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Fine tuning the mechanical properties of dual phase steel via thermomechanical processing of cold rolling and intercritical annealing
- Source :
- Materials Chemistry and Physics. 230:1-8
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- The simultaneous effects of cold rolling reduction and intercritical annealing time on the microstructure and tensile properties of St12 steel were studied. It was revealed that by increasing the rolling reduction, the ferrite grain size of the dual phase (DP) microstructure is refined and a chain-like morphology of martensite develops, which results in improvement of work-hardening capacity and the tensile properties. Such a microstructure can be obtained via applying an optimum holding time at the intercritical annealing temperature. Beyond that optimum, grain coarsening occurs with the resulting deterioration of tensile properties. It was also shown that by consideration of quenched sheet or by applying low reductions in thickness, secondary recrystallization or abnormal grain growth (AGG) takes place during intercritical annealing, which is characterized by small grains and some large ferrite grains containing martensite islands. This study clarified that applying high reduction in thickness for grain refinement and also controlling the holding time in the two-phase austenite-ferrite region are the essential prerequisites to achieve the desired tensile strength, ductility, and toughness.
- Subjects :
- Toughness
Materials science
Dual-phase steel
Recrystallization (metallurgy)
02 engineering and technology
Abnormal grain growth
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Microstructure
01 natural sciences
0104 chemical sciences
Martensite
Ultimate tensile strength
Thermomechanical processing
General Materials Science
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 02540584
- Volume :
- 230
- Database :
- OpenAIRE
- Journal :
- Materials Chemistry and Physics
- Accession number :
- edsair.doi...........238bf141b91323954199fb235ebedb5c
- Full Text :
- https://doi.org/10.1016/j.matchemphys.2019.03.053