Effect of microstructure on fracture toughness of SUS 329 J1 duplex stainless steel welds.

修, 神谷; 一男, 熊谷; 敏男, 圓城; 靖志, 菊地

doi:10.2207/qjjws.8.105

Cited by 9 publications

(3 citation statements)

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“…Efforts have been made to control the microstructures in welds of duplex stainless steels. [1][2][3][4][5] A reasonable ferrite/austenite balance can be achieved in welds by adjusting the alloy compositions of welding wire or rod and welding parameters, such as weld heat input and inter-pass temperature.…”

Section: Introductionmentioning

confidence: 99%

Nitride Precipitation in Weld HAZs of a Duplex Stainless Steel.

Liao¹

2001

ISIJ International

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Section: Introductionmentioning

confidence: 99%

Nitride Precipitation in Weld HAZs of a Duplex Stainless Steel.

Liao¹

2001

ISIJ International

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“…Duplex stainless steel (DSS) consisting of a dual structure of austenite + ferrite possesses the superior mechanical and corrosion properties, and has been applied to various industrial fields such as petrochemical, power and seawater desalination plants. However, during fusion welding, DSS undergoes the complex microstructural change and phase transformation affecting the / phase balance due to a series of thermal cycles [1][2][3][4]. In previous studies [5,6], the authors have clarified the kinetics of / phase transformation in the heat affected zone (HAZ) of the single pass welds of DSSs.…”

Section: Introductionmentioning

confidence: 99%

Computer Prediction of Phase Fraction in Multipass Weld of Duplex Stainless Steel - Proposal of Microstructural Improvement Welding Process -

Saida

Ogura

Yamashita

et al. 2021

MSF

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Computer simulation of the α/γ phase transformation in multipass weld of duplex stainless steel was made for predicting the distribution of the γ phase fraction in the weld metal (WM) and HAZ. The kinetic equations including rate constants of the dissolution behaviour as well as precipitation behaviour of γ phase were determined by isothermal heat treatment test. Based on the kinetic equations determined, the distribution of the γ phase fraction in multipass weld of duplex stainless steel was calculated applying the incremental method combined with the heat conduction analysis in welding process. The γ phase fraction was reduced in the higher temperature HAZ and WM, however, that in the reheated HAZ and WM was increased and recovered to the base metal level. Microstructural analysis revealed that the calculated results of the γ phase fraction in multipass weld were consistent with experimental ones. Based on the computer prediction, the microstructural improvement welding (“reheat bead welding”) process, with analogous concept to the temper bead welding technique, was newly proposed for recovering the γ phase fraction in weld even in the as-welded situation.

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“…Duplex stainless steels (DSSs) consisting of a dual structure of austenite + ferrite possess the superior mechanical and corrosion properties, and have been applied to various industrial fields such as petrochemical, power and seawater desalination plants. A number of researches on arc-weldability of DSSs has been conducted in order to evaluate/analyse the weld microstructure and joint properties [1][2][3][4][5][6][7][8][9]. However, very few investigation on laser-weldability of DSSs has been reported.…”

Section: Introductionmentioning

confidence: 99%

Hot Cracking Susceptibility in Duplex Stainless Steel Welds

Saida

Ogura

2018

MSF

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The hot cracking (solidification cracking) susceptibility in the weld metals of duplex stainless steels were quantitatively evaluated by Transverse-Varestraint test with gas tungsten arc welding (GTAW) and laser beam welding (LBW). Three kinds of duplex stainless steels (lean, standard and super duplex stainless steels) were used for evaluation. The solidification brittle temperature ranges (BTR) of duplex stainless steels were 58K, 60K and 76K for standard, lean and super duplex stainless steels, respectively, and were comparable to those of austenitic stainless steels with FA solidification mode. The BTRs in LBW were 10-15K lower than those in GTAW for any steels. In order to clarify the governing factors of solidification cracking in duplex stainless steels, the solidification segregation behaviours of alloying and impurity elements were numerically analysed during GTAW and LBW. Although the harmful elements to solidification cracking such as P, S and C were segregated in the residual liquid phase in any joints, the solidification segregation of P, S and C in LBW was inhibited compared with GTAW due to the rapid cooling rate in LBW. It followed that the decreased solidification cracking susceptibility of duplex stainless steels in LBW would be mainly attributed to the suppression of solidification segregation of P, S and C.

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Effect of microstructure on fracture toughness of SUS 329 J1 duplex stainless steel welds.

Cited by 9 publications

References 0 publications

Nitride Precipitation in Weld HAZs of a Duplex Stainless Steel.

Nitride Precipitation in Weld HAZs of a Duplex Stainless Steel.

Computer Prediction of Phase Fraction in Multipass Weld of Duplex Stainless Steel - Proposal of Microstructural Improvement Welding Process -

Hot Cracking Susceptibility in Duplex Stainless Steel Welds

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