摘要
The microstructure, tensile properties, and fracture toughness of 12Cr2Mo1R steel were studied. The results indicate that this steel is characterized by a bainite microstructure, in which several types of carbides precipitate along the ferrite laths. As the temperature increases from room temperature to 375℃ ,the strength of the steel increases slightly and the fracture toughness clearly decreases. However, when the temperature continues to increase up to 500 ℃, the strength decreases and the fracture toughness increases. At all the temperatures investigated,the strength and toughness of the developed 12Cr2Mo1R steel were capable of meeting the design requirements of a high-temperature gas-cooled reactor. The fracture of 12Cr2Mo1R steel at high temperature typically occurs in the ductile mode.
The microstructure, tensile properties, and fracture toughness of 12Cr2Mo1R steel were studied. The results indicate that this steel is characterized by a bainite microstructure, in which several types of carbides precipitate along the ferrite laths. As the temperature increases from room temperature to 375℃ ,the strength of the steel increases slightly and the fracture toughness clearly decreases. However, when the temperature continues to increase up to 500 ℃, the strength decreases and the fracture toughness increases. At all the temperatures investigated,the strength and toughness of the developed 12Cr2Mo1R steel were capable of meeting the design requirements of a high-temperature gas-cooled reactor. The fracture of 12Cr2Mo1R steel at high temperature typically occurs in the ductile mode.
