Online Lecture by prof. Francisca G. Caballero

What sets bainite and martensite apart and what makes them similar?

National Centre for Metallurgical Research (CENIM-CSIC)
Materalia Group – Physical Metallurgy Dept
Madrid, Spain

Title:
What sets bainite and martensite apart and what makes them similar ?

Abstract:
This study investigates the differences and similarities between bainitic and martensitic structures obtained by isothermal heat treatments such as austempering, quench and partitioning (Q&P), and quench and tempering (Q&T) using a variety of techniques such as X-ray diffraction, electron backscatter diffraction, scanning and transmission electron microscopy, and atom probe tomography.

The results show that by varying the isothermal holding temperature, identical austenite concentration may be obtained in ferritic structures that resemble laths.

Nonetheless, some diversity in hardness is noted, which is compatible with variations in the crystallographic size distribution of ferritic grains and variations in the precipitation state as shown by the structure’s nanoscale analysis.

This session was chaired by prof. Annika Borgenstam (KTH Stockholm)