|
|
|
| Precipitation Behavior of V-N Microalloyed Steels during Normalizing |
| Tao PAN1, Xi-yang CHAI1, Jin-guang WANG2, Hang SU1, Cai-fu YANG1 |
1. Division of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
2. Division of Equipment Construction, China Sinopec Engineering Incorporation, Beijing 100101, China |
|
|
|
|
Abstract The precipitation behavior of V-N microalloyed steel during normalizing process was studied by physicochemical phase analysis and transmission electron microscopy (TEM). The effect of precipitation behavior on mechanical properties was investigated by theoretical calculations. The results showed that 32.9% of V(C,N) precipitates remained undissolved in the austenite during the soaking step of the normalizing process. These precipitates prevented the growth of the austenite grains. During the subsequent cooling process, the dissolved V(C,N) re-precipitated and played a role in precipitation strengthening. The undissolved V(C,N) induced intragranular ferrite nucleation and refined the ferrite grains. Consequently, compared with hot-rolled steel, the normalized steel exhibited increased grain-refining strengthening but diminished precipitation strengthening, leading to an improvement of the impact energy at the expense of about 40 MPa yield strength.
|
|
Received: 23 October 2014
Published: 09 November 2015
|
| Fund:���ҿƼ�֧�żƻ� |
|
Corresponding Authors:
Tao PAN
E-mail: taopan@vip.sina.com
|
|
|
|
| [1] |
Hong-bo Pan,,*,Meng-jiao Zhang,Wei-ming Liu,,Jun Yan,,Hui-ting Wang,Chang-sheng Xie,Zhan Guo. Effects of micro-alloying and production process on precipitation behaviors and mechanical properties of HRB600[J]. Chinese Journal of Iron and Steel, 2017, 24(5): 536-543. |
| [2] |
Zheng-yan ZHANG,,Qi-long YONG,Xin-jun SUN,Zhao-dong LI,Jun-yu KANG,Guo-dong WANG. Microstructure and Mechanical Properties of Precipitation Strengthened Fire Resistant Steel Containing High Nb and Low Mo[J]. Chinese Journal of Iron and Steel, 2015, 22(4): 337-343. |
| [3] |
Wen-jie ZHENG,Xian-ping WEI,Zhi-gang SONG,Qi-long YONG,Han FENG,Qing-cheng XIE. Effects of Carbon Content on Mechanical Properties of Inconel 718 Alloy[J]. Chinese Journal of Iron and Steel, 2015, 22(1): 78-83. |
| [4] |
Bin-hao HU,Qing-wu CAI,Hui-bin WU. Influence of Mo on Growth and Coarsening of Nanometer-sized Carbides in Low-alloy Ferritic Steels Containing Ti[J]. Chinese Journal of Iron and Steel, 2014, 21(9): 878-885. |
| [5] |
Chen LING,Li XIANG,Sheng-tao QIU,Yong GAN. Effects of Normalizing Annealing on Grain-oriented Silicon Steel[J]. Chinese Journal of Iron and Steel, 2014, 21(7): 690-694. |
| [6] |
Xiao-pei WANG,,Ai-min ZHAO,Zheng-zhi ZHAO,Yao HUANG,Zhi-da GENG,Yang YU. Precipitation Strengthening by Nanometer-sized Carbides in Hot-rolled Ferritic Steels[J]. Chinese Journal of Iron and Steel, 2014, 21(12): 1140-1146. |
|
|
|
|
2015, Vol. 22 
