The sulfidation of inconel 738 in H2/H2S/Ar gas mixture at 500-900°C

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
View graph of relations

Author(s)

  • W. Kai
  • Y. T. Lin
  • C. C. Yu
  • P. C. Chen
  • C. H. Wuf

Detail(s)

Original languageEnglish
Pages (from-to)507-527
Journal / PublicationOxidation of Metals
Volume61
Issue number5-6
Publication statusPublished - Jun 2004
Externally publishedYes

Abstract

The sulfidation behavior of the cast nickel-base superalloy Inconel 738 (IN-738) was studied over the temperature range 500-900°C in three various ratios of H2/H2S/Ar atmospheres having sulfur partial pressures in the range 10-4-102 Pa. The sulfidation kinetics followed the parabolic rate law in all cases, and the sulfidation rates increased with increasing temperature and sulfur partial pressure. In general, the scales formed were heterophasic and duplex, consisting of an outer layer composed mostly of nickel sulfides (mostly NiS and Ni3S2, and minor Ni7S6 detected at T>750°C) plus some CoS2/Co3S4, CoMo2S4 NiCo2S4, and minor chromium sulfide (Cr2S 3/Cr3S4), while the inner layer contained a mixture of nickel sulfides and minor amounts of Al2S3 and Cr2S3/Cr3S4. The amount of NiS decreased and that of Ni3S2 increased with increasing temperature. The dependence of the sulfidation rate constants (Kp) and Ps2(the n value) was significantly higher at T≥850°C as compared to that measured at lower temperatures (T ≤ 800°C).

Research Area(s)

  • CoMo2S 4, Ni3S2, NiS, Sulfldation, IN-738

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

The sulfidation of inconel 738 in H2/H2S/Ar gas mixture at 500-900°C. / Kai, W.; Lin, Y. T.; Yu, C. C.; Chen, P. C.; Wuf, C. H.

In: Oxidation of Metals, Vol. 61, No. 5-6, 06.2004, p. 507-527.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review