Session: MF-02-04 Materials for Hydrogen Service-High Alloy Materials 1

Paper Number: 123397

123397 - The Mechanical Behavior of Corrosion Resistant Alloys at Elevated Temperature With Internal Hydrogen 

Structural materials used in combustion or power generation systems need to have both environmental and temperature resistance to ensure long-term performance. As the energy sector transitions to hydrogen, there is a need to ensure compatibility of highly-alloyed austenitic steels and nickel-based alloys with hydrogen over a range of temperatures. Hydrogen embrittlement of these alloy systems is often considered most detrimental near ambient temperatures, although there is some evidence in the literature that hydrogen can affect creep behavior at elevated temperature. In the intermediate temperature range (e.g., 100-400˚C), it is uncertain whether hydrogen degradation of mechanical properties will be of concern. In this study, three alloys (304L, IN625, Hastelloy X) commonly used in power generation systems were thermally precharged with hydrogen and subsequently tensile tested to failure in air at temperatures ranging from 20°C to 200°C. At 20°C, the hydrogen-precharged condition for all materials exhibited loss in ductility with relative reduction of areas ranging between 31% and 56%. The three alloys exhibited different trends with temperature but, in general, the relative reduction of areas improved with increasing temperature tending towards non-charged behavior. Tests were performed at a nominal strain rate of 2 x 10^-3 s^-1 in order to minimize loss of hydrogen during elevated temperature testing. Hydrogen contents from the grip sections were measured both before and after testing and remained within 10% of starting content for 100°C tests and within 16% for 200°C tests.

 

Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525.

Presenting Author: Joe Ronevich Sandia National Laboratories

Presenting Author Biography: Joe is a Principal Member of the technical staff at Sandia since 2012 where his focus has been on evaluating structural metal performance in high-pressure gaseous hydrogen.

Authors:

Joe Ronevich Sandia National Laboratories
Chris San Marchi Sandia National Laboratories
Santosh Narasimhachary Siemens Technology
Frans Palmert Siemens Energy AB
Shilun Sheng Siemens Energy
Stefan Wanjura Siemens Energy