The effects of the dynamic strain ageing(DSA)and dynamic annealing(DA)on the mechanical properties of a H68 brass and 20CrMnTi steel were investigated by the experiment in which the temperature were between 300k and 1100k with 10μm grain size and strain rates between 1.1×10

-2

/s and 1.1×10

-4

/s.The results have shown that uniform elongation and work hardening parameters of H68 have a peak value in a temperature region

while that of 20CrMnTi have peak values both in high and low temperature regions respectively

Another result is that DSA and DA phenomena can be found simultaneously if it is close to the critical temperature.Therefore it is suggested that the influnces of these two phenomena should be considered when the processing is carried out at the intermediate temperature.