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Analysis of Microstructure Characteristics and Precipitation Behavior of Automobile Beam Steels Produced by Compact Strip Production |
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| Authors: | ZHAO Zheng-zhi LIU Jie ZHAO Ai-min |
| Affiliation: | 1. Metallurgical Engineering Research Institute,University of Science and Technology Beijing,Beijing 100083,China 2. Shougang Research Institute of Technology,Beijing 100041,China 3. Metallurgical Engineering Research Institute,University of Science and Technology Beijing,Beijing 100083,China;School of Materials Science and Engineering,University of Science and Technology Beijing, |
| Abstract: | The microstructure characteristics and precipitation behavior of automobile beam steels produced by compact strip production (CSP) were investigated by use of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray energy dispersive spectroscopy. The result shows that the final microstructure is mainly composed of polygonal ferrite and small amount of pearlite, and the average ferrite grain size is about 3-6 μm. Small amount addition Ti to aluminium-killed steel can help to refine the microstructure and improve the mechanical properties. A large number of fine precipitates have been observed in automobile beam steels. The mean particle size is about 10-30 nm. Remarkable strengthening and grain refinement can be obtained by these nano-particles. |
| Keywords: | compact strip production microstructure precipitation behavior |
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