High Temperature Oxidation Study of Nano-Y2O3Dispersed Ferritic Alloys Synthesized by Mechanical Alloying and Sintering

被引：4
作者：
Meharwal, A. [1 ]
Kumar, M. [1 ]
Karak, S. K. [1 ]
Majumdar, J. Dutta [1 ]
Manna, I. [1 ]
机构：
[1] Indian Inst Technol Kharagpur, Met & Mat Engn Dept, Kharagpur 721302, W Bengal, India
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2020年 / 51卷 / 10期
关键词：
MICROSTRUCTURE; STEEL; DIFFUSION; CR;
D O I：
10.1007/s11661-020-05918-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study concerns mechanism and kinetics of isothermal oxidation of four Fe-Cr-Al-Ti ferritic alloys in the range 700 degrees C to 900 degrees C for up to 50 hours in air. These four alloys with nominal compositions of 83.0Fe-13.5Cr-2.0Al-0.5Ti (alloy A), 79.0Fe-17.5Cr-2.0Al-0.5Ti (alloy B), 75.0Fe-21.5Cr-2.0Al-0.5Ti (alloy C), and 71.0Fe-25.5Cr-2.0Al-0.5Ti (alloy D) each with 1.0 wt pct nano-Y(2)O(3)dispersion were synthesized by mechanical alloying and sintering at 1000 degrees C by hot isostatic pressing, high pressure sintering, hydrostatic extrusion and pulse plasma sintering techniques. A detailed characterization of the phase aggregate, microstructure and micro-composition of the oxide scale was carried out by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy, respectively. Oxidation kinetics appear to follow a parabolic rate with an activation energy of 135 to 234 kJ/mol, which depend on alloy composition (i.e., Cr content). Oxidation mostly occurred by counter-ionic diffusion of oxygen from air to the interior and cations (Cr(+3)or Fe+3) from the bulk toward the surface. Alloy D sintered by hot isostatic pressing offered the highest resistance to oxidation.
引用
收藏
页码：5257 / 5267
页数：11
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