Correlation between the thermodynamic stability of austenite and the shear modulus of polycrystalline steel alloy

摘要

Elastic moduli in steel alloys with different martensitic start temperatures were measured during the cooling cycle by using the ultrasonic pulse sing-around method. Our findings show that the shear modulus governs austenite stability prior to martensitic transformation in polycrystalline steel alloys. A non-linear increase in shear modulus is also observed during the cooling cycle. The correlation between elastic modulus and austenite stability in polycrystalline steel alloys is discussed, and the compatibility of the results obtained in this study with the stability theory analyzed in a single crystal is also discussed.