Effect of Tempering process on Microstructure and Mechanical Properties of Low Alloyed Cast Steel

摘要

The effect of tempering process on the microstructure and properties of low alloyed caststeel was studied. The results show that tempered at (200~400)°C, the M/A island of the granularbainite decomposes and carbide precipitates. When the tempering temperature rises to (500~600)°C,the M/A island is completely decomposed, and the carbide aggregates and gradually spheroidizes.With the increasing of tempering temperature, the tensile strength increases first and then decreases,elongation and impact energy show a trend of increasing at first, then decreasing and then increasing.The tempering brittleness °Ccurs at 400°C.