CSP生产的钒氮微合金钢的组织细化和析出物研究

钢铁, 2009, 44(4): 64-0.

CSP生产的钒氮微合金钢的组织细化和析出物研究

1.1.江苏大学材料科学与工程学院，江苏镇江 212013；2.广州钢铁企业集团CSP应用技术研究所，广东广州 510730

1.1.School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

2. 2.CSP Applying Technology Research Institute, Guangzhou Iron and Steel Enterprise Group， Guangzhou 510730， Guangdong, China

关键词：微合金钢;铁素体;超细晶组织;碳氮化钒;沉淀强化

Study of Grain Refinement and Precipitation in VN Steels Produced by CSP Process

HUO Xiangdong , MAO Xinping , ZHENG Xiaowei , LIN Zhenyuan , WANG Zhiyuan

Keywords： microalloyed steel;ferrite;ultrafine microstructure;vanadium carbides and nitrides;precipitation hardening

紧凑式带钢工艺（CSP）生产的钒氮微合金钢屈服强度超过600 MPa，韧性良好。采用扫描电镜和透射电镜观察发现，铁素体平均晶粒直径在3 μm左右，在铁素体晶粒内部分布着数十纳米和几纳米的两类V(C,N)析出物。细晶强化是主要的强化方式，在铁素体中析出的V(C,N)粒子起到了沉淀强化作用。分析了超细晶组织形成的主要原因。

Using VN microalloying technology, strips whose yield strength is 600 MPa grade is produced by compact strip production (CSP) line. Scanning electron microscope and transmission electron microscope were used to study the microstructure and precipitation in VN steels. The ferrite grain size is about three microns. Tow types of V(C,N) particles with several tens nanometers or several nanometers are found. The main strengthening method is grain refinement, and V(C,N) particles play an important role of precipitation hardening. Base on the experimental results, the main reason for ultrafine microstructure was discussed.

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