Effect of Heat Treatment on the Microstructures and Properties of High Chromium Cast Iron

The microstructures of high chromium cast iron after different heat treatments are investigated,and the effects of different heat treatments on the impact toughness and hardness are discussed.The relationship between the microstructures and properties is determined.The microstructures of high chromium cast iron can be observed by optical microscope,and with the help of the rockwell apparatus the hardness can be tested,The impact toughness is measured by impact testing machine.The results show that with the hardening temperature ascension,the hardness of the high chromium cast iron rises first,then fall.And the impact toughness is opposite.High chromium cast iron quenched at 1000℃ and then tempered at 400 ℃ can get good comprehensive mechanical properties.