Abstracts Book - IMRC 2018

• SE2-O005 Invited Talk
SIMULATION OF COMPLEX THERMAL CYCLES USING QUENCHING
DILATOMETRY: A TOOL FOR PRODUCT DEVELOPMENT FOR
CONTINUOUS PROCESSING OF AHSS-DP STEELS
Armando Salinas Rodriguez 1 , Gerardo Altamirano Guerrero 2 , Patricia Sheilla Costa 1 , Frank E
Goodwin 3
1 Cinvestav-Unidad Saltillo, Metallurgy, Mexico. 2 Instituto Tecnológico de Saltillo, , Mexico.
3 International Lead Zinc Research Org., Inc., , United States.
The present work describes a methodology developed to design optimum
routes for continuous processing of AHSS-DP strips. Industrial production of
dual phase steel strips requires the design of fast thermal treatments which
include inter-critical austenization, interrupted cooling and reheating stages
together with high heating and cooling rates. Ms temperatures of AHSS-DP steel
grades are generally lower than 460 °C, therefore, the required ferritemartensite
microstructures are difficult to produce. The methodology
developed shows how quenching-induction dilatometry using miniature tensile
test specimens, statistical experimental design and multi-objective modelling
employing Response Surface Methodology, and process optimization using nondominated
sorting genetic algorithms, can be applied as a tool for product
development for continuous processing of AHSS-DP steel strips. The
methodology is illustrated for the case of production of an AHSS-DP steel strip
with minimum UTS of 1100 MPa, YS between 550 and 750 MPa, a minimum
elongation to fracture of 10% and a YS/UTS
Keywords: thermomechanical treatment, quenching dilatometry, statistical modelling
Presenting authors email: armando.salinas@cinvestav.edu.mx