DrCharline Le Nue

Processing–microstructure–property relationships

My research addresses the processing–microstructure–property relationship in structural steels and alloys — how processing routes and heat treatment parameters control phase transformations and microstructural evolution, and in turn how that microstructure governs mechanical performance. I work across several alloy systems, including maraging stainless steels, high-chromium cast irons, medium-manganese steels, and pearlitic steels.

Precipitation, phase transformations, and ageing behaviour

My research examines how precipitation hardening and phase transformation mechanisms respond to processing variables such as cooling rate and ageing conditions, and how this in turn governs the scatter observed in mechanical properties. In my PhD work, I identified the microstructural origin of fracture toughness degradation caused by slower cooling after ageing in a precipitation-hardened stainless steel, and used this understanding to propose a modified ageing treatment that improved the strength–toughness trade-off.

Computational alloy design and thermodynamic modelling (CALPHAD)

I use CALPHAD-based thermodynamic modelling to predict how composition and processing choices affect phase stability, precipitate/carbide type and distribution, and heat treatment windows — applying this to three distinct problems: designing new low-density steel systems, improving existing grades by tailoring hardening precipitates, and optimising heat treatments on well-established alloys. I combine this computational approach with experimental validation to accelerate and de-risk alloy and process development.

Sustainable and cost-effective alloy design

I am interested in how alloy design decisions can reduce reliance on costly or critical raw materials, lower component weight, and extend service life through improved wear resistance and mechanical properties — aligning materials performance with cost and sustainability goals. 

Multi-scale microstructure characterisation

Because microstructural features relevant to mechanical behaviour span scales from micrometres to atoms, my research relies on a multi-technique characterisation strategy — SEM, EBSD, conventional and synchrotron XRD, dilatometry, DTA, SANS, and atom probe tomography (APT) — to connect microstructural evolution directly to macroscopic properties such as tensile behaviour, fracture toughness, hardness, nano-indentation and wear resistance.