On the mechanism of a hydrogen peak of internal friction in high-alloyed fcc iron

Journal Article · Tue May 12 04:00:00 EDT 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00107-9· OSTI ID:619521

Asano, Shigeru; Shimada, Yoshiharu ^[1]; Usui, Makoto ^[2]

---

1. Nagoya Inst. of Tech. (Japan). Dept. of Materials Science and Engineering
2. Aichi Steel Works, Ltd., Tokai (Japan). Research Div.

In 1975, an internal friction peak was found for the type-310 austenitic stainless steel subjected to electrolytic hydrogen charging and attributed to some hydrogen-related relaxation. Since that time, this kind of a hydrogen internal friction peak has been confirmed for all types of austenitic stainless steels and also for many iron-base FCC alloys. Most investigators have assumed that this hydrogen peak originates in a Snoek-type relaxation of hydrogen complexes dissolved in the FCC iron lattice, like that of interstitial solute atoms in the BCC iron lattice. However, there is a controversy on the structure of hydrogen complexes. Recent discussion is focused on two possibilities; the hydrogen-hydrogen pairs (H-H pairs) and the hydrogen-substitutional solute pairs (H-S pairs). In order to discriminate the above two possibilities, it is necessary to clarify the relationship between relaxation strength and hydrogen concentration. The purpose of this paper is to examine such a relationship in detail for the hydrogen peak of internal friction in Fe-45Ni and Fe-35Ni alloys together with austenitic stainless steel, by employing the gas-phase method for hydrogen charging in place of the usual electrolytic method.

• OSTI ID: 619521
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 12 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITIC STEELS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
HYDROGEN
INTERNAL FRICTION
IRON BASE ALLOYS
NICKEL ALLOYS