ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The behavior of the surface oxide scale on steel products during hot rolling processinfluences the surface properties of final products. To investigate the deformation and the fracturebehavior of surface oxide scale of Fe-13Cr alloy, a hot rolling test was carried out. The oxide scalerolled out was observed in detail by using TEM. The specimen was hot-rolled after oxidation at1100[removed info] for 90 minutes in air. The hot rolling tests with two conditions ([removed info]. The hot rolling test ofthe outer scale {=whole layer scale} , [removed info]. The hot rolling test of the inner scale that removed theouter scale) were carried out. The rolling reduction rate was 25, 44, 58, and 68%. The outer scalewas composed of Fe2O3 and F3O4, and the inner scale was composed of Fe3O4, FeCr2O4, and a smallamount of Fe2SiO4. Fe2SiO4 formed along the grain boundaries of the other oxides (Fe3O4, FeCr2O4)was observed by TEM. In the test [removed info], Fe2O3 of the outer scale was pulverized to fine particle thatlooks like red powder, and Fe3O4 of the outer scale was cracked by hot rolling. A ductility-likebehavior was observed in the inner scale (Test [removed info]). That is, it was found by the SEM observationthat porosity and micro cracks of the surface oxide disappeared gradually according to the increasein the rolling reduction. It was thought that the porosity and the micro cracks eased the compressionstress caused by hot rolling. In the case of high reduction rate, FeSi2O4 ,which is a low melting pointoxide, formed on grain boundary caused grain boundary slipping. When the rolling reduction is veryhigh, plastic deformation by dislocation occurred in Fe3O4 and FeCr2O4. However, these oxideswere broken, when their plasticity would not be able to accept considerably high rolling reduction
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.522-523.461.pdf
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