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

被引：11
作者：
Kang, M. H. [1 ]
Lee, J. S. [1 ]
Koo, Y. M. [1 ]
Kim, S. -J. [1 ]
Heo, N. H. [1 ]
机构：
[1] Pohang Inst Sci & Technol POSTECH, GIFT, Pohang 790784, South Korea
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2014年 / 45A卷 / 10期
关键词：
GRAIN-BOUNDARY SEGREGATION; LOW-CARBON STEELS; NONEQUILIBRIUM SEGREGATION; TRANSVERSE CRACKING; CREEP CAVITATION; PRECIPITATION; SULFUR; EMBRITTLEMENT; IRON; MN;
D O I：
10.1007/s11661-014-2402-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
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.
引用
收藏
页码：4302 / 4306
页数：5
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