Hydrogen embrittlement of a Ti-strengthened 250 grade maraging steel

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/s11665-997-0011-6· OSTI ID:477150

Tsay, L W; Huang, W B ^[1]; Li, Y M ^[2]; Chen, C ^[3]

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1. National Taiwan Ocean Univ., Keelung (Taiwan, Province of China). Inst. of Materials Engineering
2. Chung Shan Inst. of Science and Technology, Lungtan (Taiwan, Province of China)
3. National Taiwan Univ., Taipei (Taiwan, Province of China). Inst. of Materials Science and Engineering

Constant extension-rate tensile tests are performed to investigate the effects of strain rate and environmental hydrogen concentration on the tensile properties of various aged T-250 specimens. The 426 C (800 F) underaged specimens are very sensitive to strain rate; the 482 C (900 F) peak-aged specimens exhibit a reduced ductility under low strain rates; and the 593 C (1,100 F) overaged specimens are insensitive to strain rate when tested in air. The excellent resistance to embrittlement of the overaged specimens in gaseous hydrogen could be associated with the extensive formation of reverted austenite and the incoherent Ni{sub 3}Ti precipitates. The tensile-fractured surfaces of such specimens reveal a ductile dimple fracture. However, the peak-aged specimens are susceptible to gaseous hydrogen embrittlement, and the embrittled region shows a primary fracture mode of quasi-cleavage. The least resistant to hydrogen embrittlement of the underaged specimens is characterized by a more brittle fracture appearance, that is, intergranular fracture, under a low strain rate or in the gaseous hydrogen environment.

• Sponsoring Organization: National Science Council, Taipei (Taiwan, Province of China)
• OSTI ID: 477150
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 2 Vol. 6; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ENVIRONMENT
EXPERIMENTAL DATA
FRACTURES
HYDROGEN EMBRITTLEMENT
INTERMETALLIC COMPOUNDS
MARAGING STEELS
PRECIPITATION
STRAIN RATE
TENSILE PROPERTIES