Mechanism of Strengthening by Vanadium Carbide Precipitation in Pearlite in Microalloyed Steels

被引：10

作者：

Daitoh, Yoshihiro ^{[1
]}

Torizuka, Shiro ^{[2
]}

Hanamura, Toshihiro ^{[2
]}

机构：

[1] Sumimoto Met Kokura Ltd, Consortium JRCM, Kokurakita Ku, Kitakyushu, Fukuoka 8028686, Japan

[2] Natl Inst Mat Sci, Consortium JRCM, Tsukuba, Ibaraki 3050047, Japan

来源：

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN | 2011年 / 97卷 / 09期

关键词：

microalloyed steel; vanadium carbide; interphase boundary precipitation; strengthening mechanism;

D O I：

10.2355/tetsutohagane.97.480

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

In microalloyed steel, industrial candidate for application to parts of automobiles, we investigated strengthening mechanism by vanadium carbide (VC) precipitation in the pearlite. The specimens, containing 0.1-0.65% carbon (C) and 0-0.4% vanadium (V), were quenched from 1200 to 650-550 degrees C and kept at this temperature. The more V and the lower transformation temperature, the higher strength can be obtained. The maximum 0.2% proof strength is determined to be 1450 MPa for 0.65%C-0.4%V steel and 1200 MPa for 0.65%C-0.2%V steel. VC is found to precipitate at interphase boundaries between the austenite and the ferrite in the pearlite. When the transformation temperature is lowered, the VC size becomes finer and the precipitation density increases. These results suggest that the strengthening mechanism by VC is the Orowan-type. The amount of precipitation strengthening by VC was calculated by Ashby-Orowan equation. Both the calculated and the experimental results were determined to have good correlation. Strengthening mechanism by VC and that by pearlite lamellar would be competitive, however the amount of precipitation strengthening by VC in pearlite was close to that in ferrite.

引用

页码：480 / 485

页数：6

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