Microstructural characterization and thermodynamic analysis of precipitates in ultra-low-carbon bake hardened steel

被引：6

作者：

Lee, Taeg-Woo ^{[1
]}

Kim, Sung-Il ^{[2
]}

Hong, Moon-Hi ^{[3
]}

Kim, Won-Yong ^{[4
]}

Yoo, Young-Gyu ^{[5
]}

Lim, Sung-Hwan ^{[1
]}

机构：

[1] Kangwon Natl Univ, Dept Adv Mat Sci & Engn, Chunchon 200701, Gangwon Do, South Korea

[2] POSCO Tech Res Labs, Sheet Prod & Proc Res Grp, Gwangyang 545090, Jeonnam, South Korea

[3] POSCO Ctr, Seoul 135777, South Korea

[4] Korea Inst Ind Technol, Gangwon Reg Div, Kangnung 210340, South Korea

[5] Korea Inst Ind Technol, Foundry Technol Ctr, Inchon 404170, South Korea

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 582卷

基金：

新加坡国家研究基金会;

关键词：

Metals and alloys; Precipitation; Crystal structure; Transmission electron microscopy; TEM; AIN PRECIPITATION; STRENGTH; NB; NITROGEN; NIOBIUM; FERRITE; ALLOY; MNS; TEM;

D O I：

10.1016/j.jallcom.2013.08.072

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effects of niobium (Nb) addition on the morphologies, size distributions, crystallography, and thermodynamics of precipitates in ultra-low-carbon bake hardened steels (ULC-BH) were investigated using energy-dispersive X-ray spectrometry (EDS), electron diffraction and high resolution transmission electron microscopy (TEM). The calculated nucleation rate of NbC precipitates indicate that the observed fine precipitates and saturation of yield strength with Nb 90 ppm steel are closely connected to thermodynamic factors. A TEM analysis was also carried out for other fine precipitates in two nitride modes: hexagonal AlN and fcc TiN. The Cu2S-MnS complex precipitate was found to manifest a core-shell structure; the core part formed Cu2S and the shell part formed MnS. MnS and Cu2S have an orientation relationship between (0 0 1)(MnS)//(0 0 1)(Cu2S) and [0 0 1](MnS)//[0 0 1](Cu2S). (c) 2013 Elsevier B.V. All rights reserved.

引用

页码：428 / 436

页数：9

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