Effect of processing parameters on the evolution of dislocation density and sub-grain size of a 12%Cr heat resistant steel during creep at 650°C
▶ Dislocation density/subgrain size evolution in 12%Cr steel studied by HAADF-STEM. ▶ Correlation processing parameters/microstructure evolution/creep curves was studied. ▶ Hot-forged samples present higher dislocation density than non hot-forged samples. ▶ Crept samples showed increase of subgrain...
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Published in | Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 3; pp. 1372 - 1381 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Kidlington
Elsevier B.V
25.01.2011
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | ▶ Dislocation density/subgrain size evolution in 12%Cr steel studied by HAADF-STEM. ▶ Correlation processing parameters/microstructure evolution/creep curves was studied. ▶ Hot-forged samples present higher dislocation density than non hot-forged samples. ▶ Crept samples showed increase of subgrain size and reduction of dislocation density. ▶ Hot-forging enhances creep-strength due to better particle size and distribution.
The influence of hot-deformation and tempering temperature on the microstructure evolution of a 12%Cr heat resistant steel during short-term creep at 80–250MPa and 650°C was investigated. Quantitative determination of dislocation density and sub-grain size in the initial microstructure and after creep was investigated by STEM-HAADF. A correlation between microstructure evolution and creep response is established. All crept samples showed a significant increase of sub-grain size and a reduction of dislocation density. Hot-deformed samples showed better creep strength than non hot-deformed samples due to homogenization of the microstructure. The tempering temperature affected the dislocation density and the sub-grain size evolution, influencing the creep behavior. |
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ISSN: | 0921-5093 1873-4936 |
DOI: | 10.1016/j.msea.2010.10.028 |