Computational Methods and Experiments in Materials Characterisation III
Experimental and Computational Material Characterisation ... · Experimental and Computational...
Transcript of Experimental and Computational Material Characterisation ... · Experimental and Computational...
Eimear O’Hara
Experimental and Computational Material
Characterisation for High Efficiency,
High Flexibility Power Generation
Nano-Scale Design of Power Plant Materials
Increased energy sustainability
Improved flexibility &
reduced emissions
Next generation power plants
Higher temperatures
& pressures
𝜂 = 1 −𝑇𝑙𝑇𝑢
Nano-scale design of materials
Key challenge: Thermo-mechanical fatigue of nano-strengthened materials
Material 𝑇𝑢 (°C) 𝜂 (%)
Current 480 °C 61 %
MarBN 650 °C 68 %
Martensite
Lath
Abe, F. et al., “Advances in Materials Technology for Fossil Power Plants, 2007.
Oruganti, R. et al., Acta Matl, 2011.
40
100 1,000 10,000 100,000 1,000,000
Stre
ss (
MP
a)
Rupture time (hours)
MarBN
Current Materials
200
160
120
80
High Temperature Fatigue of MarBNStrain-Rate Effect
Cyclic Softening
Cyclic Strength
Secondary
cracking
Strain-Life CurvesInclusions
Fatigue
striations
Unified Viscoplasticity Fatigue DesignStress Relaxation
Strain-Rate Strain-Range Multi-scale material design
for next generation welded
connections in MarBN