Structural Analysis and Design of Foundations: A Comprehensive Handbook for S...
KIAU-Materials Dep.
1. Dr. A. Salemi Golezani
Department of Materials Eng., Islamic Azad University-
Karaj Branch
Mechanical Behavior of CrMo Steel with
Tempered Martensite and Ferrite-Bainite-
Martensite Microstructure
2. From Low Carbon to Advanced High Strength
Conventional Steels
Low Carbon
Bake Hardenable
Solid Solution Strengthened
High Strength Low Alloy
elAdvanced High Strength Ste
Dual Phase
Complex Phase
Transformation Induced Plasticity
Martensitic
3. Complexe phase steels which contain martensite, bainite,
ferrite and/or retained austenite in quantities sufficient to
produce unique mechanical properties. These steels
exhibit an excellent combination of high strength and high
ductility results.
Definition of Complex Phase
18. Yield Drop Effect
Pinning of dislocation by:
Solute atoms
Formation of short range order region near dislocation
Electrical charge of solute atoms and depositing on
dislocations
Dislocation generation
21. Conclusions
Mechanical properties of tempered martensite, is
more favorable than F-B-M microstructure.
Decreasing bainite transformation temperature from
430 to 400o
C, increases yield and tensile strength but
decreases in impact energy.
22. Conclusions
Fractography of the Charpy impact specimens
indicates ductile and transgranular fracture
mechanisms in quench tempered and step quenched
specimens, respectably.
Yield drop effect was observed in F-B-M
microstructure with ferritic matrix.
23. Thank You for Your AttentionThank You for Your Attention