Mechanisms of tensile improvement in caliber-rolled high-carbon steel

作者：Lee Taekyung; Park Chan Hee; Lee Sang Yoon; Son Il Heon; Lee Duk Lak; Lee Chong Soo^*

来源：Metals and Materials International, 2012, 18(3): 391-396.

DOI：10.1007/s12540-012-3002-6

• metals
• severe plastic deformation
• grain refinement
• mechanical properties
• fracture

The microstructural evolution and tensile characteristics of caliber-rolled plain carbon steels were quantitatively investigated and compared with those of the as-received plain carbon steels. The caliber-rolled steels exhibited a similar microstructure consisting of an ultrafine-grained ferritic matrix and dispersed fine cementite particles. In contrast to the general trend of caliber-rolling processes showing significant reductions in elongation while retaining a high strength, the present caliber-rolled high-carbon steel exhibited simultaneously improved strength and elongation. This distinctive tensile enhancement of the caliber-rolled high-carbon steel was attributed to the increased strain hardening rate caused by the high fraction of submicron cementite particles and to the transition of the fracture mode from a brittle state to a ductile state.

• 出版日期2012-6