Effect of molybdenum

The use of molybdenum to alloy ferritic, austenitic steels and nickel alloys inhibits the softening of y-hard solutions and increases their recrystallization temperature. In this case, the more molybdenum is introduced into the alloy, the higher is the activation energy of chromium and self-diffusion of iron. In addition, both short-term and long-term tests have shown that the increase in heat resistance in alloying with molybdenum increases the ductility of the alloys. Also, this element has a much greater effect on increasing the heat resistance of dispersion-hardened alloys hardened with intermetallides or carbide.

Increasing the effect of molybdenum on the heat resistance properties of complex alloyed steels can be achieved by the simultaneous introduction of several elements into the alloy, including those that cause dispersion hardening. In this case there is a hindrance of diffusion exchange, recrystallization and coagulation of dispersed particles, which at high temperatures can slow down the hardening of the alloy by introduction of molybdenum. Therefore, on the graph, alloys alloyed with molybdenum have higher hardness values than others.

It should be noted that molybdenum has little effect on the mechanical properties of the alloy, as well as the absolute hardness increase parameter at room temperature. There is only a slight shift in the maximum hardness of the dispersion hardening. And that only if the operating temperature is increased.

Molybdenum also has a positive effect on nickel and iron heat resistant alloys hardened by means of intermetallides. Molybdenum is able to form a phase like Lavez, which by dispersion hardening processes, further increases the heat resistance of the alloys.

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