An Observation of Micro-crack in Transformation-induced Plasticity-assisted Multiphase Steel

被引：8
|
作者：
Lee, Seung Hyun [1 ]
Lee, Sang Hoon [2 ]
Kang, Suk Hoon [2 ]
Han, Heung Nam [2 ]
Oh, Kyu Hwan [2 ]
Lee, Hu-Chul [2 ]
机构：
[1] Adv Technol Ctr, Mat Technol & Anal Team, Hwaseong Si 445706, Gyeonggi Do, South Korea
[2] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea
来源：
ISIJ INTERNATIONAL | 2008年 / 48卷 / 10期
关键词：
TRIP steels; crack initiation; focused ion beam (FIB); transmission electron microscopy (TEM);
D O I：
10.2355/isijinternational.48.1394
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
In a transformation-induced plasticity (TRIP)-assisted multiphase steel, the phases around a micro-crack at the initial stage of cracking during wire drawing were observed by a focused ion beam (FIB), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). A novel FIB method, which is termed as "In-plane lift-out" technique, was applied to obtain an overall plan-view of the TEM specimen containing the micro-crack. The equilibrium concentration ratio of Mn in austenite and ferrite was calculated for the alloy and compared with the EDS line profile of Mn concentration across the micro-crack in the TEM specimen. The interface between the ferrite and martensite was identified as the crack initiation site during drawing of this multi-phase steel.
引用
收藏
页码：1394 / 1397
页数：4
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