Hydrogen embrittlement of thermomechanically treated 18Ni Maraging steel

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The influence of thermomechanical treatments on susceptibility to cracking in 100 percent relative humidity air and low pressure (93.3 KPa) gaseous hydrogen has been investigated for 18Ni (350 ksi) Maraging steel. Two thermomechanical treatments were studied, ausforming and marforming and compared with the standard solution treated and aged material. Although little difference exists for the strength and toughness values between these treatments, a two to five-fold increase in the stress intensity threshold for cracking was found for both the ausformed and marformed material. A dramatic difference in cracking kinetics was also apparent as shown by the failure times at comparable ... continued below

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Pages: 11

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Munford, J.W.; Rack, H.J. & Kass, W.J. January 1, 1977.

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Description

The influence of thermomechanical treatments on susceptibility to cracking in 100 percent relative humidity air and low pressure (93.3 KPa) gaseous hydrogen has been investigated for 18Ni (350 ksi) Maraging steel. Two thermomechanical treatments were studied, ausforming and marforming and compared with the standard solution treated and aged material. Although little difference exists for the strength and toughness values between these treatments, a two to five-fold increase in the stress intensity threshold for cracking was found for both the ausformed and marformed material. A dramatic difference in cracking kinetics was also apparent as shown by the failure times at comparable stress intensities. Fractographic analysis showed that the primary fracture mode was 100 percent intergranular for the solution treated and aged samples while the ausform and marform failures were predominately quasi-cleavage or intergranular depending on orientation. Finally, permeation and diffusion measurements were conducted on the above materials and these results are correlated with the environmental cracking behavior.

Physical Description

Pages: 11

Notes

Dep. NTIS, PC A02/MF A01.

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  • Conference on environmental degradation of engineering materials, Blacksburg, VA, USA, 10 Oct 1977

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  • Report No.: SAND-77-1087C
  • Report No.: CONF-771010-3
  • Grant Number: EY-76-C-04-0789
  • Office of Scientific & Technical Information Report Number: 5281680
  • Archival Resource Key: ark:/67531/metadc1067466

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1977

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 28, 2018, 1:47 p.m.

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Munford, J.W.; Rack, H.J. & Kass, W.J. Hydrogen embrittlement of thermomechanically treated 18Ni Maraging steel, article, January 1, 1977; United States. (digital.library.unt.edu/ark:/67531/metadc1067466/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.