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Title: The Sulfidation of Inconel 738 in H2/H2S/Ar Gas Mixture at 500–900◦C
Authors: W. Kai
Y. T. Lin
C. C. Yu
P. C. Chen
C.-H. Wu
Contributors: 國立臺灣海洋大學:材料工程所
Keywords: sulfidation
Date: 2004-06
Issue Date: 2018-10-26T01:32:14Z
Publisher: Oxidation of Metals
Abstract: 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
(Cr2S3/Cr3S4), while the inner layer contained a mixture of nickel sulfides
and minor amounts of A12S3 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 T850◦C as compared to that measured at lower
temperatures (T<800◦C).
Relation: 61(516)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50814
Appears in Collections:[材料工程研究所] 期刊論文

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