Tailoring the microstructure for microalloyed carburizing steels by an ICME approach

Integrative Computational Materials Engineering (ICME) is a new method for efficient development of new materials and new processes by computer-based simulation on different length scales over different process steps. We developed ICME tools and applied them successfully for several new concepts for Nb microalloyed gear steels. A common ICME platform that combines empirical and rigorous models for casting, rolling, forging, machining, heat treatment and welding has been developed and evaluated for several test cases. The platform requirements and the simulation tools used are described. Our ICME approach has been successfully demonstrated for the development of new case hardening steels with a reduced Al content to meet the requirements of improved cleanness and lifetime. By microalloying with Nb a stable, fine grain size can be ensured, even for an energy efficient high temperature case hardening heat treatment. (AU) © 2015 Companhia Brasileira de Metalurgia e Mineração (CBMM)