Effect of pulsed electric heating local deformation mode on structure of blanks made of titanium VT6S alloy

The local deformation process of blanks in the form of thin discs made of titanium VT6S alloy with the use of pulse heating with electric current without and with deformation in heated state in the electrodes of the point contact welding machine is studied. It is established that when heated without deformation, increase in the temperature of heating contributes to the growth of grain in the blank. Intense grain growth is noted at heat temperature above 750...800 °C. Intensive plastic deformation due to the compression of the blank heated area by the electrodes of the contact machine is accompanied by the formation of double layers and decrease in the size of the grain after deformation and artificial ageing.

Structure of sheet blanks from VT6S titanium alloy after local deformation during pulse heating by electric current

The local deformation process of blanks in the form of thin discs from VT6S titanium alloy with the use of pulse heating by electric current and deformation in heated state in the electrodes of the point contact welding machine is studied. The rational values of the process parameters (pulse current, pulse duration and precipitation force) are defi ned. Analysis of the microstructure for the VT6S alloy in its original state and after deformation with heating did not reveal signifi cant increase in grain and the formation of thick alpha layer. The increasing in the plasticity of the VT6S alloy after passing of the current pulse is established. At the same time, in the structure of the deformed zone noted the presence of double.

Heightening Design and Construction of the Reinforcement Concrete Chimney in Heated State

This paper introduced a project of reinforced concrete chimney with a height of 90 meters, which does not stop construction at nearly 200 degree Celsius, increased the height of the chimney with 10 meters. Reasonable structural measures were promoted to ensure the normal pouring of concrete chimneys. Compared with the normal condition, this measure is economical, low investment, feasible, etc. It provides far-reaching significance that increasing the height of the reinforced concrete chimney at the high temperature state.

On an easier mode of procuring potassium than that which is now adopted

The process originally discovered and described by Messrs. Gay-Lussac and Thenard for obtaining potassium by means of iron, requires that the iron should at first be intensely heated, and afterwards that the alkali should be applied to it in the heated state. For this purpose a gun-barrel is required of such a length as to pass through a furnace purposely constructed, having at its extremity a second short portion of barrel neatly fitted to it by grinding, for the purpose of containing the alkali; and from which it may be made to flow by means of a separate fire, to be applied by the attendant operator at such a stage of the process, and at such a rate, as is judged to be most advantageous. Since in this method, though the alkali is, in fact, soon mixed with the iron, the process nevertheless requires the heat to be continued for nearly an hour, the author conceived that nearly the same effect might be produced merely by mixing the same ingredients previously, and distilling them in the following simple apparatus.