Ultrastrong nanocrystalline oxide-dispersion-strengthened ferritic alloy with exceptional thermal stability

2021 ◽  
pp. 141616
Author(s):  
X.C. Cai ◽  
J.J. Liang ◽  
L.D. Xu ◽  
B.R. Sun ◽  
Z. Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Ferritic Alloy ◽  
Nanocrystalline Oxide

Microstructural Characterization of Friction Stir Welded Oxide Dispersion Strengthened 14YWT Ferritic Alloy and F82H Tempered Martensitic Steel

2012 ◽  
Vol 18 (S2) ◽  
pp. 1658-1659
Author(s):  
D.T. Hoelzer ◽  
K.A. Unocic ◽  
D.W. Coffey ◽  
Z. Feng
Keyword(s):  
Martensitic Steel ◽  
Microstructural Characterization ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Ferritic Alloy ◽  
Friction Stir

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

Mechanism of oxide particle evolution in the MA957 ODS ferritic alloy

2008 ◽  
Vol 1125 ◽  
Author(s):  
H. Sakasegawa ◽  
F. Legendre ◽  
L. Boulanger ◽  
L. Chaffron ◽  
T. Cozzika ◽  
...  
Keyword(s):  
High Temperatures ◽  
Oxide Particle ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Ferritic Alloy ◽  
Evolution Mechanism ◽  
Past Work ◽  
Yttrium Content ◽  
The Stability

ABSTRACTIn our past work, two types of nanometer-sized oxide particle were found in the commercial ODS (Oxide Dispersion Strengthened) ferritic alloy MA957. They were nonstoichiometric Y-, Ti-, O-enriched clusters (2 ∼ 15 nm) and stoichiometric Y2Ti2O7 (15 ∼ 35 nm). The particles which have an important role for the strengthening were confirmed to be nonstoichiometric Y-, Ti-, O-enriched clusters (denoted by YxTiyOz in this work). Based on that result, the stability and evolution mechanism of oxide particle at high temperatures were studied in this work. After annealing (1473 K × 1 h), most of the non-stoichiometric YxTiyOz particles were stable and their size increased very little. However, some these particles apparently became Y2Ti2O7 particles with increasing size and yttrium content. They possibly contributed to the growth of Y2Ti2O7.

Study of the thermal stability of nanoparticle distributions in an oxide dispersion strengthened (ODS) ferritic alloys

2012 ◽  
Vol 428 (1-3) ◽  
pp. 154-159 ◽  
Author(s):  
S.Y. Zhong ◽  
J. Ribis ◽  
V. Klosek ◽  
Y. de Carlan ◽  
N. Lochet ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Ferritic Alloys ◽  
Thermal Stability Of

Effect of Strain Heterogeneity on the Recrystallization Behavior of an Oxide Dispersion Strengthened Ferritic Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 3833-3838 ◽  
Author(s):  
Chun Liang Chen ◽  
G.J. Tatlock ◽  
Andy R. Jones
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Power Plants ◽  
Tensile Deformation ◽  
Shear Banding ◽  
Stress Gradient ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Recrystallization Behavior ◽  
Ferritic Alloy

Oxide Dispersion Strengthened (ODS) Fe-based alloys often contain 0.5wt% of fine, uniformly dispersed, yttrium oxide particles in a Fe-Cr-Al matrix. They are ideal candidates for high temperature applications such as high temperature heat exchangers or nuclear power plants due to their good combination of creep and oxidation resistance. Numerous studies of annealing phenomena have shown that nucleation and growth of recrystallized grains, as well as the recrystallization texture, strongly depend on the deformed state of a previously cold worked alloy. In the present work, we examined the effect of strain heterogeneity on the development of recrystallized grain structures using bend samples. A bend test introduces a stress gradient and both compressive and tensile deformation. After a further heat treatment at 1380°C for 1 hour in air, the recrystallization behavior was characterized on both the tension and compression sides of the samples at varied levels of strain. Electron backscattering diffraction (EBSD) was used to analyze recrystallization behavior and texture. The results demonstrated that: recrystallized grains only formed in areas of sample subject to plastic compression; maximum grain size increased with increasing severity of bending deformation; there was heterogeneity in the recrystallized grain size, which varied with distance from the bending neutral axis. This indicates that the strain heterogeneity conducive to recrystallization was introduced by the non-uniform plastic strains in the compression region. However, the regions of tensile bending in all samples remained unrecrystallized and strong shear banding was evident.

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