Improved resistance to hydrogen environment embrittlement of warm-deformed 304 austenitic stainless steel in high-pressure hydrogen atmosphere

SUS 304 austenitic stainless steel was subjected to severe plastic deformation (SPD) by the method of high pressure torsion (HPT). From a fully austenitic matrix (γ), HPT resulted in phase transformation to give a two phase structure of austenite (γ) and martensite (α') by the transformation γα'. The phase transformation was accompanied by an increase in hardness (Hv) from 1.6 GPa in the as annealed form to 5.4 GPa in the deformed state. Subsequent annealing in temperature range 250oC to 450oC resulted in an increase in both α' volume fraction and hardness (6.4 GPa). Annealing at 600oC resulted in a decrease in α' volume fraction hardness.

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Effects of Hydrogen Environment on Fatigue Characteristics in a Type 304 Austenitic Stainless Steel

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.71.443 ◽

2005 ◽

Vol 71 (703) ◽

pp. 443-450 ◽

Cited By ~ 4

Author(s):

Kyohei KAWAMOTO ◽

Yuta AOKI ◽

Yasuji ODA ◽

Hiroshi NOGUCHI ◽

Kenji HIGASHIDA

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Hydrogen Environment ◽

304 Austenitic Stainless Steel ◽

Fatigue Characteristics ◽

Type 304

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Tribological Characterization of Polymeric Sealing Materials in High Pressure Hydrogen Gas

STLE/ASME 2010 International Joint Tribology Conference ◽

10.1115/ijtc2010-41238 ◽

2010 ◽

Author(s):

Yoshinori Sawae ◽

Kanao Fukuda ◽

Eiichi Miyakoshi ◽

Shunichiro Doi ◽

Hideki Watanabe ◽

...

Keyword(s):

High Pressure ◽

Stainless Steel ◽

Wear Behavior ◽

Hydrogen Gas ◽

Gaseous Hydrogen ◽

Surface Oxide Layer ◽

Chemical Compositions ◽

Hydrogen Environment ◽

Sealing Materials ◽

Pressure Hydrogen

Bearings and seals used in fuel cell vehicles and related hydrogen infrastructures are operating in pressurized gaseous hydrogen. However, there is a paucity of available data about the friction and wear behavior of materials in high pressure hydrogen gas. In this study, authors developed a pin-on-disk type apparatus enclosed in a high pressure vessel and characterized tribological behavior of polymeric sealing materials, such as polytetrafluoroethylene (PTFE) based composites, in gaseous hydrogen pressurized up to 40 MPa. As a result, the friction coefficient between graphite filled PTFE and austenitic stainless steel in 40 MPa hydrogen gas became lower compared with the friction in helium gas at the same pressure. The chemical composition of worn surfaces was analyzed by using X-ray photoelectron spectrometer (XPS) after the wear test. Results of the chemical analysis indicated that there were several differences in chemical compositions of polymer transfer film formed on the stainless disk surface between high pressure hydrogen environment and high pressure helium environment. In addition, the reduction of surface oxide layer of stainless steel was more significant in high pressure hydrogen gas. These particular effects of the pressurized hydrogen gas on the chemical condition of sliding surfaces might be responsible for the tribological characteristics in the high pressure hydrogen environment.

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Effect of Hydrogen Environment on Non-Propagation and Propagation of Fatigue Crack in a Type 304 Austenitic Stainless Steel

Experimental Analysis of Nano and Engineering Materials and Structures ◽

10.1007/978-1-4020-6239-1_112 ◽

2007 ◽

pp. 227-228

Author(s):

H. Matsuno ◽

Y. Aoki ◽

Y. Oda ◽

H. Noguchi

Keyword(s):

Stainless Steel ◽

Fatigue Crack ◽

Austenitic Stainless Steel ◽

Hydrogen Environment ◽

304 Austenitic Stainless Steel ◽

Type 304

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Study on Hydrogen Compatibility of S31603 Weld Joints in 98MPa Gaseous Hydrogen

Volume 6B: Materials and Fabrication ◽

10.1115/pvp2018-84453 ◽

2018 ◽

Author(s):

Qi He ◽

Zhengli Hua ◽

Jinyang Zheng

Keyword(s):

High Pressure ◽

Stainless Steel ◽

Austenitic Stainless Steel ◽

Gaseous Hydrogen ◽

Weld Joints ◽

Secondary Cracks ◽

Fracture Behaviors ◽

Tensile Data ◽

Fracture Features ◽

Pressure Hydrogen

Austenitic stainless steel of the 300 series and their welds are widely employed in the production, storage and distribution infrastructures of gaseous and liquid hydrogen. However, hydrogen compatibility of their welds has not been completely understood, especially in high-pressure hydrogen environment. In this study, the influence of 98MPa high pressure gaseous hydrogen on the tensile properties and fracture behaviors of three kinds of S31603 weld joints were investigated, including SMAW, SAW and TIG welds. The tensile data indicated that hydrogen caused the ductility loss of the SAW and TIG weld joints, particularly for the TIG welds. For the SMAW weld joints, hydrogen had little impact on its ductility. Fractographic analysis revealed that hydrogen scarcely induced a change in the fracture mode of the SMAW welds. Different from this, the SAW and TIG welds were found to exhibit an obvious susceptibility to hydrogen embrittlement in this study, particularly for the TIG welds, based on the change of fracture features from dimples to facets, striations and secondary cracks. Additionally, both fracture surfaces of the SMAW and SAW welds contained some inclusions where the secondary cracks were promoted.

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