This analysis reveals changes in microstructure and mechanical properties of martensitic heat resistant steel post-aging, indicating its effects on strength and toughness.
Key Points
Aging treatment at 650°C enhances the microstructure of martensitic heat resistant steel and influences mechanical properties.
Prolonged aging treatment resulted in increased precipitates, improving mechanical properties initially but decreasing tensile strength over time.
Carbide Cr 23 C 6 and carbon nitride MX precipitation contributed positively to high-temperature strength before negatively affecting toughness.
Fracture modes transitioned from brittle cleavage to intergranular fractures as the aging treatment duration increased.