Effect of Tungsten on Long-Term Microstructural Evolution and Impression Creep Behavior of 9Cr Reduced Activation Ferritic/Martensitic Steel
| Autor: | S. Saroja, V.D. Vijayanand, V. Thomas Paul, C. Sudha |
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| Rok vydání: | 2016 |
| Předmět: |
Structural material
Materials science Metallurgy Metals and Alloys chemistry.chemical_element 02 engineering and technology Tungsten Laves phase 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 020501 mining & metallurgy Carbide 0205 materials engineering chemistry Creep Mechanics of Materials Martensite Dislocation 0210 nano-technology |
| Zdroj: | Metallurgical and Materials Transactions A. 48:425-438 |
| ISSN: | 1543-1940 1073-5623 |
| Popis: | The present study describes the changes in the creep properties associated with microstructural evolution during thermal exposures to near service temperatures in indigenously developed reduced activation ferritic-martensitic steels with varying tungsten (1 and 1.4 wt pct W) contents. The creep behavior has been studied employing impression creep (IC) test, and the changes in impression creep behavior with tungsten content have been correlated with the observed microstructures. The results of IC test showed that an increase in 0.4 pct W decreases the creep rate to nearly half the value. Creep strength of 1.4 pct W steel showed an increase in steels aged for short durations which decreased as aging time increased. The microstructural changes include coarsening of precipitates, reduction in dislocation density, changes in microchemistry, and formation of new phases. The formation of various phases and their volume fractions have been predicted using the JMatPro software for the two steels and validated by experimental methods. Detailed transmission electron microscopy analysis shows coarsening of precipitates and formation of a discontinuous network of Laves phase in 1.4 W steel aged for 10,000 hours at 823 K (550 °C) which is in agreement with the JMatPro simulation results. |
| Databáze: | OpenAIRE |
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