采用热模拟技术、力学性能测试技术和金相分析技术研究了中间坯快冷技术对Q345A厚板表层组织和性能的影响。结果表明：经过中间坯冷却＋回温轧制后,在距钢板表层2mm内获得细化的铁素体组织,晶粒平均直径在1μm左右,弥散分布着少量珠光体。基体组织和常规TMCP轧制态相似,是块状铁素体与珠光体整合组织。中间坯快冷技术不会降低钢板基体的力学性能和低温韧性,钢板表层的硬度略高于心部。与常规的TMCP工艺相比,钢板具有良好的止裂能力。
The effects of intermediate billet cooling on surface microstructure and property of Q345A steel heavy plate were investigated by the methods of thermal and numerical simulation,mechanical property testing and metallographic examination.The results show that the ultrafine ferrite microstructure with average grain size of 1 μm can be obtained on 2 mm surface layer while a little pearlite phase disperses in it.The matrix microstructure consists of massive ferrite and pearlite which is similar to that of the sample manufactured by the conventional TMCP.The matrix mechanical property,low temperature toughness will not be decreased by intermediate billet cooling.And the hardness on surface is a little more center of steel.Compared new TMCP（with intermediate billet cooling） with conventional TMCP,the steel has excellent crack arrest property.
参考文献
| [1] | 王国栋 .高附加值中厚板生产工艺、设备和技术[J].轧钢,2007,24(09):1. |
| [2] | 赵四新,姚连登,赵小婷.表层超细晶厚钢板的研制[J].世界钢铁,2009(05):18-22. |
| [3] | 赵河山,李殿中,刘朝霞,李依依.低碳钢形变诱导铁素体相中碳原子的扩散与稳定性研究[J].金属学报,2007(03):286-290. |
| [4] | 于在松,范长信,刘江南,王弘喆,王正品,石崇哲.示波冲击试验中裂纹生长与扩展机理研究[J].铸造技术,2008(05):617-621. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%