Defects and Particles in Laboratory Hot Rolled Steel of C-Mn-Cr-Nb Type

被引：0

作者：

Kawulok, Petr ^{[1
]}

Schindler, Ivo ^{[1
]}

Sojka, Jaroslav ^{[1
]}

Rusz, Stanislav ^{[1
]}

Kawulok, Rostislav ^{[1
]}

Sima, Vladimir ^{[2
]}

Hanus, Pavel ^{[3
]}

Turon, Rostislav ^{[4
]}

Turonova, Petra ^{[4
]}

机构：

[1] VSB Tech Univ Ostrava, Fac Met & Mat Engn, Ostrava, Czech Republic

[2] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic

[3] Tech Univ Liberec, Fac Mech Engn, Liberec, Czech Republic

[4] Trinecke Zelezarny, Trinec, Czech Republic

来源：

METALLOGRAPHY XV | 2014年 / 782卷

关键词：

low-alloy steel; hot rolling; metallography; electron microscopy; EDS analysis; inclusion; precipitate;

D O I：

10.4028/www.scientific.net/MSF.782.221

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Susceptibility to cracking of the as-cast C-Mn-Cr-Nb steel was studied by laboratory rolling. The variable parameters were the heating temperature (1150 - 1340 degrees C) as well as the rolling temperature (950 - 1150 degrees C). Final microstructure of the free-cooled samples was constituted by bainite, pearlite and ferrite with different morphology and various contribution. Deformation temperature below 1000 degrees C yielded in the incomplete recrystallization of austenite. Surface cracks originated preferentially on the austenite grains' boundaries. Size of the present particles (inclusions and precipitates) varied from 10(-8) m to 10(-5) m. SEM and EDS analysis revealed that the inclusions ware mostly of the MnS type. TEM analysis confirmed that the grain boundaries were not enriched by any particles. In addition to the Fe3C particles, the discoid niobium carbide particles with approximately 40 nm diameter and 10 nm thickness were detected. These small particles were not related to pinning of dislocations.

引用

页码：221 / +

页数：2

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