日本金属学会誌

J. Japan Inst. Metals, Vol. 16, No. 3 (1952),
pp. 128-132

On the Change of the Modulus of Rigidity in Metals caused by Cold Drawing and Annealing

Hiroshi Yamamoto and Hideo Takei


Abstract:

The present experiment has been carried out to ascertain the effect of the cold drawing or annealing on the modulus of rigidity of α-brass and mild steel wires, and at the same time the electric resistance was measured. For this purpose, we made use of the methods of torsion pendulum and potentiometer.
The results obtained are as follows: (1) So far as the reduction of area is less than about 30%, the modulus of rigidity of α-brass wire gradually decreases with the increase of the degree of cold drawing, but after the decrease it gradually rises with the degree of cold drawing. (2)Two remarkable parts are found in the form of the curves of the modulus of rigidity of the cold drawn brass wires as the function of the annealing temperature. The first part is the small peak (or similar phenomenon) of the modulus of rigidity at low temperature 100∼200°, and the second, the large peak at 300∼450°. (3) This phenomenon coincides well with the change of the electric resistance in α-brass wires of high degree of cold drawing. (4) In the α-brass wires of lower degree of cold drawing, such as 12%, 22% and 33% reduction of area,the modulus of rigidity is more sensible for recovery and recrystallization than electric resistance. Though the change of rigidity by annealing is remarkable,that of the electric resistance is very small. (5) In a mild steel the change of rigidity by cold drawing is more complex, and the modulus of rigidity of cold drawn mild steel can be improved by short time annealing at 300∼500°.


(Received 1951/10/21)

Keywords:


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.