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Boron Effect on the Softening Parameter (Ω) of Advanced Ultra-High Strength Steels (A-UHSS) under Uniaxial Hot-Compression Conditions

Published online by Cambridge University Press:  01 October 2015

E. García-Mora ,
I. Mejía  and
J.M. Cabrera
E. García-Mora
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U-5”, Ciudad Universitaria, 58066 – Morelia, Michoacán, México. E-mail: elviramora@yahoo.com, imejia@umich.mx
I. Mejía
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U-5”, Ciudad Universitaria, 58066 – Morelia, Michoacán, México. E-mail: elviramora@yahoo.com, imejia@umich.mx
J.M. Cabrera
Affiliation:
Departament de Ciència dels Materials i Enginyeria Metal•lúrgica, ETSEIB – Universitat Politècnica de Catalunya. Av. Diagonal 647, 08028 – Barcelona, Spain. Fundació CTM Centre Tecnològic, Av. de las Bases de Manresa, 1, 08240 – Manresa, Spain.
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Abstract

Advanced ultra-high strength steels (A-UHSS) are revolutionizing both the steel and automotive industries, therefore it is imperative to study their hot plastic deformation behavior and modeling. The flow characteristics of all hot forming processes consist basically of two competitive phenomena: strain hardening and softening due to dynamic mechanisms (recovery and/or recrystallization). In this research work, the softening parameter was determined in a low carbon A-UHSS microalloyed steel with different amounts of boron (0, 14 and 214 ppm). Experimental stress–strain data of uniaxial hot-compression tests at different temperatures (950, 1000, 1050 and 1100 °C) and strain rates (10–3, 10–2 and 10–1 s–1) were used. The stress–strain relationships as a function of temperature and strain rate were described on the basis of the Estrin, Mecking, and Bergström model. The experimental values of the softening parameter Ω were adjusted using the least-squares method. In general, the results reveal that the softening parameter increases with increasing boron content.

Keywords

Restress/strain relationshipB
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1765: Symposium 4A – Advanced Structural Materials—2014 , 2015 , pp. 97 - 102
Copyright
Copyright © Materials Research Society 2015 

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References

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