Thermal oxidation behaviors and structures of Fe-9Cr-1Mo alloy

被引:2
作者
Betancur, J. D. [1 ]
Perez Alcazar, G. A. [2 ]
Nomura, K. [3 ]
Wang, C. J. [4 ]
Tabares, J. A. [2 ]
机构
[1] Escuela Colombiana Ingn Julio Garavito, Dept Ciencias Nat, AK 45,205-59 Autopista Norte, Bogota, Colombia
[2] Univ Valle, Dept Ciencias Nat, Cali 25360, Colombia
[3] Tokyo Univ Sci, Shinjuku Ku, Kagurazaka 1-3, Tokyo 1628601, Japan
[4] Natl Taiwan Univ Sci & Technol, Dept Mech Engn, 43 Keelung Rd,Sect 4, Taipei 106, Taiwan
来源
HYPERFINE INTERACTIONS | 2017年 / 238卷
关键词
Isothermal oxidation; Fe-9Cr-1Mo alloy; CEMS; Mossbauer spectroscopy; WATER-VAPOR; STEEL;
D O I
10.1007/s10751-017-1462-2
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
Isothermal oxidation behaviors of Fe-9Cr-1Mo alloy were investigated at 600, 700, 750 and 850 degrees C for 72 h in air atmosphere. The oxidation rates were measured using a thermogravimetric analyzer (TGA). The structure and composition of the oxide scale were characterized by X-ray diffraction (XRD), energy dispersive spectrometry (EDS) and conversion electron Mossbauer spectrometry (CEMS). In this study it was found that the oxide layers form duplex structures consisting of Fe and Cr oxides. CEMS spectra are composed of one doublet due to dispersed Fe3+ in Cr2O3 oxidation layers produced at high temperatures and two magnetic components due to Fe-Cr-Mo alloy substrate and hematite (Fe, Cr)(2)O-3 with lower hyperfine field than pure hematite (52 T). Fe rich oxides are formed at the surface by oxidation at relatively low temperatures of 600 degrees C and 700 degrees C, while Cr rich (Fe, Cr)-oxides are formed in the top surface layers by oxidation at higher than 750 degrees C.
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页数:10
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