MICROSTRUCTURE, MECHANICAL PROPERTIES AND INTERPHASE PRECIPITATION BEHAVIORS IN V-Ti MICROALLOYED STEEL

doi:10.3724/SP.J.1037.2013.00681

Acta Metall Sin

2014, Vol. 50

Issue (5): 524-530 DOI: 10.3724/SP.J.1037.2013.00681

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MICROSTRUCTURE, MECHANICAL PROPERTIES AND INTERPHASE PRECIPITATION BEHAVIORS IN V-Ti MICROALLOYED STEEL

CHEN Jun¹, LÜ Mengyang², TANG Shuai¹(

), LIU Zhenyu¹, WANG Guodong¹

1 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
2 School of Materials and Metallurgy, Northeastern University, Shenyang 110819

Cite this article:

CHEN Jun, LÜ Mengyang, TANG Shuai, LIU Zhenyu, WANG Guodong. MICROSTRUCTURE, MECHANICAL PROPERTIES AND INTERPHASE PRECIPITATION BEHAVIORS IN V-Ti MICROALLOYED STEEL. Acta Metall Sin, 2014, 50(5): 524-530.

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Abstract

The microstructure, mechanical properties and precipitation behaviors in a low carbon V-Ti microalloyed steel were investigated using thermal simulation. The microstructural characteristics of tested steel were analyzed using OM and TEM. The results show that the larger volume fraction of ferrite can be obtained for different isothermal temperatures. The ferrite volume fraction is increased and ferrite grain size is reduced as the isothermal temperature is lowered. The planar interphase precipitation can be observed for different isothermal temperatures, and both sheet spacing and precipitates size are refined by lowering isothermal temperature. Moreover, the nanometer-sized carbides have a NaCl-type crystal structure with a lattice parameter of about 0.436 nm and they can obey one variant of Baker-Nutting (B-N) orientation relationship of (100)_carbide//(100)_ferrite and [011]_carbide//[001]_ferrite. The precipitation hardening for the specimen treated at 680 ℃ for 30 min can reach 360.6 MPa.

Key words: V-Ti microalloyed steel isothermal temperature microstructure interphase precipitation Vickers-hardness

ZTFLH:

TG142.33

Fund: Supported by National Natural Science Foundation of China (No.51204049) and Fundamental Research Funds for the Central Universities (No.N110607003)

About author: null

陈俊, 男, 1982年生, 博士生

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	Jun CHEN
	Mengyang LÜ
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	Zhenyu LIU
	Guodong WANG

URL:

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00681 OR https://www.ams.org.cn/EN/Y2014/V50/I5/524

Fig.1

热模拟工艺示意图

Fig.2

不同等温温度下实验钢的OM像

Fig.3

不同等温温度下实验钢中的铁素体体积分数及晶粒尺寸

Fig.4

不同等温温度下实验钢的典型TEM像

Fig.5

不同等温温度下相间析出列间距及析出粒子尺寸

Fig.6

实验钢在750 ℃下等温30 min 的TEM明暗场像和选区电子衍射花样及其标定

Fig.7

不同等温温度下实验钢的Vickers硬度

Fig.8

不同等温温度下固溶C, V, Ti及(Ti, V)C析出量和系数x

表1 不同等温温度下实验钢的屈服强度及其分量

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