采用Gleeble 1500热模拟试验机模拟了ER70S-6钢在高速线材生产中的精轧和冷却工艺,并根据模拟试验结果绘制了ER70S-6钢的动态CCT曲线图,优化了获得双相组织的精轧和冷却工艺。结果表明,在845℃变形后以大于10℃/s冷速冷却,ER70S-6钢可以获得含约11%马氏体的双相组织;冷速大于30℃/s时变形组织的晶粒尺寸较小,约4.2μm。变形后以大于30℃/s的冷速冷却,ER70S-6钢可以获得晶粒尺寸细小、马氏体含量稳定的双相组织。通过热模拟试验的指导,在高速线材轧机上成功生产出晶粒尺寸约8.2μm、马氏体含量约11.5%的双相组织盘条。
The finishing rolling and controlling cooling processes of ER70S-6 steel production in high-speed wire rolling mill were simulated by Gleeble 1500 simulator,then the dynamic CCT curves of the steel was plotted,and the finishing rolling and controlling cooling processes for obtaining dual phase microstructure were optimized.The results show that after deformation at the temperature of 845 ℃ and cooling at a rate of higher than 10 ℃/s ER70S-6 steel has a dual phase microstructure with about 11% martensite in volume fraction.After cooling at a rate of higher than 30 ℃/s the deformed microstructure has a finer grain size of about 4.2 μm.In general,after deformation and cooling at a rate of higher than 30 ℃/s,a dual phase microstructure with fine grain size and constant volume of martensite can be obtained for ER70S-6 steel.Guided by the thermal simulating experiments,the wire rod with a dual phase microstructure of 8.2 μm in grain size and 11.5% in martensitic volume fraction has been produced successfully in high-speed wire rolling mill.
参考文献
| [1] | 马鸣图;吴宝榕.双相钢--物理和力学冶金[M].北京:冶金工业出版社,2009 |
| [2] | 周艳.ML08Mn2Si双相钢在高强度螺栓中的应用[J].机械工程材料,2003(03):54-54. |
| [3] | 王宁,李毅,杜林秀,吴迪,刘相华.550MPa级低成本商用车车轮钢的工业试制及性能研究[J].钢铁,2008(06):74-77. |
| [4] | 胡克迈.Gleeble 3500热机械模拟试验系统及其数控热扭转单元[J].钢管,2008(02):41-46. |
| [5] | YB/T5127-1993.钢的临界点测定方法(膨胀法)[S].北京:中国标准出版社,1994. |
| [6] | F.L.G. Oliveira;M.S. Andrade;A.B. Cota .Kinetics of austenite formation during continuous heating in a low carbon steel[J].Materials Characterization,2007(3):256-261. |
| [7] | TED F. MAJKA;DAVID K. MATLOCK;GEORGE KRAUSS .Development of Microstructural Banding in Low-Alloy Steel with Simulated Mn Segregation[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2002(6):1627-1637. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%