Abstract
The microstructures and deformation behavior of normalized and normalized and cold rolled 1.45 Mn-0.21 Si-0.08 C steel subjected to intercritical annealing between 717 and 835°C were evaluated and compared. All specimens developed multiple stages of strain hardening, with more pronounced second stages characteristic of specimens annealed at the lower temperatures. Specimens with initially cold rolled structures prior to intercritical annealing exhibit lower yield strengths, higher strain hardening rates at high strains, and higher uniform elongations than do identically treated specimens with initially normalized structures. The improved deformation behavior of the initially cold rolled specimens is attributed to the fine ferritic grain size and dispersions of fine martensite particles which develop when the cold rolled steels are intercritically annealed.
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