Deformation and cracking behavior of protective oxide scales on heat-resistant steels under tensile strain

1985 ◽  
Vol 24 (3-4) ◽  
pp. 199-232 ◽  
Author(s):  
M. Sch�tze
Keyword(s):  
Tensile Strain ◽  
Oxide Scales ◽  
Protective Oxide ◽  
Cracking Behavior ◽  
Heat Resistant ◽  
Heat Resistant Steels

scholarly journals Steam Oxidation of Austenitic Heat-Resistant Steels TP347H and TP347HFG at 650–800 °C

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 577 ◽  
Author(s):  
Zhiyuan Liang ◽  
Qinxin Zhao
Keyword(s):  
Oxide Scale ◽  
Steam Oxidation ◽  
Oxidation Products ◽  
Oxide Scales ◽  
Metallic Ions ◽  
Breakaway Oxidation ◽  
Outward Diffusion ◽  
X Ray ◽  
Heat Resistant ◽  
Heat Resistant Steels

Steam oxidation of austenitic heat-resistant steels TP347H and TP347HFG at 650–800 °C was investigated. Comprehensive micro-characterization technologies containing Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray Diffraction (XRD), and X-ray Photoelectron Spectroscopy (XPS) were employed to observe and analyze the oxidation products. Results show that breakaway oxidation behaviors were observed on TP347H at 700 °C and 800 °C. The oxidation kinetics of TP347HFG at 650–800 °C followed a parabolic law. The oxide scales formed on TP347HFG were composed of MnCr2O4 and Cr2O3. A thin and protective Cr-rich oxide scale was replaced by Fe2O3 nodules due to the insufficient outward migration of metallic ions, including Cr and Mn at the subsurface of coarse-grain TP347H. Smaller grain of TP347HFG promoted the formation of the compact Cr-rich oxide scales. At higher temperatures, the incubation period for breakaway oxidation of the Cr-rich oxide scale was much shorter because of quick evaporation of the Cr2O3 oxide scale and the slower outward diffusion of metallic ions via the grain boundaries.

scholarly journals Z-phase Formation during Creep and Aging in 9–12% Cr Heat Resistant Steels

2006 ◽  
Vol 46 (5) ◽  
pp. 769-775 ◽  
Author(s):  
Kota Sawada ◽  
Hideaki Kushima ◽  
Kazuhiro Kimura
Keyword(s):  
Phase Formation ◽  
Heat Resistant ◽  
Heat Resistant Steels

scholarly journals Exploring the Effect of Silicon on the High Temperature Corrosion of Lean FeCrAl Alloys in Humid Air

2021 ◽  
Author(s):  
T. Sand ◽  
A. Edgren ◽  
C. Geers ◽  
V. Asokan ◽  
J. Eklund ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Oxidation Behavior ◽  
High Temperature Corrosion ◽  
The Other ◽  
Oxide Scales ◽  
Protective Oxide ◽  
New Approach ◽  
Fecral Alloys ◽  
Cr Evaporation

AbstractA new approach to reduce the chromium and aluminium concentrations in FeCrAl alloys without significantly impairing corrosion resistance is to alloy with 1–2 wt.% silicon. This paper investigates the “silicon effect” on oxidation by comparing the oxidation behavior and scale microstructure of two FeCrAl alloys, one alloyed with silicon and the other not, in dry and wet air at 600 °C and 800 °C. Both alloys formed thin protective oxide scales and the Cr-evaporation rates were small. In wet air at 800 °C the Si-alloyed FeCrAl formed an oxide scale containing mullite and tridymite together with α- and γ-alumina. It is suggested that the reported improvement of the corrosion resistance of Al- and Cr-lean FeCrAl’s by silicon alloying is caused by the appearance of Si-rich phases in the scale.

Thermodynamic Interactions in Hot Isostatic Pressed Graded Structures of Dissimilar Heat Resistant Steels

1995 ◽  
Vol 86 (12) ◽  
pp. 864-869
Author(s):  
Rainer Prader ◽  
Bruno Buchmayr ◽  
Horst Cerjak ◽  
Alexander Fleming ◽  
Jürgen Peterseim
Keyword(s):  
Heat Resistant ◽  
Heat Resistant Steels ◽  
Graded Structures

scholarly journals Steam Oxidation of Ferritic Heat-resistant Steels for Ultra Supercritical Boilers

2001 ◽  
Vol 50 (2) ◽  
pp. 50-56 ◽  
Author(s):  
Yutaka Watanabe ◽  
Yongsun Yi ◽  
Tatsuo Kondo ◽  
Koshi Suzuki ◽  
Kimio Kano
Keyword(s):  
Steam Oxidation ◽  
Heat Resistant ◽  
Heat Resistant Steels

Damage Analysis of Heat Resistant Steels

2007 ◽  
Vol 537-538 ◽  
pp. 303-306
Author(s):  
Tamás Bíró ◽  
László Dévényi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Microscopy ◽  
Damage Analysis ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Advantages And Disadvantages ◽  
Heat Resistant ◽  
Heat Resistant Steels ◽  
Scanning Electron

This paper shows the result of some metallographical examinations that have been carried out on low-alloyed Cr-Mo-V heat resistant steel. The aim of this research is to present and compare the advantages and disadvantages of the mainly applied metallographical methods. These techniques are optical microscopy, scanning electron microscopy, replica method and special applications of these methods. We have proved that using the investigated methods together gives much more information about the lifetime of the specimen than using these techniques particularly.

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