Effect of weld metal ferrite content on mechanical properties and stress corrosion cracking resistance in 22 Cr 5 Ni duplex stainless steel

Nanavati, Purvesh K.; Kotecki, D. J.; Soman, S.N.

doi:10.1007/s40194-019-00708-1

Cited by 7 publications

(1 citation statement)

References 6 publications

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“…Wang et al investigated the influence of δ-ferrite on the SCC behaviour of type 321 stainless steel in solutions simulating a light water reactor environment and found that the presence of delta ferrite hinders the crack, promotes crack branching and reduces the stress intensity at the crack tip [16]. Nanavati et al probed the effect of delta ferrite in weld metal on the mechanical properties and SCC behaviour of the duplex stainless steel [17]. Fu et al studied the SCC behaviour of stainless steel weld joints fabricated by a laser-arc hybrid welding process and showed that the weld joints exhibited lower susceptibility to SCC than the base material [18].…”

Section: Introductionmentioning

confidence: 99%

SCC behaviour of laser and hybrid laser welded stainless steel weld joints

Ragavendran

Toppo

Vasudevan

2022

Materials Science and Technology

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In this study, stress corrosion cracking (SCC) resistance was evaluated for type 316LN stainless steel weld joints fabricated by advanced welding techniques such as Laser, Hybrid Laser – Tungsten inert gas (HLT) and Hybrid Laser – Metal inert gas (HLM) welding. 316 LN stainless steel base metal exhibited significantly better resistance to SCC. The solidification mode, secondary dendritic arm spacing (SDAS) and tensile residual stress distribution in the weld metal was found to strongly influence SCC resistance of 316LN stainless steel weld joints. The weld joint processed by HLM process exhibited the highest time to failure during SCC testing and hence better SCC resistance due to primary ferritic mode of solidification, finer SDAS and lower width of tensile residual stress distribution.

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Section: Introductionmentioning

confidence: 99%

SCC behaviour of laser and hybrid laser welded stainless steel weld joints

Ragavendran

Toppo

Vasudevan

2022

Materials Science and Technology

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Ferrite content measurement in super duplex stainless steel welds

et al. 2018

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Approaches to determining ferrite fraction (%) and ferrite number (FN) were examined for super duplex stainless steel (SDSS) welds. A reference sample was produced by bead-on-plate gas-tungsten arc welding of a type-2507 SDSS plate. By comparing different etchants and measurement practices, it was realized that etching with modified Beraha followed by computerized image analysis (IA) was the most accurate and quickest technique to measure ferrite fraction, which determined the same ferrite fraction (68.0 ± 2.6%) as that measured by electron diffraction backscattered analysis (67.6 ± 2.3%). A Round Robin test was performed on a reference sample at University West, Swerea KIMAB, Outokumpu Stainless, and Sandvik Materials Technology to investigate the repeatability of the technique. The ferrite fraction measurements performed at different laboratories showed very small variations, which were in the range of those seen when changing microscope in the same laboratory. After verification of the technique, the relationship between ferrite fraction and ferrite number (measured with FERITSCOPE®) was determined using 14 single (root) pass welds, including butt, corner, and TV V-, and double V-joint geometries. The best-fit equation found in this study was ferrite number (FN) = 1.1 × ferrite fraction (%). To conclude, the ferrite fraction technique suggested in the present paper was accurate and repeatable, which made it possible to determine a ferrite fraction-ferrite number formula for SDSS singlepass welds.

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