Mechanical Alloying and Properties of ODS Ferritic Steels

2006 ◽  
Vol 15-17 ◽  
pp. 696-701 ◽  
Author(s):  
Jung Ho Ahn ◽  
Sang Hyun Lee ◽  
Jin Sung Jang
Keyword(s):  
High Temperature ◽  
Mechanical Alloying ◽  
Stainless Steels ◽  
Oxide Dispersion Strengthened ◽  
Processing Parameters ◽  
Ferritic Steels ◽  
Mechanically Alloyed ◽  
Ferritic Stainless Steels ◽  
High Temperature Materials ◽  
The Stability

Oxide-dispersion strengthened (ODS) ferritic stainless steels have been considered as promising high-temperature materials such as interconnects for oxide-fuel cells and nuclear materials for Liquid Metal Fast Reactors or Super-Critical-Water-Cooled Reactors. In the present work, we have prepared Fe-14Cr-2Al-1Si-0.3Ta-1Y2O3 ferritic stainless steels which were dispersion-strengthened by nano-sized Y2O3 via mechanical alloying of elemental powder mixtures and subsequent hot consolidation. A comparison was made with MA 957 and DY-01 alloys. The mechanically alloying behaviour and consolidated mechanical properties of the Fe-14Cr-2Al-1Si- 0.3Ta-1Y2O3 ferritic steels were strongly influenced by processing parameters, especially milling atmosphere. The stability of yttrium oxides and oxidation resistance at high temperatures were examined. The preliminary result shows that the mechanically alloyed Fe-14Cr-2Al-1Si-0.3Ta- 1Y2O3 ferritic stainless steel exhibits interesting properties to be exploited as high temperature materials.

High temperature behavior of the metal/oxide interface of ferritic stainless steels

2012 ◽  
Vol 59 ◽  
pp. 148-156 ◽  
Author(s):  
Jérôme Issartel ◽  
Sébastien Martoia ◽  
Frédéric Charlot ◽  
Valérie Parry ◽  
Guillaume Parry ◽  
...  
Keyword(s):  
High Temperature ◽  
Metal Oxide ◽  
Stainless Steels ◽  
Temperature Behavior ◽  
Oxide Interface ◽  
Ferritic Stainless Steels ◽  
High Temperature Behavior

A study of high temperature cracking in ferritic stainless steels

1992 ◽  
Vol 158 (1) ◽  
pp. 21-30 ◽  
Author(s):  
Siu Wah Wai ◽  
M.B. Cortie ◽  
F.P.A. Robinson
Keyword(s):  
High Temperature ◽  
Stainless Steels ◽  
Ferritic Stainless Steels

Influence of the Processing Parameters on the Nature of Oxides Formed on Sintered Stainless Steels during High-Temperature Exposures

2009 ◽  
Vol 289-292 ◽  
pp. 485-492
Author(s):  
Asuncion Bautista ◽  
Cristina Moral ◽  
Francisco Velasco
Keyword(s):  
High Temperature ◽  
Stainless Steels ◽  
Processing Parameters ◽  
X Ray Diffraction ◽  
Cross Sectional ◽  
Pressing Method ◽  
Sintering Atmosphere ◽  
Partial Pressures ◽  
Oxidation Mechanisms ◽  
Oxidative Attack

Powder metallurgical (PM) stainless steels can be used for high-temperature applications. However, their characteristic porosity dramatically affects the resistance of the stainless steels to the oxidative attack and modifies the oxidation mechanisms. In this work, it is discussed how the processing parameters of PM stainless steels can modify the diffusion process when the material is exposed at high-temperature in oxidative environments. Processing parameters affect not only the amount but also the nature of the formed oxides. For powders of a given composition, the pressing method, the sintering atmosphere (vacuum, 100% H2 or 75%H2/25%N2) and the sintering temperature can modify the amount of porosity and its shape, often promoting the formation of less-protective oxides, instead of chromia. The different oxygen partial pressures in the inner pores and on the outer surface of the material also tend to make oxides formed inside the stainless steel pores more protective than those formed on their surface. X-ray diffraction, SEM and EDS studies of surface and cross-sectional views of the oxidized materials are used to prove these differences.

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