TZM Alloy Deformation Resistance Affected By Deformation Temperature

TZM alloy has good mechanical property and high temperature performance, in industry, metallurgical industry, aerospace and other fields has been widely used. But TZM alloy has high deformation temperature, high deformation resistance, and poor low temperature ductility, so during rolling process it is difficult, limiting its application and development in the relevant field. In the rolling process, the deformation resistance is an important criterion to determine the rolling process, and different rolling process the deformation resistance and morphology of alloy is different, so understanding the effects of different rolling parameters on deformation resistance can optimize rolling process, improve the mechanical properties and the application of TZM alloys.

Using powder metallurgy m to produce TZM alloy billet obtained by mixing, pressing and sintering. Putting the billets at -1500 thermal simulator in a vacuum state process rolling thermal simulation test of the alloy billet. The deformation was 50% and the experimental temperature was 1150 ℃, 1200 ℃, 1250 ℃ and 1300 ℃. Besides, the deformation rate is 1s-1, 3s-1 and 5s-1. TZM alloy deformation resistance is related to deformation temperature and deformation rate, and the following will main analyze the relationship between the deformation resistance and deformation temperature.

Under certain deformation rate, deformation resistance increase with the rolling deformation temperature rises. This is because when the deformation temperature increases, metal atoms’ kinetic energy in the alloy increases as well, which decreased the dislocation resistance. In the other hand, space, interstitial atoms and other disadvantages defects also more active, resulting in dynamic softening to reduce flow stress. What’s more, when the deformation temperature increases, there will have a new sliding system which produces on the internal original sliding systems of alloy, to enhance the interoperability of the alloy, reducing the dislocation density, improving alloy’s plastic deformation.

Deformation Temperature Influence Titanium Zirconium Molybdenum Alloy’S Organization Structure

Deformation temperature is one of the important factors affecting the titanium zirconium molybdenum (TZM) alloy organizatiom structure, and changes in the organizational structure of the alloy can also cause changes in their properties. After study the influence of different deformation temperature on TZM alloy found that when the deformation temperature is lower than 1150 ℃, due to the deformation resistance of titanium zirconium molybdenum alloy is large so the cracking becomes serious which can not employ subsequent processing. As the deformation temperature increase, TZM alloy has no cracking phenomenon. Besides, the deformation resistance of TZM alloy decreased and the plasticity increase. When the deformation temperature at range of 1300~1350 ℃, the organizational structure of the alloy is a fibrous elongated grains which are mutually overlapping staggered. Besides, the arrangement between the grains very compact and grain boundaries is straight which has fewer voids. However, if the deformation temperature above 1350 ℃, the grain size of the alloy TZM can cause excessive tissue coarsening. During rolling the alloy will pass through a large thermal deformation, so that the ductility of the alloy to give the corresponding increase, but there is a big internal tissue distortion after deformation. If subsequent processing steps still using higher heating temperature, it is easy to make a crude alloy, reduce performance TZM alloy.