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    <title language="eng">Tensile testing in high pressure gaseous hydrogen using conventional and tubular specimens: Austenitic stainless steels</title>
    <abstract language="eng">Eight commercial austenitic stainless steels were tensile tested in reference atmosphere, in gaseous high-pressure hydrogen and in gaseous hydrogen precharged condition using conventional (CS) and tubular specimens (TS). For all configurations, 0.2 yield strength and ultimate tensile strength were comparable. In reference atmosphere, reduction of area of CS was higher compared to TS, whereas in gaseous high pressure hydrogen reduction of area of CS was lower compared to TS. In gaseous hydrogen precharged condition reduction of area of CS and TS were comparable for the severely affected grades. The differences in necking behavior between CS and TS are explained by different competitions between necking and hydrogen assisted crack initiation and growth especially for the tests in high pressure hydrogen gas.</abstract>
    <parentTitle language="eng">International Journal of Hydrogen Energy</parentTitle>
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    <author>T. Michler</author>
    <author>Tomás Grimault de Freitas</author>
    <author>H. Oesterlin</author>
    <author>C. Fischer</author>
    <author>K. Wackermann</author>
    <author>F. Ebling</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Hydrogen</value>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Hydrogen Embrittlement</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Tensile Test</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Conventional and Tubular Specimen</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Austenitic Stainless Steel</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>High Pressure Gaseous Hydrogen</value>
    </subject>
    <collection role="ddc" number="621">Angewandte Physik</collection>
    <collection role="institutes" number="">9 Komponentensicherheit</collection>
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    <title language="eng">Hollow Specimen Method for Tests in High-Pressure Hydrogen Gas: The Role of Geometry, Surface Quality and Gas Purity</title>
    <abstract language="eng">The hollow specimen technique is a simple and cost-effective method that has the potential to make materials qualification with pressurised gaseous hydrogen widely accessible to academia and industry.&#13;
The feasibility of this method for slow strain tensile tests has been demonstrated in several studies, leading to the establishment of the ISO/TC 164/SC 1/WG 9 ISO committee for its standardisation. Questions have emerged during this process, that currently prevent the method from being standardised for hydrogen testing. These questions relate to specimen geometry, specimen manufacturing and gas quality and are being systematically addressed in the TransHyDE-H2HohlZug project. The first results are presented in this poster.</abstract>
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    <author>Tomás Grimault de Freitas</author>
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      <value>Hydrogen</value>
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    <subject>
      <language>eng</language>
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      <value>Hydrogen Embrittlement</value>
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      <value>Hollow Specimen Technique</value>
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      <language>eng</language>
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      <value>High-Pressure Gaseous Hydrogen</value>
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      <value>Austenitic Stainless Steel</value>
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      <value>H2HohlZug</value>
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    <title language="eng">Hollow Specimen Technique for Tests in High-Pressure Hydrogen Gas: The Path Towards Standardisation and the Case Study of a Pipeline Steel and its Weld</title>
    <abstract language="eng">The hollow specimen technique is a simple method that has the potential to make material qualification with gaseous pressurized hydrogen widely applicable for the hydrogen industry at low cost. The feasibility of this method has been demonstrated in several studies, leading to the establishment of an ISO committee for its standardization. Questions have emerged during this process, that currently prevent the method from being standardized for hydrogen testing. These questions relate to specimen geometry, specimen manufacturing and gas quality and are being systematically addressed in the TransHyDE-H2HohlZug project. The aim is to close the identified gaps towards the standardization of this method for hydrogen testing.&#13;
This contribution presents the structure and milestones of the project, followed by the results regarding the influence of specimen production and its response to hydrogen effects. Depending on the production method, different roughness and residual stresses can be expected on the inner hole surface of the specimens. This is of importance since an increase in stress concentration sites have been found to be associated to a higher severity of hydrogen effects. This influence has been investigated after applying the following machining processes: a) drilled only; b) drilled and reamed; c) drilled and honed; d) electro-discharge machining (EDM) and honed; e) EDM and reamed.&#13;
Roughness measurements using a profilometer, electron back-scatter diffraction (EBSD) analysis and microhardness tests have been performed previous to mechanical testing to infer on the effect of the different production methods on the surface of the inner hole. Next, the specimens were mechanically tested via slow strain rate tensile tests in a argon and in hydrogen, both at 150 bar and room temperature. Here, a strain-rate sensibility analysis was also performed to identify an optimal strain-rate for the mechanical tests. Based on the results an optimal production method is identified and proposed.</abstract>
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    <author>Tomás Grimault de Freitas</author>
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      <language>eng</language>
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      <value>Hollow Specimen Technique</value>
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      <value>High-Pressure Gaseous Hydrogen</value>
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      <value>Austenitic Stainless Steel</value>
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    <subject>
      <language>eng</language>
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      <value>H2HohlZug</value>
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      <language>eng</language>
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      <value>TransHyDE</value>
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    <subject>
      <language>eng</language>
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      <value>Tensile Test</value>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Pipeline Steel</value>
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