Nitrogen loss and effects on microstructure in multipass TIG welding of a super duplex stainless steel

Hosseini, Vahid A.; Wessman, Sten; Hurtig, Kjell; Karlsson, Leif

doi:10.1016/j.matdes.2016.03.011

Cited by 128 publications

(52 citation statements)

References 29 publications

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“…15. Precipitation in highly ferritic regions, on cooling to room temperature in the HTHAZ, is a well-known phenomenon reported in literature [28][29][30][31][32][33]. Higher peak temperatures followed by rapid cooling to temperatures where nitrides are stable increase the nitride content.…”

Section: Nitridesmentioning

confidence: 99%

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

et al. 2018

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Super duplex stainless steel (SDSS) weld metal microstructures, covering the complete temperature range from ambient to liquidus, were produced by arc heat treatment for 1 and 10 min. Temperature modeling and thermodynamic calculations complemented microstructural studies, hardness mapping and sensitization testing. After 1 min, intermetallics such as sigma and chi phase had precipitated, resulting in moderate sensitization at 720-840°C. After 10 min, larger amounts of intermetallics resulted in hardness up to 400 HV0.5 and more severe sensitization at 580-920°C. Coarse and fine secondary austenite precipitated at high and low temperatures, respectively: The finer secondary austenite was more detrimental to corrosion resistance due to its lower content of Cr, Mo, and N as predicted by thermodynamic calculations. Increased hardness and etching response suggest that 475°C embrittlement had occurred after 10 min. Results are summarized as time-temperature-precipitation and property diagrams for hardness and sensitization.

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Section: Nitridesmentioning

confidence: 99%

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

et al. 2018

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“…After welding, the resistance of the HDSS tube to pitting corrosion was produced using N 2 with Ar shielding gas and was increased due to the decrease of α-phase in the HAZ and weld metal. Furthermore, the improved corrosion resistance is assigned to the reduction of Pitting Resistance Equivalent Number (PREN) variation between the α-phase and γ-phase in the weld metal [16,102].…”

Section: Pitting Corrosionmentioning

confidence: 99%

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Mohammed

Ishak

Aqida

et al. 2017

Metals

105

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Abstract:The effects of input heat of different welding processes on the microstructure, corrosion, and mechanical characteristics of welded duplex stainless steel (DSS) are reviewed. Austenitic stainless steel (ASS) is welded using low-heat inputs. However, owing to differences in the physical metallurgy between ASS and DSS, low-heat inputs should be avoided for DSS. This review highlights the differences in solidification mode and transformation characteristics between ASS and DSS with regard to the heat input in welding processes. Specifically, many studies about the effects of heat energy input in welding process on the pitting corrosion, intergranular stress, stress-corrosion cracking, and mechanical properties of weldments of DSS are reviewed.

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“…Moreover, the ferrite grains coarsened up to over 1 mm with the peak temperature holding time of 10 min, which is helpful to study the reformation behavior of intragranular austenite as will be shown in section 3.3. It should be noted that some fine chromium nitrides (CrN or Cr 2 N) precipitated in ferrite due to the rapid reduction of the solubility of nitrogen in ferrite with the decreasing of temperature . They were not selected during the EBSD measurement since they were not within the scope of this study.…”

Section: Resultsmentioning

confidence: 99%

Reformation Behavior of Austenite in 2205 Duplex Stainless Steel with Rapid Heat Treatment

Wang

et al. 2018

steel research int.

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The reformation behavior of austenite in coarsened ferrite grains of 2205 duplex stainless steel is studied by means of rapid heat treatment process. With the prolongation of peak temperature holding time, ferrite grains coarsen significantly from 200 µm at 1 s to over 1000 µm at 10 min, and the reformation of grain boundary austenite is suppressed while fine equiaxed intragranular austenite is promoted during the subsequent isothermal treatment at 850 °C owing to the reduction of total ferrite grain boundary area. With the decreasing of isothermal temperature, the microstructure evolution of reformed austenite from widmanstatten austenite to acicular austenite and finally to equiaxed austenite is observed, due to the increasing of the nucleation site density. The orientation relationships (OR) between reformed austenite and ferrite vary at different isothermal temperatures. The N‐W OR gradually changes into the K‐S OR with the increasing of isothermal temperature to lower the coherent elastic strain energy induced in ferrite matrix.

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Nitrogen loss and effects on microstructure in multipass TIG welding of a super duplex stainless steel

Cited by 128 publications

References 29 publications

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Reformation Behavior of Austenite in 2205 Duplex Stainless Steel with Rapid Heat Treatment

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