Abstract
20Mn2SiCrMo bainitic steel was subjected to tempering at 300 °C and 600 °C for 120 min, respectively, and following microstructure evolution and softening behaviors during thermal fatigue were studied. Experimental results show that 300 °C-tempered samples show a better strength and toughness match. However, a sharp hardness softening for 300 °C during the afterward thermal cycles demonstrates absolutely different hardness stability from the 600 °C. The phenomenon has been ascribed to retained austenite decomposition and carbide precipitation. The present study highlights the importance of structural stability in terms of service environment in pursuing higher thermal cycle softening resistance.
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