Heat Treatment Effects on Martensitic Stainless Steel Properties

Martensitic stainless steels are characterised by a body-centred tetragonal martensite matrix, offering high strength and moderate corrosion resistance. Controlled heat treatments—including quenching, tempering and intercritical annealing—tailor their microstructure by adjusting the balance between martensite, tempered martensite and reverted austenite. Quenching from the austenitization temperature generates a supersaturated martensite, maximising hardness but often at the expense of toughness. Subsequent tempering induces carbide precipitation and partial recovery of dislocations, reducing internal stresses and enhancing ductility. Advanced routes such as intercritical annealing, performed between the Ac1 and Ac3 temperatures, introduce a dual‐phase structure that refines prior austenite grains, moderates hardness and boosts impact toughness. Heat input during welding and cladding also acts as a local tempering treatment, defining the heat-affected zone and influencing residual stresses, dilution and hardness gradients. Overall, optimisation of heating rate, soak time and cooling path enables a spectrum of properties—from ultra-high strength in springs and actuators to improved toughness in turbine components—underpinning global applications in energy, chemical processing and defence industries.

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Heat Treatment Effects on Martensitic Stainless Steel Properties publication trend

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Technical terms

Martensitic transformation: A diffusionless, rapid change from austenite to martensite upon cooling, producing a hard, supersaturated phase.

Tempering: A heat treatment following quenching in which steel is reheated to a moderate temperature to precipitate carbides, relieve stresses and increase toughness.

Intercritical annealing: Heating within the two-phase region between Ac1 and Ac3 to generate a controlled mixture of austenite and ferrite (or martensite), refining grain size and tuning mechanical properties.

Reverted austenite: Austenite that forms during tempering or ageing from martensite, often enriched in alloying elements and contributing to ductility and impact toughness.

Heat-affected zone (HAZ): The region of base metal adjacent to a weld or clad where microstructure and properties are altered solely by thermal cycles.

Transformation-induced plasticity (TRIP): Enhanced ductility arising from stress- or strain-driven transformation of retained or reverted austenite to martensite during deformation.

References

1. Multiscale in-situ studies of strain-induced martensite formation in inter-critically annealed extra-low-carbon martensitic stainless steel. Acta Materialia (2021).
2. Pulsed FCAW of Martensitic Stainless Clads onto Mild Steel: Microstructure, Hardness, and Residual Stresses. Materials (2022).
3. Effect of intercritical annealing on the microstructure and mechanical properties of a PH 13-8 Mo maraging steel. Materials Science and Engineering A (2024).