The Mechanism of Hot Ductility Loss and Recovery in Nb-Bearing Low Alloy Steels

被引：0
|
作者：
M. H. Kang
J. S. Lee
Y. M. Koo
S.-J. Kim
N. H. Heo
机构：
[1] Pohang Institute of Science and Technology (POSTECH),Graduate Institute of Ferrous Technology (GIFT)
来源：
Metallurgical and Materials Transactions A | 2014年 / 45卷
关键词：
Continuous Casting; Auger Electron Spectroscopy; Intergranular Crack; Segregation Concentration; Elevated Temperature Range;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In low alloy steels containing Nb, the poor hot ductility is basically due to the austenite grain boundary segregation of sulfur and the additional matrix strengthening of Nb(C,N) precipitates, both of which decrease the equicohesive temperature. The recovery of hot ductility is therefore attributed to not only the clean grain boundaries that the segregated sulfur is scavenged through the MnS reaction but also the matrix softening by the coarse Nb(C,N) precipitates.
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页码：4302 / 4306
页数：4
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