Compression characteristics of 6Cr21Mn10MoVNbN heat resistant valve alloy at elevated temperatures
| Autor: | Y. Z. Zhu, Z. M. Yin |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Alloy Constitutive equation Metals and Alloys Strain rate engineering.material Microstructure Compression (physics) Stress (mechanics) Mechanics of Materials Materials Chemistry engineering Metallography Composite material Deformation (engineering) |
| Zdroj: | Ironmaking & Steelmaking. 35:56-62 |
| ISSN: | 1743-2812 0301-9233 |
| Popis: | 6Cr21Mn10MoVNbN is a new type of alloy used for heavy duty engines. Thermal simulation, metallography, X-ray diffraction and theoretical analysis have been used to study the deformation behaviour of the alloy at elevated temperatures. By introducing an internal variable parameter, a constitutive equation has been suggested for the dynamic calculation of the stress/strain curve for this alloy based on the Zerrilli–Armstrong equation used for fcc materials. The data calculated using the equation developed agree fairly well with the experimental data. The microstructure of the alloy is found to depend greatly on temperature and strain rate. When the alloy is deformed at 850°C, Cr23C6 precipitates from the matrix. The lower the strain rate, the more Cr23C6 precipitated from the matrix. At the same time, the amount of Cr23C6 decreases with increasing temperature. Between 850 and 1050°C, the amount of NbN in the alloy increases with increasing temperature and reaches a peak at 1050°C. NbN begins to dec... |
| Databáze: | OpenAIRE |
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