Phase transformations in heat-affected zones of ferritic heat-resistant steels
Channel: bhadeshia123
Date: 14/03/2022

A talk by Professor Cong Wang of the oxide metallurgy group at  Northeastern University in China. After introducing power plant issues he describes the need for new creep-resistant materials that would be needed to increase steam temperatures in the context of thermodynamic efficiency. This in turn leads to welding, and problems associated with the microstructures within the heat-affected zones of the welds, leading to cracking. The focus then shifts to acicular ferrite that nucleates intragranularly in austenite grains containing non-metallic inclusions. Confocal laser microscopy is used to monitor the growth of plates. The properties in the heat-affected zones are also explained.