Effect of Nitrogen Partitioning on Yield Strength in Nitrogen-Alloyed Duplex Stainless Steel During Annealing

Jang, Min‐Ho; Moon, Joonoh; Lee, Tae‐Ho; Park, Seongjun; Han, Heung Nam

doi:10.1007/s11661-014-2210-8

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…However, in base metal, the hardness values of austenite are approximately in close values with δ-ferrite from Table 6. Authors have indicated in their research that raising the nitrogen content preferentially strengthens the austenite by interstitial solid solution hardening rather than δ-ferrite [1,14]. Min Ho Jang et al declared that "the austenite becomes stronger than the ferrite when nitrogen content partitioned into austenite is higher than 0.5 wt % [14].…”

Section: Micro-hardness Profilesmentioning

confidence: 99%

“…Furthermore, raising the nitrogen content preferentially strengthens the austenite by interstitial solid solution hardening to the point where it becomes stronger than the ferrite. For low nitrogen contents (<0.1%) the austenite has the lower yield strength while at higher levels (>0.2%) the ferrite becomes the weaker phase [1,14]. As large amounts of carbon is undesirable in stainless steels, due to the risk of sensitization, the addition of nitrogen is preferred.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Nitrogen Gas on Microstructural and Mechanical Properties of TIG Welded S32205 Duplex Stainless Steel

Başyiğit

Kurt

2018

Metals

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Duplex stainless steels are gaining greater interest due to their increasing amounts of application fields. Accordingly, there is a need for awareness of problems associated with improper microstructural distributions such as δ-ferrite (delta-ferrite), austenite and other important intermetallic phases that may form in these steel weldments. Since δ-ferrite versus austenite ratio profoundly influences corrosion and mechanical properties, optimum δ-ferrite ratios must be kept approximately within 35-65 vol % and balance austenite to maintain satisfactory corrosion and mechanical properties on welding of these steels. Cooling rates of welds and alloying elements in base metal are the major factors that determine the final microstructure of these steels. In this work, 3 mm thickness of 2205 duplex stainless-steel plates were TIG (Tungsten Inert Gas) welded with various amounts of nitrogen gas added to argon shielding gas. Specimens were joined within the same welding parameters and cooling conditions. As nitrogen is a potential austenite stabilizer and an interstitial solid solution hardener, the effects of nitrogen on mechanical properties such as hardness profiles, grain sizes and microstructural modifications are investigated thoroughly by changing the welding shielding gas compositions. Increasing the nitrogen content in argon shielding gas also increases the amount of austenitic phase while δ-ferrite ratios decreases. Nitrogen spherodized the grains of austenitic structure much more than observed in δ-ferrite. The strength values of specimens that welded with the addition of nitrogen gas into the argon shielding gas are increased more in both austenitic and delta-ferritic structure as compared to specimens that welded with plain argon shielding gas. The addition of 1 vol % of nitrogen gas into argon shielding gas provided the optimum phase balance of austenite and δ-ferrite in S32205 duplex stainless-steel TIG-welded specimens.

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Section: Micro-hardness Profilesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effects of Nitrogen Gas on Microstructural and Mechanical Properties of TIG Welded S32205 Duplex Stainless Steel

Başyiğit

Kurt

2018

Metals

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“…In DSS, it increases the microhardness of both ferrite (α) and austenite (γ) phase, with a more pronounced effect on γ [22], because this phase can dissolve higher nitrogen amounts. For this reason, in DSS the γ phase becomes the strongest one at N concentrations higher than 0.12 wt.% [23,24]. On the other side, it is reported to reduce the stacking fault energy (SFE) of austenite phase, so promoting planar slip and easier passive film breakdown, when slip/dissolution mechanism is involved in SCC [25,26].…”

Section: Introductionmentioning

confidence: 99%

Effect of brief thermal aging on stress corrosion cracking susceptibility of LDSS 2101 in the presence of chloride and thiosulphate ions

et al. 2018

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“…In duplex stainless steels, nitrogen was mostly distributed in austenite [32], so PREN values were higher in austenite than in ferrite. In other words, when the nitrogen content of filler metal was 0.15 wt%, the nitrogen content of austenite was 0.3 wt% higher than that of ferrite, the PREN value of austenite was higher than that of ferrite by about 4.…”

Section: Corrosion and Mechanical Propertiesmentioning

confidence: 96%

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 Nitrogen Partitioning on Yield Strength in Nitrogen-Alloyed Duplex Stainless Steel During Annealing

Cited by 12 publications

References 11 publications

The Effects of Nitrogen Gas on Microstructural and Mechanical Properties of TIG Welded S32205 Duplex Stainless Steel

The Effects of Nitrogen Gas on Microstructural and Mechanical Properties of TIG Welded S32205 Duplex Stainless Steel

Effect of brief thermal aging on stress corrosion cracking susceptibility of LDSS 2101 in the presence of chloride and thiosulphate ions

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

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