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| High Strength and Toughness Mechanism of Ultra-low Carbon Bainitic Steel Containing Cu in Mn-Nb-B Micro-alloy |
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| DOI：DOI：10.3969/j.issn.1007-7545.2011.07.009 |
| KeyWord:metal material; ultra low carbon bainitic steel; lath bainite; fine-grained strengthening; precipitation strengthening |
| Author | Institution |
| CHENG Jiu-shan |
武汉科技大学 材料与冶金学院，武汉 |
| LIU Jing |
武汉科技大学 材料与冶金学院，武汉 |
| ZHEN Fan |
武汉科技大学 材料与冶金学院，武汉 |
| XU Jin-qiao |
武汉钢铁集团公司研究院，武汉 |
| GUO Bin |
武汉钢铁集团公司研究院，武汉 |
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| Abstract: |
| Ultra low carbon bainite steel with yield strength up to 850MPa is gained through TMCP treatment on the copper-containing Mn-Nb-B micro-alloyed steel. The microstructures with different distances from the face are investigated by means of the optical microscope and scanning electron microscope (SEM). The precipitates in the lath bainite are described through the transmission electron microscopy (TEM). The results show that the microstructure of the ULCB steel with yield strength up to 850MPa is mainly composed of fine lath bainite. Along the thickness of the steel plate, the width of the lath bainite does not present obvious change, but the length increases from the surface to the center. The lath bainitic microstructure refinement and fine precipitates play a decisive role in the experimental steel. |
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