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

[+] Author Affiliations
Yuhei Ogawa, Junichiro Yamabe, Hisao Matsunaga, Saburo Matsuoka

Kyushu University, Fukuoka, Japan

Paper No. PVP2017-65532, pp. V01AT01A043; 8 pages
doi:10.1115/PVP2017-65532
From:
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 1A: Codes and Standards
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5790-8
  • Copyright © 2017 by ASME

abstract

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.

Copyright © 2017 by ASME

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