Root cause analysis of an unexpected brittle failure in a carbon steel slab

被引：3
|
作者：
Keramatian, Ali [1 ]
Bahrami, Abbas [1 ]
Darougheh, Amir Hossein [1 ]
Zare, Shahin [2 ]
机构：
[1] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran
[2] Hormozgan Steel Co HOSCO, Bandar Abbas, Iran
来源：
ENGINEERING FAILURE ANALYSIS | 2021年 / 122卷
关键词：
Steel slab; Transverse crack; Failure analysis; SURFACE-DEFECTS; METALLURGICAL ASPECTS; CRACK FORMATION; HOT;
D O I：
10.1016/j.engfailanal.2020.105205
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
This paper investigates the root cause of an unexpected brittle transverse cracking in a carbon steel slab. The observed failure in the form of a deep and relatively straight transverse crack appeared in the middle of the slab during storage before hot rolling. The microstructure of the failed slab, and more specifically that in the vicinity of the crack were studied using electron and optical microscopy. Energy-dispersive X-ray spectroscopy (EDS) was used to study the chemical composition of different phases, observed in the microstructure. Analysis of the chemical composition of the alloy showed that chromium and nitrogen contents of the failed slab were out of standard range. Results of fractography showed that grain boundary de-cohesion and trans granular fracture were dominant features in the fracture surface. Correlations between microstructure, processing parameters, and observed abnormal brittle fracture were discussed.
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页数：12
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