Creep Behavior of Heat-Resistant Steels in Power Plant Applications
Summary
Heat‐resistant steels employed in power plants must withstand sustained mechanical loads at elevated temperatures over extended service lives. Creep—the time‐dependent plastic deformation under constant stress—dictates component design, maintenance intervals and plant availability. Martensitic 9–12 % chromium steels dominate applications up to around 650 °C, while nickel‐based alloys serve the hottest sections in ultra‐supercritical systems. Creep deformation arises from dislocation climb, diffusional flow and grain boundary sliding, all influenced by precipitate stability, grain boundary character and alloy chemistry. Precipitates such as M23C6 carbides and Laves phase particles pin dislocations and retard boundary migration, but coarsening or heterogeneous formation can degrade strength. Control of thermo‐mechanical processing, heat treatment and alloying additions is therefore critical to balance creep strength, toughness and fabricability. Advances in microstructural characterisation and modelling offer pathways to extend service life, improve plant efficiency and reduce downtime, with global implications for emissions reduction and energy security.
Research from Nature Portfolio
Detailed microstructural investigations of a popular high‐Cr creep‐resistant steel have revealed the mechanisms governing M23C6 carbide coarsening during long‐term ageing at service temperatures. Combining transmission and scanning electron microscopy with electron backscatter diffraction, researchers identified preferred sites for carbide growth and quantified boundary‐migration processes. An orientational relationship between the carbides and ferritic matrix was established, clarifying why certain grain‐boundary configurations accelerate coarsening. Insights from this work enable more precise alloy and heat‐treatment designs to optimise carbide distribution for enhanced creep performance.
Creep Behavior of Heat-Resistant Steels in Power Plant Applications publication trend
The graph below shows the total number of articles in creep behavior of heat-resistant steels in power plant applications across all publications each year (not limited to Nature Index journals).
Technical terms
Creep: Time‐dependent plastic deformation of a material under a constant load at elevated temperature.
Martensitic steel: A class of heat‐resistant steels hardened by a martensitic transformation, typically containing chromium and molybdenum.
Creep‐rupture strength: The stress level at which a material fails by creep after a specified time at temperature.
Laves phase: A brittle intermetallic compound rich in elements such as W, Mo, Cr and Si that can precipitate during high‐temperature service.
M23C6 carbides: Chromium‐rich precipitates (where M represents metal elements) that form along grain boundaries and contribute to creep resistance.
References
- The influence of coupling effect between stress and high temperature on the degradation of microstructure and hardness in P91 steel. Materials & Design (2024).
- Creep-induced heterogeneous precipitation of Laves phase with two morphologies in tempered martensite ferritic steels. Materials Research Letters (2023).
- Research and Development of Heat-Resistant Materials for Advanced USC Power Plants with Steam Temperatures of 700 °C and Above. Engineering (2015).
- Coarsening behaviour of M23C6 carbides in creep-resistant steel exposed to high temperatures. Scientific Reports (2016).
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.