An Experimental study of the Resistance to plastic Deformation of Hot Rolling Metals

A Can Plastometer Was used to Compress Cylindrical specimens. There are hollows on the cross-section of one end of the specimens and the hollows were filled up with glass powder with various fusion temperatures. A heat keeping device was used to assure uniform and constant temperature during the experiment. The experimental results concern with the resistance to deformation of ten types of steel at elevated temperature and high strain rates. The experimental conditions were as follows:temperature 850-1200℃, Strain rate 5-80S^-1 and reduction up to ln2(e=ln_1h^H).
In this paper the experimental method has been described and influences of temperature of strain rates and of reduction on the resistance to deformation hsave been analysed. By linear and non-linear regression analysis of the exper mental data, a formula for calculating resistance to deformation which may be preferable for either computer-controll model or engeneering practice was recommended.
The formula is:
$\sigma ={\rm{EXP(}}\frac{{{{\rm{U}}_1}}}{{\rm{T}}}{\rm{ + }}{{\rm{U}}_2}{\rm{)\cdot(}}\frac{{\rm{u}}}{{10}}{{\rm{)}}^{{{\rm{U}}_3}{\rm{T + }}{{\rm{U}}_4}}}{\rm{\cdot}}\left({{{\rm{U}}_6}{{(\frac{{\rm{e}}}{{0.4}})}^{{{\rm{U}}_5}}}-({{\rm{U}}_6}-1)\frac{{\rm{e}}}{{0.4}}} \right)$
here:T=$\frac{{{\rm{t}} + 273}}{{1000}}$
U₁-U₆ are coefficients determined by the properties of the experimental steel.