In situ and glancing angle X-ray diffraction of the structure change during and after the high temperature oxidation at 1000 ○C in air of an yttrium-implanted 304 steel

The present study focuses on the high temperature oxidation of a AISI 304 chromiaforming nitrided alloy. Isothermal oxidations were performed in air, at 800°C. The effect of nitridation on the steel surface depends on the temperature of the treatment. It leads whether to a γN solid solution formation or to CrN formation. In situ X-ray diffraction has been used to follow the oxides formation. Results show the concomitant growth of CrN and Fe2O3 at the beginning of the test. Then, Cr2O3 quickly appears which leads to the formation of a protective oxide scale (a parabolic rate law is observed). Our conclusions suggest that nitridation increases the high temperature oxidation resistance of 304 steels at 800°C.

Download Full-text

In Situ Study of the High Temperature Oxidation of X20CrMoV 12 1 in Air by means of X-Ray Diffraction

Materials Science Forum ◽

10.4028/www.scientific.net/msf.166-169.361 ◽

1994 ◽

Vol 166-169 ◽

pp. 361-366 ◽

Cited By ~ 1

Author(s):

Maria Juez-Lorenzo ◽

Vladislav Kolarik ◽

N. Eisenreich ◽

W. Engel ◽

A.J. Criado

Keyword(s):

High Temperature ◽

High Temperature Oxidation ◽

X Ray Diffraction ◽

Temperature Oxidation ◽

X Ray ◽

In Situ Study

Download Full-text

High Temperature Oxidation of Fe-Al Alloys Stuedied by In Situ X-Ray Diffraction

Materials Science Forum ◽

10.4028/www.scientific.net/msf.251-254.251 ◽

1997 ◽

Vol 251-254 ◽

pp. 251-258 ◽

Cited By ~ 11

Author(s):

Vladislav Kolarik ◽

H. Fietzek ◽

W. Engel ◽

B. Eltester ◽

Hans Jürgen Grabke

Keyword(s):

High Temperature ◽

High Temperature Oxidation ◽

Al Alloys ◽

X Ray Diffraction ◽

Temperature Oxidation ◽

X Ray

Download Full-text

An Advanced Technique for High Temperature X-Ray Elastic Constant and Stress Investigations

Advances in X-ray Analysis ◽

10.1154/s0376030800019030 ◽

1992 ◽

Vol 36 ◽

pp. 411-422

Author(s):

Chun Liu ◽

Jean-Lou Lebrun ◽

François Sibieude

Keyword(s):

High Temperature ◽

Elastic Constant ◽

High Temperature Oxidation ◽

Differential Method ◽

Stress Evolution ◽

Advanced Technique ◽

Temperature Oxidation ◽

X Ray ◽

Refractory Alloys

AbstractA high temperature in situ X-Tay diffraction (HTXRD) instrument was devised for residual stress (RS) and X-ray elastic constant (XECs) investigations. The aim was to gain a better understanding of the stresses developed during high temperature oxidation, which is essential for the lifetime improvement of refractory alloys. The investigators use sin2ψ method to survey the stress evolution during oxidation in both the scale and the substrate, and differential method to determine the XECs that relate the measured/measurable deformation to the stress state of the materials studied. The stresses on the Ni/NiO system are measured in situ. The XECs are determined on XC75 steel samples. This paper presents the theories of stresses and XECs determined by HTXRD and briefly discusses the experimental results.

Download Full-text

Performance of Fe-33Ni-18Cr Alloy at High Temperature Oxidation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1010.65 ◽

2020 ◽

Vol 1010 ◽

pp. 65-70

Author(s):

Zahraa Zulnuraini ◽

Noraziana Parimin

Keyword(s):

Weight Gain ◽

High Temperature ◽

Oxide Scale ◽

High Temperature Oxidation ◽

Thick Layer ◽

X Ray Diffraction ◽

Temperature Oxidation ◽

X Ray ◽

Oxide Particles ◽

Lower Temperature

This paper investigates the performance of Fe-33Ni-18Cr alloy at high temperature oxidation. The samples were isothermally oxidized at three different oxidation temperatures, namely, 600 °C, 800 °C and 1000 °C for 150 hours. This alloy was ground by using several grits of SiC paper as well as weighed by using analytical balance and measured by using Vernier caliper before oxidation test. The characterization was carried out using scanning electron microscope (SEM) equipped with energy dispersive x-ray (EDX) and x-ray diffraction (XRD). The results show that, the higher oxidation temperatures, the weight gain of the samples were increase. Sample of 1000 °C indicate more weight gain compared to samples oxidized at 600 °C and 800 °C. The kinetic of oxidation of all samples followed the parabolic rate law. The surface morphology of oxide scale at lower temperature is thin and form a continuous layer, while at high temperature, the oxide scale develops thick layer with angular oxide particles.

Download Full-text

Microstructural Evolution during High-Temperature Oxidation of Ti2AlN Ceramics

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.65.106 ◽

2010 ◽

Vol 65 ◽

pp. 106-111

Author(s):

Bai Cui ◽

Rafael Sa ◽

Daniel Doni Jayaseelan ◽

Fawad Inam ◽

Michael J. Reece ◽

...

Keyword(s):

High Temperature ◽

Microstructural Evolution ◽

High Temperature Oxidation ◽

Oxidation Mechanism ◽

X Ray Diffraction ◽

Temperature Oxidation ◽

X Ray ◽

Oxidation In Air ◽

Α Al2o3 ◽

Increasing Temperature

Microstructural evolution of Ti2AlN ceramics during high-temperature oxidation in air has been revealed by X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEGSEM), and energy-dispersive spectroscopy (EDS). After oxidation below 1200 °C, layered microstructures formed on Ti2AlN surfaces containing anatase, rutile, and α-Al2O3. Above 1200 °C, more complex layered microstructures formed containing Al2TiO5, rutile, α-Al2O3, and continuous void layers. With increasing temperature, anatase gradually transformed to rutile, and TiO2 reacted with α-Al2O3 to form Al2TiO5. Based on these microstructural observations, an oxidation mechanism for Ti2AlN ceramics is proposed.

Download Full-text