Internal hydrogen effects on tensile properties of iron- and nickel-base superalloys

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (USA)

DOI:https://doi.org/10.1007/BF02782416· OSTI ID:6730973

Hicks, P D; Altstetter, C J ^[1]

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1. Illinois Univ., Urbana, IL (USA). Dept. of Materials Science and Engineering

Two nickel-base alloys (IN718) and (IN625) and one iron-base superalloy (A286) have been chosen to study the effects of internal H charging on their room-temperature slow strain rate mechanical behavior.Uniform internal H contents ranged from 0 to 50 wt ppm H (0 to 3000 at. ppm H), and a strain rate of 8.5 {times} 10{sup {minus} 7} m/s was used with notched strip specimens. The three alloys showed varying losses in strength and ductility, and the strongest alloy, IN718, showed a decrease of 67 pct in ductility for a dissolved H content of 40 wt ppm. Superalloy A286 showed a corresponding 50 pct decrease in ductility, and IN625 showed a 29 pct loss in ductility. Fractographic evidence and the decrease in strength lead the authors to conclude that the enhanced localized plasticity mechanism for H embrittlement is possibly operative in these face-centered cubic (fcc) alloys.

• OSTI ID: 6730973
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (USA), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (USA) Vol. 21:2; ISSN MTTAB; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY-NI53CR19FE19NB5MO3
ALLOY-NI61CR22MO9NB4FE3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DUCTILITY
EMBRITTLEMENT
FCC LATTICES
FRACTOGRAPHY
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN EMBRITTLEMENT
INCONEL 625
INCONEL 718
INCONEL ALLOYS
IRON ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM A
NIOBIUM AL
TENSILE PROPERTIES