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:
Strain rate sensitivity of the strength of TWIP (Twinning Induced Plasticity) steel with themixture of recrystallized fine grains and rolling-deformation microstructures was studied. The31mass%Mn-3%Al-3%Si TWIP steel sheet was severely cold-rolled to a reduction of 92% andsubsequently annealed at various temperatures ranging from 600oC to 700oC in order to obtain thepartial recrystallized microstructure with various fraction of recrystallized microstructure. The 600oCannealed specimen keeps similar morphologies as observed in the as-rolled structure consisting ofboth the fine lamellar dislocation cell structure and the twin/matrix lamellar structure; whereas, in thespecimen annealed at 625oC or 675oC , the partially recrystallized fine grains (d~1µm) with a fewdislocations evolve. The volume fraction of recrystallized fine grains increases with increasing of theannealing temperature while the mean diameter of the recrystallized grains is not changed largely. Thetensile deformation behaviors were measured at various strain rates ranging from 10-3sec-1 to 102sec-1.The strength and elongation become smaller and larger, respectively, with increasing the fraction ofthe recrystallized microstructure. The activation volume of dislocations becomes larger withincreasing the fraction of recrystallized microstructure
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.673.pdf
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