| 引用本文: | 董毅,韩斌,时晓光,张宇,孙成钱.Si和Nb对高强热轧高扩孔钢组织和性能的影响[J].材料科学与工艺,2016,24(2):53-57.DOI:10.11951/j.issn.1005-0299.20160206. |
| DONG Yi,HAN Bin,SHI Xiaoguang,ZHANG Yu,SUN Chengqian.Effects of Si and Nb on the microstructure and properties of high strength hot-rolled steel with high hole expansion ratio[J].Materials Science and Technology,2016,24(2):53-57.DOI:10.11951/j.issn.1005-0299.20160206. |
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| 摘要: |
| 为了研究Si和Nb对高强热轧高扩孔钢板显微组织、力学性能和扩孔性能的影响，在CSP连轧线上进行了3种成分试验钢的热轧试制，并对试验钢在扩孔过程中裂纹的形成和扩展行为进行了分析.研究表明：3种成分热轧钢板的显微组织均由铁素体和贝氏体组成，钢板的抗拉强度均高于610 MPa，伸长率大于24.5%，扩孔率高于104%；Si含量的增加，提高了组织中铁素体的含量，钢板的强度、伸长率和扩孔率得到提高；Nb含量的增加，细化了钢板的组织，钢板的强度和扩孔率增加明显，伸长率变化不大；试验钢在扩孔过程中裂纹主要沿铁素体和贝氏体的晶界处扩展，部分裂纹穿过铁素体晶粒.
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| 关键词: 铁素体与贝氏体 扩孔性能 合金元素 组织和性能 冷却工艺 析出物 |
| DOI：10.11951/j.issn.1005-0299.20160206 |
| 分类号:TG142.1 |
| 文献标识码:A |
| 基金项目: |
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| Effects of Si and Nb on the microstructure and properties of high strength hot-rolled steel with high hole expansion ratio |
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DONG Yi, HAN Bin, SHI Xiaoguang, ZHANG Yu, SUN Chengqian
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(Technology Centre, Angang Steel Co. Ltd,Anshan 114001, China)
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| Abstract: |
| The hot-rolled test of the three tested steels with different chemical composition had been done on the CSP rolling line for studying the effects of Si and Nb on the microstructure, mechanical properties and stretch-flangeability of hot rolled high hole-expansion steel. The crack formation and propagation behavior of the tested steels was analyzed. The results showed that the three-component hot-rolled steels were composed of ferrite and bainite. The tensile strength of the steels was higher than 610 MPa, elongation was more than 24.5%, and the hole expansion ratio was higher than 104%. With the increase of Si, the volume fraction of ferrite increased, the strength, elongation and hole expansion ratio of the steels were improved. With the increase of Nb, the microstructure of the steel was refined, the strength and the hole expansion ratio increased significantly, and the elongation changed slightly. Cracks mainly propagated along the grain boundary of ferrite and bainite, but some cracks propagated through the ferrite grain.
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| Key words: ferrite and bainite stretch-flangeability alloying element microstructure and properies cooling process precipitation |
