et al. 2021

Met. Mater. Int.

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The intrinsic properties of austenite and ferrite on the mechanical properties and corrosion resistance of the duplex stainless steel weld metals was studied by substituting Ni with Mn, N, and Mn + N. The properties of the weldments fabricated through gas tungsten arc welding (GTAW) were evaluated using tensile test, Vickers hardness, and potentiodynamic polarization tests. The mechanical properties and corrosion resistance of the constituent phases were measured using nanoindentation and electron probe microanalysis, respectively. The austenite and ferrite phase fractions of the weld metal were maintained at approximately 50:50, and no harmful phases degraded the properties. Excessive Mn decreased the corrosion resistance; a large difference in corrosion resistance between austenite and ferrite also decreased the overall corrosion resistance. In the filler metal in which Ni was replaced with only Mn or N, the austenite became harder than ferrite, as a result cracks initiated inside the austenite. The tensile test showed that austenite, which became a relatively hard phase compared to ferrite according to the chemical composition, increased the yield strength and decreased the elongation of the weld metal.

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Effect of root pass filler metal on microstructure and mechanical properties in the multi-pass welding of duplex stainless steels

Cited by 14 publications

References 30 publications

Effect of heat treatment atmospheres on microstructure evolution and corrosion resistance of 2205 duplex stainless steel weldments

Effect of heat treatment atmospheres on microstructure evolution and corrosion resistance of 2205 duplex stainless steel weldments

Study of the Heat Exchange and Relaxation Conditions of Residual Stresses Due to Welding of Austenitic Stainless Steel

Correlation Between Constituent Phase and Weld Metal Properties in Ni-Reduced Duplex Stainless Steel

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