|
|
|
| Effects of TMCP Schedule on Precipitation, Microstructure and Properties of Ti-microalloyed High Strength Steel |
| Xiang-dong HUO1,Lie-jun LI2,Zheng-wu PENG2,Song-jun CHEN1 |
1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
2. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, Guangdong, China |
|
|
|
|
Abstract Using the similar compositions of the Ti-microalloyed high-strength steels produced by the thin-slab casting process of compact strip production (CSP), four thermo-mechanical control processes(TMCP) after the simulated thick-slab casting, i.e. the two hot rolling routes and the two cooling processes, were designed, aiming at achieving the same mechanical properties as the thin strip products. The final microstructures after the four TMCP processes were examined by optical microscope(OM), scanning electron microscope(SEM) and transmission electron microscope (TEM). The tensile properties and Charpy impact energy were measured correspondingly. Strain-induced TiC precipitation was found in the two-stage rolling route with the finish rolling temperature at low levels, leading to grain refinement due to the pinning effect during austenite recrystallization. Precipitation hardening in ferrite was observed when a period of isothermal holding was applied after hot rolling. It could be concluded that both finish rolling temperature and the subsequent isothermal holding temperature were crucial for the achieved strength level due to the combined effect of grain refinement and precipitation hardening. At the same time, it was found that the isothermal holding led to poor impact toughness because of remarkable precipitation hardening. Therefore, it was suggested that the precipitation kinetics of titanium carbides in both austenite and ferrite should be investigated in future.
|
|
Received: 10 June 2015
Published: 12 June 2016
|
|
Corresponding Authors:
Xiang-Dong HUO
E-mail: hxdustb@163.com
|
|
|
|
| [1] |
Yu Xu,,En-gang Wang,,*,Zhuang Li,,An-yuan Deng,. Effects of vertical electromagnetic stirring on grain refinement and macrosegregation control of bearing steel billet in continuous casting[J]. Chinese Journal of Iron and Steel, 2017, 24(5): 483-489. |
| [2] |
Qiang Yu,,Chao-fang Dong,*,Jian-xiong Liang,Zhen-bao Liu,Kui Xiao,Xiao-gang Li. Stress corrosion cracking behavior of PH13-8Mo stainless steel in Cl- solutions[J]. Chinese Journal of Iron and Steel, 2017, 24(3): 282-289. |
| [3] |
Zheng CHEN,,Qi��jie ZHAI,Jie��yu ZHANG,Hong��gang ZHONG. Effects of Thermal Gradients and Rotational Flows on Grain Growth in 22 t Steel Ingots[J]. Chinese Journal of Iron and Steel, 2016, 23(9): 973-980. |
| [4] |
Gen LIANG,,Chen SHI,,Ya-jun ZHOU,,Da-heng MAO,. Numerical Simulation and Experimental Study of an Ultrasonic Waveguide for Ultrasonic Casting of 35CrMo Steel[J]. Chinese Journal of Iron and Steel, 2016, 23(8): 772-777. |
| [5] |
Wei-jun HUI,Cheng-wei SHAO,Yong-jian ZHANG,Si-lian CHEN,Han DONG. Influence of Vanadium on Fracture Splitting Property of Medium Carbon Steel[J]. Chinese Journal of Iron and Steel, 2016, 23(5): 475-483. |
| [6] |
Jia-tao ZHANG,Yu-guang ZHAO,Juan TAN,Xiao-feng XU. Austenite Grain Refinement by Reverse ������� Transformation in Metastable Austenitic Manganese Steel[J]. Chinese Journal of Iron and Steel, 2015, 22(2): 157-162. |
|
|
|
|
2016, Vol. 23 
