Effect of chemical composition on service life of heat-resistant steel
There are quite a number of chemical elements that can affect the service life of heat-resistant steel. These effects are manifested in enhancing the stability of the structure, preventing oxidation, forming and stabilizing austenite, anti-corrosion and other aspects, such as rare earth elements as trace elements in heat-resistant steel can significantly improve the oxidation resistance of steel and change thermoplasticity. The basic materials of heat-resistant steels and alloys are generally selected metals and alloys with relatively high melting point, large self-diffusion activation energy or low stacking fault energy. In various heat-resistant steels and superalloys, the requirements for smelting processes are very high, because once the steel is mixed with debris or certain metallurgical defects, the durable strength limit of the material will be reduced. Therefore, the study of the effect of chemical substances is also of far-reaching significance.
