ICAMS / Interdisciplinary Centre for Advanced Materials Simulation

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Nano precipitates in high carbon bearing steel 100Cr6

Date: 29.10.2013
Time: 10:00 a.m.
Place: MS&T'13, Montréal, Canada

Wenwen Song
Ulrich Prahl
Wolfgang Bleck

Nano precipitates within martensite and bainite play a very important role in determining their high strength and good fatigue properties in high carbon steels which are widely used in automotive components and bearing applications. In the present work, nano-sized metastable carbide precipitation and elemental partitioning behavior in lower bainite were investigated in high carbon bearing steel 100Cr6 by means of Transmission Electron Microscopy (TEM) in combination with multiphase field simulations using MICRESS software. In the phase field model, both bainitic ferrite and carbide growth modes are considered to be faceted. The carbon concentration within bainitic ferrite is an input value on the basis of our previous published atom probe measured data. The simulated microstructure evolution results show good agreement with TEM experimental results. Deeper insights into the nature of ε and θ carbide precipitation mechanisms were gained and the microstructure-property relationships of the material can be better explained.

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