Pressing vacuum sintering of multipowders for manufacturing novel engine valve seat on Gleeble 1500 simulator
| Autor: | Z. M. Yin, Y. Z. Zhu |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Pressing
Materials science Scanning electron microscope Alloy Metallurgy Metals and Alloys Sintering engineering.material Condensed Matter Physics Microstructure law.invention Optical microscope Mechanics of Materials law Vickers hardness test Materials Chemistry Ceramics and Composites engineering Simulation Shrinkage |
| Zdroj: | Powder Metallurgy. 52:42-48 |
| ISSN: | 1743-2901 0032-5899 |
| Popis: | Patented Fe based multipowders for manufacturing novel engine valve seat were compacted and sintered using a Gleeble 1500 thermal simulator system. Microstructures and properties of the sintered alloy have been studied by hardness test, optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD) analysis. Results indicate that a sintered alloy with a hardness of 38 HRC and a density of 7·23 g cm−3 can be obtained when the green compacts are sintered at 1240°C for 30 min. It is found that lattice parameters of the alloy matrix increase with increasing sintering temperature. Additionally, the investigation of green compacts' shrinkage during sintering shows that there is a threshold value for the density of the green compacts. When the density of the green compacts is lower than that value, the density of the sintered alloy remains almost constant with increasing density of green compacts. An equation to calculate the threshold dens... |
| Databáze: | OpenAIRE |
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