Effect of Post Weld Heat Treatment on Microstructure and Mechanical Properties of Welded 2205 Duplex Stainless Steel

Badji, Riad; Belkessa, Brahim; Maza, H.; Bouabdallah, M.; Bacroix, Brigitte; Kahloun, C.

doi:10.4028/www.scientific.net/msf.467-470.217

Cited by 19 publications

(9 citation statements)

References 5 publications

(5 reference statements)

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“…It should be noted that the lattice parameters calculated here for ferrite, austenite and  phase are consistent with those existing in the literature [33]. Additionally, the temperatures at which  phase formation is observed during hot forging are the same as the ones identified for  phase formation during annealing after welding [34]. Fig.…”

Section: The Expected Recrystallization Mechanisms and Resulting Textsupporting

confidence: 90%

Microstructure, Mechanical Behavior and Crystallographic Texture in a Hot Forged Dual Phase Stainless Steel.

Badji

Cheniti

Kahloun

et al. 2021

Preprint

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In this work, the hot forging behavior of a dual phase stainless steel in the temperature range of 850 – 1250 °C was investigated. The study revealed the occurrence of a significant cracking phenomenon for processing temperatures below 950 °C that was attributed to the combined effect of intermetallic precipitation and severe deformation. EBSD examination highlighted the occurrence of continuous dynamic recrystallization in both ferrite and austenite microstructures for processing temperatures above 1050 °C. Increasing the hot forging temperature to 1250 °C increased the low angle grain boundaries fraction and lowered the one of the high angle grain boundaries. This was accompanied by a gradual change in the crystallographic texture of the material. The mechanical behavior investigation showed that the steel plasticity, sharply dropped after forging at 850°, was gradually recovered after hot forging at temperatures above 1050°C. This was confirmed by nanoindentation measurements that revealed a remarkable increase of the hardness and young modulus of the steel after hot forging at 850°C and 950°C due to the dislocation nucleation and the s phase precipitation at g/δ interface. The enhancement of dislocation movement at the vicinity of the grain boundaries due to the absence of s phase as well as the dynamic recovery and recrystallization occurring in the temperature range of 1050°C - 1250 °C improved the global mechanical properties of the hot forged steel.

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Section: The Expected Recrystallization Mechanisms and Resulting Textsupporting

confidence: 90%

Microstructure, Mechanical Behavior and Crystallographic Texture in a Hot Forged Dual Phase Stainless Steel.

Badji

Cheniti

Kahloun

et al. 2021

Preprint

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“…DSS typically have δ ferrite, primary austenite γ 1 , secondary austenite γ 2 , σ, χ, carbides and nitrites. For the solidified zone of DSS, the austenite phases are generally formed from ferrite in different modes: allotriomorphic austenite in the borders of ferrite grains (GBA), intragranular austenite (IGA) and austenite Widmanstätten (WA) within the grains 36 . For Figure 6b and Figure 6c, the effects of GTAW welding with 99.9% Ar as shielding gas and a mixture of Ar + 2% N 2 in three orthogonal directions are presented.…”

Section: Resultsmentioning

confidence: 99%

Effect of Nitrogen Addition to Shielding Gas on Cooling Rates and in the Microstructure of Thin Sheets of Duplex Stainless Steel Welded by Pulsed Gas Tungsten Arc Welding Process

et al. 2019

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The effect of the nitrogen content in the shielding gas and its effect on temperature distributions at the welded zone of thin sheets of duplex stainless steel have been evaluated. The duplex stainless steels have many features due to unique microstructural combination of austenite and ferrite grains. The phase balance can be easily shifted depending on the welding parameters. Two sheets were welded using pure argon and pure argon plus 2% of nitrogen as shielding gas. The thermal profile had shown that N 2-supplemented shielding gas lead to higher peaks of temperature using similar welding parameters. Microstructural examination showed that the austenite phase in the weld increased with the presence of nitrogen in the shielding gas. The added nitrogen promoted primary austenite formation and slightly increases the microhardness at the solidified zone. Microhardness mapping and metallographic imaging presented information about microstructures, confirming the formation of secondary phases during thermal cycle in the temperature range 850 °C and 950 °C. Control of ferrite amounts in the welds is essential mainly to improve mechanical properties and corrosion resistance of welding zones.

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“…In practical, many papers have paid more attention to reduce the FN when both filler and base metal were welded in DSS. The FN was increased, when increasing the heat treatment temperature (Lai et al, 1995) and high aging temperature above 1000°C is also encouraged to increase the FN (Badji et al, 2004(Badji et al, , 2008 with changes in mechanical properties. Consequently, these treatments favor to minimize the undesirable precipitations at high temperature range.…”

Section: Experimental Parameters and Designmentioning

confidence: 99%

Optimization of Ferrite Number of Solution Annealed Duplex Stainless Steel Cladding Using Integrated Artificial Neural Network: Simulated Annealing

Rathinam¹,

Kannan²

2014

RJASET

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Cladding is the most economical process used on the surface of low carbon structural steel to improve the corrosion resistance. The corrosion resistant property is based on the amount of ferrite present in the clad layer. Generally, the ferrite content present in the layer is expressed in terms of Ferrite Number (FN). The optimum range of ferrite number provides adequate surface properties like chloride stress corrosion cracking resistance, pitting and crevice corrosion resistance and mechanical properties. For achieving maximum economy and enhanced life, duplex stainless steel (E2209T1-4/1) is deposited on the surface of low carbon structural steel of IS: 2062. The problem faced in the weld cladding towards achieving the required amount of ferrite number is selection of optimum combination of input process parameters. This study concentrates on estimating FN and analysis of input process parameters on FN of heat treated duplex stainless steel cladding. To predict FN, mathematical equations were developed based on four factor five level central composite rotatable design with full replication using regression methods. Then, the developed models were embedded further into integrated ANN-SA to estimate FN. From the results, the integrated ANN-SA is capable of giving maximum FN at optimum process parameters compared to that of experimental, regression and ANN modeling.

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Effect of Post Weld Heat Treatment on Microstructure and Mechanical Properties of Welded 2205 Duplex Stainless Steel

Cited by 19 publications

References 5 publications

Microstructure, Mechanical Behavior and Crystallographic Texture in a Hot Forged Dual Phase Stainless Steel.

Microstructure, Mechanical Behavior and Crystallographic Texture in a Hot Forged Dual Phase Stainless Steel.

Effect of Nitrogen Addition to Shielding Gas on Cooling Rates and in the Microstructure of Thin Sheets of Duplex Stainless Steel Welded by Pulsed Gas Tungsten Arc Welding Process

Optimization of Ferrite Number of Solution Annealed Duplex Stainless Steel Cladding Using Integrated Artificial Neural Network: Simulated Annealing

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