轧后超快速冷却终冷温度对780 MPa级建筑用钢屈强比的影响
Effect of Final Temperature of Ultra Fast Cooling after Rolling on Yield Ratio of 780 MPa Constructional Steel
摘 要
利用实验室φ 450 mm二辊可逆式热轧机及超快速冷却设备研究了轧后超快速冷却终冷温度对780 MPa级高强度低屈强比建筑用钢显微组织及屈强比的影响。结果表明: 随着轧后终冷温度由630 ℃降低至360 ℃, 试验钢的强度和屈强比均呈上升趋势, 显微组织则由以贝氏体铁素体为软相基体、M/A岛为硬质弥散第二相的复相组织向板条贝氏体占主体的单一组织转变, 其屈强比由0.69升至0.94; 当终冷温度为550 ℃左右时, 其屈服强度和抗拉强度分别为650 MPa和955 MPa, 屈强比为0.68, 伸长率达到19.2%。
屈强比
超快速冷却
终冷温度
M/A岛
constructional steel
yield ratio
ultra fast cooling
final cooling temperature
M/A island
Abstract
The effect of final temperature of ultra fast cooling after rolling on microstructure and yield ratio was studied in laboratory by a φ 450 mm hot-rolling mill and an ultra fast cooling system. The results show that the strength and yield ratio of the tested steel increased when final cooling temperature varies from 630 ℃ to 360 ℃, and microstructure passed through the transformation of composite phases microstructure including bainite ferrite matrix and M/A island phase to the single lath bainite microstructure, and the yield ratio increased to 0.94 from 0.69. When final cooling temperature was about 550 ℃, the yield strength was 650 MPa, the tensile strength was 955 MPa, the yield ratio was 0.68, and the elongation was about 19.2%.
中图分类号 TG146.1
所属栏目
基金项目 中央高校基本科研业务费资助项目(N090607001); 国家科技支撑计划项目(2006BAE03A08)
收稿日期 2010/10/22
修改稿日期 2011/2/1
网络出版日期
作者单位点击查看
备注康健(1982-), 男, 辽宁沈阳人, 博士研究生。
引用该论文: KANG Jian,WANG Zhao-dong,YUAN Guo,WANG Guo-dong. Effect of Final Temperature of Ultra Fast Cooling after Rolling on Yield Ratio of 780 MPa Constructional Steel[J]. Materials for mechancial engineering, 2011, 35(11): 1～4
康健,王昭东,袁国,王国栋. 轧后超快速冷却终冷温度对780 MPa级建筑用钢屈强比的影响[J]. 机械工程材料, 2011, 35(11): 1～4
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【8】YANG D Z, SUN X W, LEI T C. Effect of intercritical quenching on microstructure and tensile properties of steels 15 and 15Mn2Nb[J]. Journal of Materials Science,1983,18(9):2727-2731.
【9】LI Z, WU D. Study of the high strength and low yield ratio cold forging steel[J]. Materials Science and Engineering A,2007,452/453:142-148.
【10】OUCHI C. Development of steel plates by intensive use of TMCP and direct quenching processes[J]. ISIJ International,2001,41(6):542-553.
【11】张丕军,刘相华,王国栋.800 MPa级双相组织低屈强比钢厚板研究[J].东北大学学报,2006,27(4):414-417.
【12】DEARDO A J. Multi-phase microstructures and their properties in high strength low carbon steels[J]. ISIJ International,1995,35(8):946-954.
【13】STEINBRUNNER D L, MATLOCK D K, KRAUSS G. Void formation during tensile testing of dual phase steels[J]. Metallurgical Transactions A,1988, 19:579-589.
【14】BRAMFITI B L, SPEER J G. A perspective on the morpho-logy of bainite[J]. Metallurgical Transactions A,1990,21:817-829.
【15】MARDER A R. Deformation characteristics of dual-phase steels[J]. Metallurgical Transactions A,1982,13:85-92.
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