Metallurgical and Materials Transactions A

, Volume 44, Issue 3, pp 1331–1339 | Cite as

Hydrogen Embrittlement Behavior of 430 and 445NF Ferritic Stainless Steels

  • Sun Mi Kim
  • Young Soo Chun
  • Sung Yeun Won
  • Young Hwan Kim
  • Chong Soo Lee
Symposium: Environmental Damage in Structural Materials under Static/Dynamic Loads at Ambient Temperature


Hydrogen embrittlement behavior of two kinds of commercial ferritic stainless steels (STSs), 430 (UNS S43000) and 445NF (UNS S44536), was investigated by means of a series of cathodical hydrogen charging, slow strain rate tests, bending tests, and thermal desorption spectrometry analyses. The hydrogen concentration in 445NF STS was lower than that of 430 STS under identical hydrogen charging conditions because of the formation of a more passive layer. In addition, 445NF STS exhibited a larger passive range in the potentiodynamic polarization curve. However, resistance to hydrogen embrittlement of 445NF STS was inferior to that of 430 STS because of precipitation of the Laves phase at grain boundaries of the former at annealing temperatures of 873 K to 1123 K (600 °C to 850 °C). Crack propagation was found to occur along the interface between the Laves phase and the matrix. For 445NF STS, dissolution of the Laves phase by solution heat treatment at 1273 K (1000 °C) followed by quenching was effective in terms of suppressing degradation of its mechanical properties and formability, which were related to hydrogen embrittlement.


Passive Film Hydrogen Embrittlement Passive Layer Lave Phase Ferritic Stainless Steel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors are thankful for the financial support from POSCO, Korea.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2012

Authors and Affiliations

  • Sun Mi Kim
    • 1
  • Young Soo Chun
    • 1
  • Sung Yeun Won
    • 2
  • Young Hwan Kim
    • 2
  • Chong Soo Lee
    • 1
    • 3
  1. 1.Department of Materials Science and EngineeringPohang University of Science and TechnologyPohangKorea
  2. 2.Technical Research LaboratoriesPOSCOPohangKorea
  3. 3.Graduate Institute of Ferrous TechnologyPohang University of Science and TechnologyPohangKorea

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