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

页码：1394 / 1397

页数：4

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