Titanium in heat-resistant steel

Effect of titanium

When titanium is used in small quantities (up to 0.3%), the long-term strength of heat-resistant steels is improved. Plasticity of complex alloyed heat-resistant steels, on the contrary, is achieved by the introduction of large amounts of titanium. In this case, titanium interacts with carbon to form strong carbide bonds that do not take part in dispersion hardening processes. Therefore, if during the formation of vanadium and chromium carbides the ratio of titanium to carbon exceeds the value of 5:1, there is a decrease in hardness and strength characteristics of heat-resistant steels. And this process occurs not only at high temperature, but also at room temperature.

At the same time the process of dispersion hardening with the participation of titanium in heat-resistant alloys with intermetallide hardening on the basis of y-solid solution leads to the formation of y'-phase and a significant increase in the heat resistance of austenitic steels. titanium has a temperature-variable solubility. Therefore, the kinetics of formation of the y'-phase depends directly on the level of chromium and other alloying elements, which are formed during the aging of the pre-hardening to a solid solution alloy.

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