Effects of martensite morphology and tempering on dynamic deformation behavior of dual-phase steels |
| |
| Authors: | Han Sang Lee Byoungchul Hwang Sunghak Lee Chang Gil Lee Sung-Joon Kim |
| |
| Affiliation: | (1) the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Korea;(2) the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784 Pohang, Korea;(3) the Materials Science and Engineering Department, Pohang University of Science and Technology, Korea;(4) the Materials Processing Department, Korea Institute of Machinery and Materials, 641-010 Changwon, Korea |
| |
| Abstract: | The effects of martensite morphology and tempering on the quasistatic and dynamic deformation behavior of dual-phase steels
were investigated in this study. Dynamic torsional tests were conducted on six steel specimens, which had different martensite
morphologies and tempering conditions, using a torsional Kolsky bar, and then the test data were compared via microstructures, tensile properties, and fracture mode. Bulky martensites were mixed with ferrites in the step-quenched (SQ)
specimens, but small martensites were well distributed in the ferrite matrix in the intermediate-annealed (IA) specimens.
Under a dynamic loading condition, the fracture mode of the SQ specimens was changed from cleavage to ductile fracture as
the tempering temperature increased, whereas the IA specimens showed a ductile fracture mode, irrespective of tempering. These
phenomena were analyzed in terms of a rule of mixtures applied to composites, microstructural variation, martensite softening
and carbon diffusion due to tempering, and adiabatic shear-band formation. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
