Fatigue Life Properties of Austenitic Stainless Steel Welds in High-pressure Hydrogen Gas

2017 ◽  
Vol 2017 (0) ◽  
pp. OS1804
Author(s):  
Masami NAKAMURA ◽  
Saburo OKAZAKI ◽  
Hisao MATSUNAGA ◽  
Saburo MATSUOKA
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Fatigue Life ◽  
Austenitic Stainless Steel ◽  
Hydrogen Gas ◽  
Steel Welds ◽  
Pressure Hydrogen

Effect of High Pressure Gaseous Hydrogen on Fatigue Properties of SUS304 and SUS316 Austenitic Stainless Steel

2018 ◽  
Author(s):  
Takashi Iijima ◽  
Hirotoshi Enoki ◽  
Junichiro Yamabe ◽  
Bai An
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Fatigue Life ◽  
Austenitic Stainless Steel ◽  
Room Temperature ◽  
Hydrogen Gas ◽  
Gaseous Hydrogen ◽  
Life Test ◽  
Air Atmosphere ◽  
Fatigue Life Test

A high pressure material testing system (max. pressure: 140 MPa, temperature range: −80 ∼ 90 °C) was developed to investigate the testing method of material compatibility for high pressure gaseous hydrogen. In this study, SSRT and fatigue life test of JIS SUS304 and SUS316 austenitic stainless steel were performed in high pressure gaseous hydrogen at room temperature, −45, and −80 °C. These testing results were compared with those in laboratory air atmosphere at the same test temperature range. The SSRT tests were performed at a strain rate of 5 × 10−5 s−1 in 105 MPa hydrogen gas, and nominal stress-strain curves were obtained. The 0.2% offset yield strength (Ys) did not show remarkable difference between in hydrogen gas and in laboratory air atmosphere for SUS304 and SUS316. Total elongation after fracture (El) in hydrogen gas at −45 and −80 °C were approximately 15 % for SUS304 and 20% for SUS316. In the case of fatigue life tests, a smooth surface round bar test specimen with a diameter of 7 mm was used at a frequency of 1, 0.1, and 0.01 Hz under stress rate of R = −1 (tension-compression) in 100 MPa hydrogen gas. It can be seen that the fatigue life test results of SUS304 and SUS316 showed same tendency. The fatigue limit at room temperature in 100 MPa hydrogen gas was comparable with that in laboratory air. The room temperature fatigue life in high pressure hydrogen gas appeared to be the more severe condition compared to the fatigue life at low temperature. The normalized stress amplitude (σa / Ts) at the fatigue limit was 0.37 to 0.39 for SUS304 and SUS316 austenitic stainless steels, respectively.

Mechanical Properties of a New Nitrogen-Strengthened Stainless Steel With Reduced Amount of Ni and Mo in High Pressure Gaseous Hydrogen

2013 ◽  
Author(s):  
Kazuhisa Matsumoto ◽  
Shinichi Ohmiya ◽  
Hideki Fujii ◽  
Masaharu Hatano
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
High Strength ◽  
Hydrogen Gas ◽  
Fracture Surfaces ◽  
Growth Properties ◽  
Pressure Hydrogen

To confirm a compatibility of a newly developed high strength stainless steel “NSSC STH®2” for hydrogen related applications, tensile and fatigue crack growth properties were evaluated in high pressure hydrogen gas up to 90MPa. At temperatures between −40 and 85°C, no conspicuous deterioration of tensile properties including ductility was observed even in 90 MPa hydrogen gas at −40°C while strength of STH®2 was higher than SUS316L. Although a slight drop of reduction of area was recognized in one specimen tested in 90 MPa hydrogen gas at −40°C, caused by the segregation of Mn, Ni and Cu in the laboratory manufactured 15mm-thick plate, it was considerably improved in the large mill products having less segregation. Fatigue crack growth rates of STH®2 in high pressure hydrogen gas were almost the same as that of SUS316L in air. Although fatigue crack growth rate in air was considerably decelerated and lower than that in hydrogen gas at lower ΔK region, this was probably caused by crack closure brought by oxide debris formed on the fracture surfaces near the crack tip by the strong contact of the fracture surfaces after the fatigue crack was propagated. By taking the obtained results into account, it is concluded that NSSC STH®2 has excellent properties in high pressure hydrogen gas in addition to high strength compared with standard JIS SUS316L.

Effect of δ-ferrite on susceptibility to hydrogen embrittlement of 304 austenitic stainless steel in high-pressure hydrogen atmosphere

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fan Bao ◽  
Kaiyu Zhang ◽  
Zhengrong Zhou ◽  
Wenli Zhang ◽  
Xiao Cai ◽  
...  
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Fatigue Crack ◽  
Hydrogen Embrittlement ◽  
Hydrogen Gas ◽  
304 Stainless Steel ◽  
Content Type ◽  
Gas Environment ◽  
Type 304 ◽  
Pressure Hydrogen

Purpose The purpose of this paper is to demonstrate the effect of δ-ferrite on the susceptibility to hydrogen embrittlement of type 304 stainless steel in hydrogen gas environment. Design/methodology/approach The mechanical properties of as-received and solution-treated specimens were investigated by the test of tensile and fatigue crack growth (FCG) in 5 MPa argon and hydrogen. Findings The presence of δ-ferrite reduced the relative elongation and the relative reduction area (H2/Ar) of 304 stainless steel, indicating that δ-ferrite increased the susceptibility of hydrogen embrittlement in 304 stainless steel. Moreover, δ-ferrite promoted the fatigue crack initiation and propagation at the interface between δ-ferrite and austenite. The FCG tests were used to investigate the effect of δ-ferrite on the FCG rate in hydrogen gas environment, and it was found that δ-ferrite accelerated the FCG rate, which was attributed to rapid diffusion and accumulation of hydrogen around the fatigue crack tip through δ-ferrite in high-pressure hydrogen gas environment. Originality/value The dependence of the susceptibility to hydrogen embrittlement on δ-ferrite was first investigated in type 304 steel in hydrogen environment with high pressures, which provided the basis for the design and development of a high strength, hydrogen embrittle-resistant austenitic stainless steel.

Tribological Characterization of Polymeric Sealing Materials in High Pressure Hydrogen Gas

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.

scholarly journals Characteristics of Fatigue Life and Fatigue Crack Growth of SCM435 Steel in High-Pressure Hydrogen Gas

2012 ◽  
Vol 78 (788) ◽  
pp. 531-546 ◽  
Author(s):  
Taisuke MIYAMOTO ◽  
Takashi MATSUO ◽  
Nobuo KOBAYASHI ◽  
Yuki MUKAIE ◽  
Saburo MATSUOKA
Keyword(s):  
High Pressure ◽  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Hydrogen Gas ◽  
Scm435 Steel ◽  
Pressure Hydrogen

Effect of Hydrogen on Tensile and Fatigue Properties of SUS301 Austenitic Stainless Steel

2019 ◽  
Author(s):  
Takashi Iijima ◽  
Hirotoshi Enoki ◽  
Junichiro Yamabe ◽  
Mitsuo Kimura ◽  
Bai An
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Austenitic Stainless Steel ◽  
Fracture Surface ◽  
Austenitic Stainless Steels ◽  
Testing Temperature ◽  
Total Elongation ◽  
Hydrogen Gas ◽  
Fatigue Properties ◽  
Hydrogen Charging

Abstract SSRT and fatigue life tests of SUS301 austenitic stainless steel were performed to examine the effect of hydrogen on the mechanical properties. Ni content of SUS301, 6.00–8.00 mass%, is lower than that of SUS304 in JIS standard for austenitic stainless steels. In the case of SSRT tests, specimens with and without hydrogen charging were tested in laboratory air at room temperature (R.T.), −45 °C, and −80 °C. The 0.2% offset yield strength (Ys) of the hydrogen charged specimens was less than 300 MPa in the tested temperature range. The tensile strength (Ts) and total elongation (El) of hydrogen charged specimens decreased remarkably. With decreasing testing temperature, fracture surface facet of the hydrogen charged specimens became dominant. Therefore, the effect of hydrogen on the tensile properties of SUS301 is supposed to be large. Specimens with and without hydrogen charging were fatigued in laboratory air at R.T., and specimens without hydrogen charging were fatigued in 100 MPa hydrogen gas atmosphere at R.T. Number of cycles (Nf) at finite fatigue life region of the hydrogen charged specimens and of the specimens tested in hydrogen gas were two orders shorter than that of the specimens tested in air. However, the finite fatigue life region of the hydrogen charged specimens and the specimens tested in hydrogen gas showed a different profile. Additionally, ferrite equivalents of all fatigue tested specimens and fatigued fracture surface morphology suggested the fatigue fracture mechanism between the hydrogen charged specimens tested in air and the non-charged specimens tested in 100 MPa hydrogen gas seems to be different. Therefore, further investigations are required to clear this difference.

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

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.

Sign in / Sign up

Export Citation Format

Share Document