加拿大不列颠哥伦比亚大学Matthias Militzer教授来RAL访问讲学

12月9日上午，应轧制技术及连轧自动化国家重点实验室（RAL）邀请，加拿大不列颠哥伦比亚大学材料工程系Matthias Militzer教授访问我室，在411学术报告厅为师生作了题为“Phase field simulation of microstructure evolution in metals and alloys”的学术报告，报告会由贾涛副教授主持。

专家简介：

Matthias Militzer博士是加拿大不列颠哥伦比亚大学（University of British Columbia）材料工程系教授、ArcelorMitaal（Dofasco）钢铁公司先进钢铁加工领域首席科学家；主要研究领域包括微观组织演变的多尺度模拟、先进高强钢的物理冶金学基础理论与模型研究、先进微电子领域的新型铜互联等。

报告摘要：

Phase field modelling is a powerful methodology to simulate microstructure evolution during thermo-mechanical processing of metals and alloys. The status of phase field simulations will be illustrated with examples for recrystallization and grain growth as well as phase transformations. The first example deals with recrystallization in an Al alloy that occurs by sub-grain growth where both the energy and mobility of the sub-grain boundaries depend on their disorientation angles. Another case where mobility distributions are relevant is related to abnormal grain growth. Here, a systematic parametric simulation study will be presented to quantify the mobility advantages for selected grain boundaries required to initiate abnormal growth. Further, two examples for phase transformations in low-carbon steels will be used to illustrate phase field modelling in combination with diffusion of alloying elements. The austenite decomposition into ferrite and bainite has been simulated for a line pipe steel. The model has been applied to predict the microstructure in the weld heat affected zone. Finally, a phase field model will be discussed for intercritical annealing of a dual-phase steel. Here, ferrite recrystallization, austenite formation and decomposition are included in the model to create processing maps for the investigated steel.