Establishing the cause of failure in continuous casting rolls

被引：11

作者：

Hadizadeh, B. ^{[1
,2
]}

Bahrami, A. ^{[2
]}

Eslami, A. ^{[2
]}

Abdian, K. ^{[2
]}

Araghi, M. Younes ^{[2
]}

Etezazi, M. ^{[1
]}

机构：

[1] MIRCO, Esfahan, Iran

[2] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran

来源：

ENGINEERING FAILURE ANALYSIS | 2020年 / 108卷

关键词：

Failure; Continuous casting; Rolls; Sigma phase; SIGMA-PHASE PRECIPITATION; MECHANISM;

D O I：

10.1016/j.engfailanal.2019.104346

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This paper investigates failure of repair welded continuous casting rolls. Observed failures are in the form of localized corrosion, initiated at boundaries between two welding passes. Defects were categorized into three typical damages: zebra lines, partially interconnected zebra lines, and fully connected zebra lines. In some cases, star like features were also distributed on the surface of the roll. Optical microscope, scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS) were used to characterize microstructure of failed rolls. Damage is appeared to be initiated from elongated greyish phases, which are rich in Cr. These phases are at intermediate states between delta ferrites and sigma phase. Cr enrichment of delta ferrite during service is associated with Cr depletion of the matrix and this in turn makes these phases susceptible to the initiation of corrosion.

引用

页数：8

共 24 条

[1] On the wear behavior of surface clad layers under high temperature [J].