Paper Title:
Annealing of Fe-15at.%Cr Alloy in N2-H2 Gas Mixtures: Effect of Hydrogen
  Abstract

The effect of hydrogen during annealing of Fe-15.at%Cr alloy on the diffusion profile was investigated concerning the enrichment of chromium and the selective oxidation. Samples were exposed to an annealing gas mixture with different hydrogen contents in an infrared heating furnace and heated to 800oC, kept for 60 seconds and then cooled down to room temperature. After the experiments, field emission scanning electron microscopy (FE-SEM) equipped with electron back-scattering diffraction (EBSD) and x-ray photoelectron spectroscopy (XPS) were employed to characterize the morphology, elemental depth profiles and the chemical states of the elements. The annealing increased the Cr content at the surface in all atmospheres. The increase of hydrogen content in the atmosphere further increased the Cr to Fe ratio in near-surface, and the thickness of the layer affected by the heat treatment. The selective oxidation of chromium occurred as internal Cr2O3 formation, as a function of the Cr content, rather than the oxygen partial pressure. Hydrogen facilitated the diffusion of chromium probably by cleaning of fast diffusion paths.

  Info
Periodical
Defect and Diffusion Forum (Volumes 237-240)
Edited by
M. Danielewski, R. Filipek, R. Kozubski, W. Kucza, P. Zieba, Z. Zurek
Pages
928-933
DOI
10.4028/www.scientific.net/DDF.237-240.928
Citation
E. Park, B. Hüning, H. J. Grabke, M. Spiegel, "Annealing of Fe-15at.%Cr Alloy in N2-H2 Gas Mixtures: Effect of Hydrogen", Defect and Diffusion Forum, Vols. 237-240, pp. 928-933, 2005
Online since
April 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: I. Foroutan, Arash Rezaei, Ali Shokuhfar
Abstract:Surface alloying is a new method of surface treatment by which an element is diffused into the surface of another element causing the...
531
Authors: Guo Dong Hao, Yong Liang Guo, Gang Liu, Xin Mei Zhang
Abstract:Nanostructured surface layer was produced on Ti-6Al-4V alloy by surface mechanical attrition treatment (SMAT) technique, and the composite...
67
Authors: Wan Chang Sun, He Jun Li, Qian Gang Fu, Shou Yang Zhang
Abstract:PAN-carbon fibers were pretreated using three methods. 2D-C/C composites were fabricated by a rapid chemical liquid-vaporized infiltration...
482
Authors: Sheng Zhu, Guo Feng Han, Xiao Ming Wang, Wen Bo Du
Chapter 1: Composites
Abstract:In this study, Al-Si alloy protective coating was deposited on the surface of ZM5 magnesium alloy by cold spray technology. Researchers...
142
Authors: Massimo Camarda, Andrea Canino, Patrick Fiorenza, Corrado Bongiorno, Andrea Severino, Vito Raineri, Antonino La Magna, Francesco La Via, Marco Mauceri, Giuseppe Abbondanza, Antonino Pecora, Danilo Crippa
Chapter 2: SiC Epitaxial Growth
Abstract:In this paper we study the surface morphology of <11-20> 4° degree off, silicon terminated, 4H Silicon Carbide (4H-SiC) in terms of...
149