Molybdenum in heat-resistant steel
Effect of molybdenum
The use of molybdenum for alloying ferritic, austenitic steels and nickel alloys retards the softening of y-solid solutions and affects the increase in the temperature of their recrystallization. In this case, the more molybdenum is introduced into the alloy, the greater becomes the activation energy of chromium and self-diffusion of iron. In addition, both short-term and long-term tests have shown that an increase in the heat resistance when alloyed with molybdenum increases the ductility of the alloys. This element also has a much greater effect on the increase in the heat resistance of dispersive hardening alloys, hardened by intermetallic compounds or carbide.
An increase in the effectiveness of the action of molybdenum on the heat-resistant properties of complex alloy steels can be achieved by the simultaneous introduction into the alloy of several elements, including those that cause precipitation hardening. In this case, the diffuse exchange, the recrystallization and coagulation of dispersed particles are difficult, which at high temperatures allows the alloy to soften by the use of molybdenum. Therefore, in the graph, alloys doped with molybdenum have higher hardness values than others.
It should be noted that molybdenum slightly affects the mechanical properties of the alloy, as well as the parameter of absolute increase in hardness at room temperature. Only a small displacement of the maximum hardness of dispersion hardening occurs. And then, only if the operating temperature rises.
Molybdenum also has a positive effect on nickel and iron heat-resistant alloys strengthened by intermetallic compounds. Molybdenum is capable of forming phases like Laves, which, due to the processes of dispersion hardening, further increase the heat resistance of alloys.
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