scholarly journals Effect of the Strain Rate on the Fracture Behaviour of High Pressure Pre-Charged Samples

Proceedings ◽  
2018 ◽  
Vol 2 (23) ◽  
pp. 1417
Author(s):  
Guillermo Álvarez Díaz ◽  
Tomás Eduardo García Suárez ◽  
Cristina. Rodríguez González ◽  
Francisco Javier Belzunce Varela
Keyword(s):  
Fracture Toughness ◽  
High Pressure ◽  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
Fracture Behaviour ◽  
Structural Steels ◽  
Gaseous Hydrogen ◽  
Displacement Rate ◽  
Steel Strength ◽  
Fracture Tests

The aim of this work is to study the effect of the displacement rate on the hydrogen embrittlement of two different structural steels grades used in energetic applications. With this purpose, samples were pre-charged with gaseous hydrogen at 19.5 MPa and 450 °C for 21 h. Then, fracture tests of the pre-charged specimens were performed, using different displacement rates. It is showed that the lower is the displacement rate and the largest is the steel strength, the strongest is the reduction of the fracture toughness due to the presence of internal hydrogen.

Effect of High Pressure Gaseous Hydrogen on the Tensile Properties of Four Types of Stainless Steels: Investigation of Materials Properties in High Pressure Gaseous Hydrogen—1

2007 ◽  
Author(s):  
Hideki Nakagawa
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Hydrogen Embrittlement ◽  
Storage System ◽  
Gaseous Hydrogen ◽  
Fuel Cell Vehicle ◽  
Ductility Loss ◽  
Hydrogen Storage System ◽  
Type 316L ◽  
Pressure Hydrogen

Practical application of fuel cell vehicle has started in the world, and high-pressure hydrogen tanks are currently considered to be the mainstream hydrogen storage system for commercially implemented fuel cell vehicle. Application of metallic materials to the components of high-pressure hydrogen storage system: hydrogen tanks, valves, measuring instructions and so on, have been discussed. In this work, tensile properties of four types of stainless steels were evaluated in 45MPa (6527psig) and 75MPa (10878psig) high-pressure gaseous hydrogen at a slow strain rate of 3×10−6 s−1 at ambient temperature. Type 316L (UNS S31603) stainless steel hardly showed ductility loss in gaseous hydrogen, since it had stable austenitic structure. On the other hand, Type 304 (UNS S30400) metastable austenitic stainless steel showed remarkable ductility loss in gaseous hydrogen, which was caused by the hydrogen embrittlement of strain induced martensitic phase. Likewise, Type 205 (UNS S20500) nitrogen-strengthened austenitic stainless steel showed remarkable ductility loss in gaseous hydrogen, though it had stable austenitic structure in the same manner as Type 316L. The ductility loss of Type 205 was due to the hydrogen embrittlement of austenitic phase resulting from the formation of planar dislocation array. Furthermore, Type 329J4L (UNS S31260) duplex stainless steel showed extreme ductility loss in gaseous hydrogen, which was caused by the hydrogen embrittlement of ferritic phase.

Evaluation of Hydrogen Embrittlement of Cr-Mo Low Alloy Steel by Slow Strain Rate Technique With Cathodically Charged Specimen

2017 ◽  
Author(s):  
Daichi Tsurumi ◽  
Hiroyuki Saito ◽  
Hirokazu Tsuji
Keyword(s):  
High Pressure ◽  
Hydrogen Embrittlement ◽  
Fracture Surface ◽  
Strain Rate ◽  
Current Density ◽  
Cleavage Fracture ◽  
Hydrogen Gas ◽  
Low Alloy Steel ◽  
Slow Strain Rate Technique ◽  
Pressure Hydrogen

As an alternative method to slow strain rate technique (SSRT) under high-pressure hydrogen gas evaluation, SSRT was performed with a cathodically charged specimen. Cr-Mo low alloy steel with a tensile strength of 1000 MPa grade was selected as a test material. Cathodic charging was performed in 3% NaCl solution and at a current density in the range of 50–600 A/m2. The effect of specimen size on the hydrogen embrittlement properties was evaluated. Relative reduction of area (RRA) values obtained by tests at a cathode current density of 400 A/m2 were equivalent to those performed in hydrogen gas at pressures of 10 to 35 MPa. Fracture surface observations were also performed using scanning electron microscopy (SEM). The quasi-cleavage fracture surface was observed only after rupture of small specimens that were subjected to hydrogen charged tests. It was also necessary for the diameter of the specimen to be small to form the quasi-cleavage fracture surface. The results indicated that to simulate the high-pressure hydrogen gas test, a specimen with a smaller parallel section diameter that is continuously charged until rupture is preferable.

scholarly journals Hydrogen Embrittlement Properties of Stainless Steels in High Pressure Gaseous Hydrogen Environment

2006 ◽  
Vol 55 (4) ◽  
pp. 139-145 ◽  
Author(s):  
Tomohiko Omura ◽  
Kenji Kobayashi ◽  
Mitsuo Miyahara ◽  
Takeo Kudo
Keyword(s):  
High Pressure ◽  
Hydrogen Embrittlement ◽  
Stainless Steels ◽  
Gaseous Hydrogen ◽  
Hydrogen Environment

Excellent Resistance to Hydrogen Embrittlement of High-Strength Copper-Based Alloy

2017 ◽  
Author(s):  
Yuhei Ogawa ◽  
Junichiro Yamabe ◽  
Hisao Matsunaga ◽  
Saburo Matsuoka
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Hydrogen Embrittlement ◽  
Aging Treatment ◽  
High Strength ◽  
Fatigue Tests ◽  
Gaseous Hydrogen ◽  
Subsequent Aging ◽  
Metallic Material ◽  
Copper Based Alloy

In order to develop more energy-efficient and safer, hydrogen pre-cooling systems destined for use in hydrogen refueling stations, a metallic material must first be researched and found to possess three excellent material properties: high strength, high thermal conductivity and low susceptibility to hydrogen embrittlement (HE). This study investigated the hydrogen compatibility of a beryllium-copper alloy 25 (UNS-C17200), fabricated by a solution annealing at 1053 K and via subsequent aging treatment at 588 K. After these thermal processes, the tensile strength exceeded 1200 MPa, due to the precipitation of nano-sized CuBe compounds (γ’ phase). Slow strain rate tensile (SSRT) and tension-compression fatigue tests were performed using this material, in addition to fatigue crack growth and fracture toughness tests, in laboratory air and in gaseous hydrogen with a pressure of 115 MPa at room temperature. After the SSRT test, the material showed no hydrogen-induced degradation of strength or ductility and, surprisingly, there was also no degradation of fatigue resistance or fracture toughness values in high-pressure gaseous hydrogen. Specifically, it was revealed that the material demonstrated an excellent HE resistance, despite having such a high tensile strength.

Comparison of hydrogen embrittlement in three pipeline steels in high pressure gaseous hydrogen environments

2012 ◽  
Vol 59 ◽  
pp. 1-9 ◽  
Author(s):  
N.E. Nanninga ◽  
Y.S. Levy ◽  
E.S. Drexler ◽  
R.T. Condon ◽  
A.E. Stevenson ◽  
...  
Keyword(s):  
High Pressure ◽  
Hydrogen Embrittlement ◽  
Gaseous Hydrogen ◽  
Pipeline Steels

Fracture Toughness of Structural Steels as a Function of the Rate Parameter T ln A/ε˙

1967 ◽  
Vol 89 (1) ◽  
pp. 86-92 ◽  
Author(s):  
H. T. Corten ◽  
A. K. Shoemaker
Keyword(s):  
Fracture Toughness ◽  
Strain Rate ◽  
High Strain ◽  
Initial Crack ◽  
Structural Steels ◽  
Structure Design ◽  
Strain Rates ◽  
Rate Parameter ◽  
Service Conditions ◽  
Temperature Strain

The influence of temperature and strain rate upon the fracture toughness of structural steel is the question considered in this paper. The hypothesis is proposed that fracture toughness, KIc, for initial crack extension is a single-valued function of the rate parameter T ln A/ε˙. Measurements made by Krafft and Sullivan of fracture toughness, KIc, for three steels covering a range of low temperatures and high strain rates are presented as a function of this rate parameter. Two of the materials support the contention that a single-valued relation exists between KIc and the parameter, while scatter in the data for the third steel does not allow a conclusion. The complexity of design against fracture in structural steels is reviewed. For conservative design it must be assumed that a crack is present in the structure. Design against fracture must insure that the minimum fracture toughness at the service temperature, strain rate and stress is sufficient to prevent this crack from extending rapidly through the base metal. A means of using low temperature laboratory fracture toughness tests for estimating a minimum fracture toughness corresponding to the service conditions is discussed.

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