scholarly journals Effect of Cold Rolling on Recrystallization Behavior of Al-Free and Al-Added 15Cr-ODS Ferritic Steels

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 145 ◽  
Author(s):  
Yoosung Ha ◽  
Akihiko Kimura
Keyword(s):  
Cold Rolling ◽  
Grain Orientation ◽  
Rolling Direction ◽  
Oxide Particle ◽  
Particle Dispersion ◽  
Recrystallization Temperature ◽  
Ferritic Steels ◽  
Recrystallization Behavior ◽  
Ods Steel ◽  
Oxide Particles

The effect of cold rolling on the recrystallization behavior of Al-free and Al-added 15Cr-oxide dispersion strengthened (ODS) ferritic steels was investigated. The recrystallization of both steels are enhanced by cold rolling. The Al-free ODS steel with finer oxide particles is harder to recrystallize than Al-added ODS steel with coarser oxide particles. The effect of Al addition on the recrystallization behavior is evident. It is estimated that the recrystallization temperature of Al-free and Al-added 15Cr-ODS ferritic steel is 900 °C and 1250 °C with the annealing period of 1 h. In Al-free ODS steel, a small hardening was observed in the temperature range between 850 °C and 1200 °C, while no such phenomenon was observed in Al-added ODS steel, which is indicative of retardation of recovery by finely dispersed oxide particles. Oxide particle growth is mostly dependent on annealing temperature, while recrystallization and grain growth are controlled by not only the temperature, but the cold rolling ratio, which alters the multiple factors such as dislocation density, initial grain shape and oxide particle dispersion morphology. The cold rolling direction also influences the grain morphology and grain orientation in Al-added ODS steel, and the second rolling in a perpendicular direction to the first cold rolling direction induces the rotation of the grains from <110> to <112>. The recrystallization temperature is not significantly changed by the cold rolling direction. Recrystallization after cold rolling appears to increase the {111} grain orientation on the cold rolled specimen surface.

Effect of Improved ThO2 Particle Dispersion in Nickel on High-Temperature Strength

1970 ◽  
Vol 28 ◽  
pp. 444-445
Author(s):  
E. R. Kimmel ◽  
H. L. Anthony ◽  
W. Scheithauer
Keyword(s):  
High Temperature ◽  
Metal Matrix ◽  
Oxide Particle ◽  
Oxide Phase ◽  
Dislocation Motion ◽  
Particle Dispersion ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Oxide Particles ◽  
The Stability

The strengthening effect at high temperature produced by a dispersed oxide phase in a metal matrix is seemingly dependent on at least two major contributors: oxide particle size and spatial distribution, and stability of the worked microstructure. These two are strongly interrelated. The stability of the microstructure is produced by polygonization of the worked structure forming low angle cell boundaries which become anchored by the dispersed oxide particles. The effect of the particles on strength is therefore twofold, in that they stabilize the worked microstructure and also hinder dislocation motion during loading.

Atom probe tomography analysis of Ti-Y-O clustering during processing of nanoscale oxide particles in 14%Cr ODS ferritic steels

2011 ◽  
Vol 1298 ◽  
Author(s):  
Ceri A. Williams ◽  
Paulina Unifantowicz ◽  
Zbigniew Oksiuta ◽  
Nadine Baluc ◽  
George D. W. Smith ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Ferritic Steels ◽  
Ods Steel ◽  
Atom Probe Tomography Analysis ◽  
Oxide Particles ◽  
Tomography Analysis

ABSTRACTAtom probe tomography is used to investigate the clustering of Y-Ti-O in a 14%Cr-2%W-0.3%Ti & 0.3% Y2O3 ODS steel. The clusters in the consolidated material are compared to clusters observed in the powder prior to consolidation. A higher density of smaller clusters is observed in the powder, and the clusters are found to contain more O and less Y.

Combined Effect of Cold-Rolling and Aging on Precipitation and Recrystallization Behavior of Al-Er-Zr Alloy

2016 ◽  
Vol 877 ◽  
pp. 310-314
Author(s):  
Tong Hui Liu ◽  
Sheng Ping Wen ◽  
Xiao Lan Wu ◽  
Kun Yuan Gao ◽  
Hui Huang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Cold Rolling ◽  
Strong Interaction ◽  
Recrystallization Temperature ◽  
Precipitation Process ◽  
Recrystallization Behavior ◽  
Hardness Curve ◽  
Peak Aging ◽  
Cold Rolled ◽  
Zr Alloy

To investigate the effect of cold-rolling and aging on precipitation and recrystallization behavior of Al-0.04Er-0.08Zr (at. %) alloy, two thermo-mechanical processes containing peak aging + cold-rolling (A+CR) and cold-rolling + isochronal aging (CR+A) were studied. In A+CR process, the hardness of alloy under cold-rolled state was much higher than the maximum obtained during isochronal aging, due to the strong interaction between precipitates and dislocations or sub-grain boundaries. Furthermore, the recrystallization temperature was 475 °C as indicated by the hardness curve. The microstructure analysis revealed that the sample annealed at 525 °C for 1 h still don’t recrystallize fully. For CR+A, it turned out that the deformation play a small role in improving the maximum of hardness. But comparing with those without deformation, the existence of deformation accelerated the rate of precipitation process and obtained higher electrical conductivity.

scholarly journals Phase, Composition and Structure Changes of CoCrNi-Based Concentrated Alloys Resulting from High Temperature Oxidation

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2276
Author(s):  
Monika Vilémová ◽  
Hynek Hadraba ◽  
Zdeněk Weiss ◽  
František Lukáč ◽  
Štefan Csáki ◽  
...  
Keyword(s):  
Oxide Particle ◽  
Particle Dispersion ◽  
Alternative Mechanism ◽  
Oxide Scales ◽  
Protective Oxide ◽  
Temperature Oxidation ◽  
Cr2o3 Scale ◽  
Structure Changes ◽  
Plasma Sintering ◽  
Oxide Particles

In this work, CoCrNi, FeCoCrNi and CoCrFeMnNi concentrated alloys with a Y-Ti oxide particle dispersion were prepared by mechanical alloying and Spark Plasma Sintering. The alloy consists of an FCC Ni-based matrix with a Y-Ti oxide dispersion and additional phases of Cr23C6 and Cr2O3. The effect of Fe, Mn, and Y-Ti oxide particles on the formation of oxide scales and the composition of the adjacent CoCrNi and FeCoCrNi alloys was studied. It was found that alloys without Mn in their composition form a protective Cr2O3 scale. The Cr23C6 particles provide an alternative mechanism for balancing the chromium loss during the oxidation. Y and Ti from the oxide particles participate in the formation of the protective oxide scales. Fe promotes Y and especially Ti diffusion through the Cr2O3 scale, resulting in the formation of Ti-depleted regions in the alloy. The findings will serve for the further development of these new materials.

scholarly journals Effect of Nano-Size Oxide Particle Dispersion and δ-Ferrite Proportion on Creep Strength of 9Cr-ODS Steel

2009 ◽  
Vol 50 (7) ◽  
pp. 1778-1784 ◽  
Author(s):  
Satoshi Ohtsuka ◽  
Takeji Kaito ◽  
Sawoong Kim ◽  
Masaki Inoue ◽  
Tai Asayama ◽  
...  
Keyword(s):  
Creep Strength ◽  
Oxide Particle ◽  
Particle Dispersion ◽  
Delta Ferrite ◽  
Ods Steel ◽  
Nano Size

scholarly journals Anneal hardening effect in sintered copper alloys

2002 ◽  
Vol 34 (2) ◽  
pp. 169-174 ◽  
Author(s):  
Svetlana Nestorovic ◽  
Boran Milicevic ◽  
Desimir Markovic
Keyword(s):  
Electrical Conductivity ◽  
Cold Rolling ◽  
Copper Alloys ◽  
Recrystallization Temperature ◽  
Temperature Range ◽  
Hardening Effect ◽  
Sintered Copper ◽  
Anneal Hardening ◽  
Cold Rolled

Samples of copper and copper alloys CuNi and CuNiAl were prepared by a powder metallurgical method and were then subjected to cold rolling with different degrees of deformation. Copper and copper alloys in the cold-rolled state were isochronally annealed up to the recrystallization temperature during which hardness and electrical conductivity were measured. This investigation shows that the anneal hardening effect occurs in a temperature range of 450 - 650 K, followed with an increase in hardness of alloys.

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