Iso-Work-Rate Weighted-Taylor Homogenization Scheme for Multiphase Steels Assisted by Transformation-induced Plasticity Effect

2007 ◽  
Vol 78 (10-11) ◽  
pp. 777-783 ◽  
Author(s):  
Denny Tjahjanto ◽  
Franz Roters ◽  
Philip Eisenlohr
Keyword(s):  
Work Rate ◽  
Transformation Induced Plasticity ◽  
Plasticity Effect ◽  
Homogenization Scheme ◽  
Multiphase Steels

Microstructure Optimization in δ-TRIP Steels with Al and Nb

2018 ◽  
Vol 930 ◽  
pp. 501-506
Author(s):  
Eustáquio de Souza Baêta Júnior ◽  
Ramón Alves Botelho ◽  
Leonardo Sales Araújo ◽  
Luiz P. Brandão ◽  
Sergio Neves Monteiro
Keyword(s):  
Chemical Composition ◽  
Alloying Elements ◽  
Eutectoid Temperature ◽  
Transformation Induced Plasticity ◽  
Trip Steels ◽  
Plasticity Effect ◽  
Δ Ferrite ◽  
Areas Of Interest ◽  
Thermocalc Software ◽  
Strength And Ductility

δ-TRIP steel is a recent concept and has been developed over the last ten years aiming to combine good mechanical strength and ductility. This class of steels is multiphase and contains δ and α ferrites, as well as austenite, bainite and/or martensite. The TRIP (Transformation Induced Plasticity) effect is influenced by those phases proportion, which depends on alloying contents. This paper investigates a chemical composition that allows adequate proportion among the phases, optimizing the microstructures by means of computational methods. These microstructures are designed to contain between 10 to 50% austenite, 10 to 70% α-ferrite and 20 to 80% δ-ferrite at the eutectoid temperature. The ThermoCalc Software [1] was used to predict the fractions of the microconstituents, producing graphs describing areas of interest of microconstituents as function of alloying elements variations that leads to the desired microstructure. Results indicate that the designed volume of the phases can be found for certain proportions among the alloying elements, higher concentrations of Al and Nb combined with C allow or not the occurrence of carbides and other phases in smaller quantities.

On the sources of work hardening in multiphase steels assisted by transformation-induced plasticity

2001 ◽  
Vol 81 (7) ◽  
pp. 1789-1812 ◽  
Author(s):  
P. Jacques ◽  
Q. Furnémont ◽  
A. Mertens ◽  
F. Delannay
Keyword(s):  
Work Hardening ◽  
Transformation Induced Plasticity ◽  
Multiphase Steels
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