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 properties of ultrahigh carbon steels (UHCS) are strongly influenced by aluminumadditions. Hardness studies of quenched UHCS-Al alloys reveal that the temperature for the start oftransformation increases with increases in aluminum content. It is shown that this change is afunction of the atomic percent of solute and of the valence state when comparisons are made withUHCSs containing silicon and tin as solutes. The thermal expansion of UHCSs with dilutealuminum additions shows no discontinuity in the vicinity of the ferrite-austenite transformationtemperature. This is the result of a three phase region of ferrite, carbides and austenite. The slope ofthe expansion curve is higher in the austenite range than in the ferrite range as a result of thedissolution of carbon in austenite with temperature. Processing to achieve a fine grain size inUHCS-Al alloys was principally by hot and warm working (HWW) followed by isothermal warmworking (IWW). The high temperature mechanical properties of a UHCS-10Al-1.5C material shownearly Newtonian-viscous behavior at 900 to 10000C. Tensile elongations of 1200% without failurewere achieved in the 1.5%C material. The high oxidation corrosion resistance of the UHCS-10Almaterials is described
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4844.pdf
