Precipitation Behavior of V-N Microalloyed Steels during Normalizing

被引：24
|
作者：
Pan, Tao [1 ]
Chai, Xi-yang [1 ]
Wang, Jin-guang [2 ]
Su, Hang [1 ]
Yang, Cai-fu [1 ]
机构：
[1] Cent Iron & Steel Res Inst, Div Struct Steels, Beijing 100081, Peoples R China
[2] China Sinopec Engn Inc, Div Equipment Construct, Beijing 100101, Peoples R China
来源：
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2015年 / 22卷 / 11期
关键词：
normalizing; V-N microalloyed steel; precipitation strengthening; grain-refining strengthening; GRAIN-REFINEMENT; VANADIUM; AUSTENITE;
D O I：
10.1016/S1006-706X(15)30109-6
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
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.
引用
收藏
页码：1037 / 1042
页数：6
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