Hydrogen-enhanced cracking of 2205 duplex stainless steel welds

M. C. Young; S. L.I. Chan; L. W. Tsay; C. S. Shin

doi:10.1016/j.matchemphys.2004.10.042

Hydrogen-enhanced cracking of 2205 duplex stainless steel welds

M. C. Young, S. L.I. Chan, L. W. Tsay, C. S. Shin

Department of Chemical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Slow-displacement rate tensile tests were carried out to investigate the effect of hydrogen embrittlement on notched tensile strength (NTS) and fracture characteristics of 2205 duplex stainless steel weld. The hydrogen embrittlement susceptibility of the specimens was correlated with microstructures of the fusion zone. The results indicated that all the specimens were susceptible to gaseous hydrogen embrittlement but to different degrees. The susceptibility decreased with increasing austenite content in the weld metal. The orientation with respect to the rolling direction had a great influence on the impact toughness of the base plate. Preheating before welding or changing the plasma-assisted gas from He to N₂ could raise the γ content of the fusion zone and improve the impact toughness. In case of the post-weld heat-treated weld (PW), the presence of randomly oriented acicular and blocky γ in the fusion zone led to the highest impact energy and NTS among the specimens being tested. Scanning electron microscopy (SEM) fractographs revealed that all specimens underwent a significant change in fracture mode from ductile in air to quasi-cleavage fracture in H₂.

Original language	English
Pages (from-to)	21-27
Number of pages	7
Journal	Materials Chemistry and Physics
Volume	91
Issue number	1
DOIs	https://doi.org/10.1016/j.matchemphys.2004.10.042
State	Published - 15 May 2005

Keywords

Charpy impact
Duplex stainless steel
Gaseous hydrogen embrittement
Laser welding
Notched tensile test
Quasi-cleavage

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10.1016/j.matchemphys.2004.10.042

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title = "Hydrogen-enhanced cracking of 2205 duplex stainless steel welds",

abstract = "Slow-displacement rate tensile tests were carried out to investigate the effect of hydrogen embrittlement on notched tensile strength (NTS) and fracture characteristics of 2205 duplex stainless steel weld. The hydrogen embrittlement susceptibility of the specimens was correlated with microstructures of the fusion zone. The results indicated that all the specimens were susceptible to gaseous hydrogen embrittlement but to different degrees. The susceptibility decreased with increasing austenite content in the weld metal. The orientation with respect to the rolling direction had a great influence on the impact toughness of the base plate. Preheating before welding or changing the plasma-assisted gas from He to N2 could raise the γ content of the fusion zone and improve the impact toughness. In case of the post-weld heat-treated weld (PW), the presence of randomly oriented acicular and blocky γ in the fusion zone led to the highest impact energy and NTS among the specimens being tested. Scanning electron microscopy (SEM) fractographs revealed that all specimens underwent a significant change in fracture mode from ductile in air to quasi-cleavage fracture in H2.",

keywords = "Charpy impact, Duplex stainless steel, Gaseous hydrogen embrittement, Laser welding, Notched tensile test, Quasi-cleavage",

author = "Young, {M. C.} and Chan, {S. L.I.} and Tsay, {L. W.} and Shin, {C. S.}",

note = "Funding Information: The authors gratefully acknowledge the financial support of this study by National Science Council of Republic China (NSC 92-2216-E-019-009).",

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AU - Young, M. C.

AU - Chan, S. L.I.

AU - Tsay, L. W.

AU - Shin, C. S.

N1 - Funding Information: The authors gratefully acknowledge the financial support of this study by National Science Council of Republic China (NSC 92-2216-E-019-009).

PY - 2005/5/15

Y1 - 2005/5/15

N2 - Slow-displacement rate tensile tests were carried out to investigate the effect of hydrogen embrittlement on notched tensile strength (NTS) and fracture characteristics of 2205 duplex stainless steel weld. The hydrogen embrittlement susceptibility of the specimens was correlated with microstructures of the fusion zone. The results indicated that all the specimens were susceptible to gaseous hydrogen embrittlement but to different degrees. The susceptibility decreased with increasing austenite content in the weld metal. The orientation with respect to the rolling direction had a great influence on the impact toughness of the base plate. Preheating before welding or changing the plasma-assisted gas from He to N2 could raise the γ content of the fusion zone and improve the impact toughness. In case of the post-weld heat-treated weld (PW), the presence of randomly oriented acicular and blocky γ in the fusion zone led to the highest impact energy and NTS among the specimens being tested. Scanning electron microscopy (SEM) fractographs revealed that all specimens underwent a significant change in fracture mode from ductile in air to quasi-cleavage fracture in H2.

AB - Slow-displacement rate tensile tests were carried out to investigate the effect of hydrogen embrittlement on notched tensile strength (NTS) and fracture characteristics of 2205 duplex stainless steel weld. The hydrogen embrittlement susceptibility of the specimens was correlated with microstructures of the fusion zone. The results indicated that all the specimens were susceptible to gaseous hydrogen embrittlement but to different degrees. The susceptibility decreased with increasing austenite content in the weld metal. The orientation with respect to the rolling direction had a great influence on the impact toughness of the base plate. Preheating before welding or changing the plasma-assisted gas from He to N2 could raise the γ content of the fusion zone and improve the impact toughness. In case of the post-weld heat-treated weld (PW), the presence of randomly oriented acicular and blocky γ in the fusion zone led to the highest impact energy and NTS among the specimens being tested. Scanning electron microscopy (SEM) fractographs revealed that all specimens underwent a significant change in fracture mode from ductile in air to quasi-cleavage fracture in H2.

KW - Charpy impact

KW - Duplex stainless steel

KW - Gaseous hydrogen embrittement

KW - Laser welding

KW - Notched tensile test

KW - Quasi-cleavage

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DO - 10.1016/j.matchemphys.2004.10.042

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VL - 91

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JO - Materials Chemistry and Physics

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ER -

Hydrogen-enhanced cracking of 2205 duplex stainless steel welds

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Keywords

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