Heat-resistant Cast Iron Room Temperature and High Temperature Short-time Mechanical Property
Heat-resistant cast iron is a kind of high-temperature resistant material commonly used in high-temperature applications, such as hot water boilers and gas engines. Heat-resistant cast iron has good thermal conductivity and heat-resistant performance. It can be used in high temperature environments above 500 degree Celsius.
Room temperature mechanical properties of heat-resistant cast iron include tensile strength, yield strength and strain hardening exponent. It is found that tensile strength increased with the increase of alloy content, and the alloy content had great influence on the tensile strength of the cast iron. The yield strength was basically the same, no matter how much the alloy content was. It can be inferred that the addition of alloy would improve the tensile strength but not the yield strength. The strain hardening exponent depended on the content of graphite and was affected by the addition of alloy. Alloying elements could improve the strain hardening factor and make the cast iron resist plastic deformation better.
High temperature mechanical properties of heat-resistant cast iron include creep strain, creep strength, and plastic strain. Creep strain has a certain temperature and time dependence. The shorter the exposure time at a given temperature, the smaller the creep strain. Creep strength would increase with the increase of temperature, and graphite content should be taken into account during the selection of materials. Plastic strain was caused by the internal crystal grain structure of cast iron and was closely related to the graphite content in the cast iron. Under the same temperature, the higher the graphite content, the larger the plastic strain.
The mechanical properties of heat-resistant cast iron would be affected by not only the alloy content but also the temperature and time. Therefore, it is necessary to select the materials and determine the operating conditions for different application environment to ensure the service life and safe operation of the system.
In conclusion, heat-resistant cast iron has high thermal conductivity and heat-resistant performance, and changed mechanical performance at room temperature and high temperature. In order to ensure the service life and safe operation of the system, it is necessary to select the materials and determine the operating conditions for different application environment.
