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 microstructure change by warm deformation in high-carbon steels with differentinitial ferrite (α) + cementite (θ) duplex microstructures has been examined. Three kinds of initialstructures, i.e., pearlite, α+spheroidized θ and tempered martensite, were prepared usingFe-0.8C-2Mn and Fe-1.0C-1.4Cr alloys and compressed by 30-75% at 973K at a strain rate of5x10-4 s-1. Equiaxed fine α grains, approximately 2μm in diameter and mostly bounded byhigh-angle boundaries, are formed with spheroidized θ by dynamic recrystallization duringcompression of the pearlite by 75%. When the (α+θ) duplex structure containing spheroidized θwas deformed, the original α grains become elongated and only subgrains are formed within themby dynamic recovery. For the tempered martensite, equiaxed α grains similar to those in thedeformed pearlite were obtained after 50% compression. This indicates that the critical strainneeded for the completion of dynamic recrystallization of α is smaller for the tempered martensitethan for the other structures
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.155.pdf
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