日本金属学会誌

J. Japan Inst. Metals, Vol. 16, No. 7 (1952),
pp. 396-400

On the Tensile Properties of Zinc Sheets. Tested at Various Pulling Speeds. (Mainly, Relating to Annealing Treatment.)

Rihei Kawachi and Kiyoshi Shinoda


Abstract:

It has been known that the variation of tensile properties depending on the pulling speed was great for rolled zinc sheet but small for annealed one, i.e., the former was superior in tensile strength and inferior in elongation to that of the latter when tested at low pulling speed while such superiority or inferiority was reversed at high pulling speed.
To confirm this abnormal phenomenon in detail, tensile properties of the alloys quoted below were tested at the rate of tension of 1 ∼ 140 mm/min after various annealing treatments.
(a) highly cold rolled zinc sheets containing 0.6 pct lead. (b) zinc-lead (0 ∼ 1.14 pct) alloys sheets of which cold reductions were 0 ∼ 70 pct. (c) highly cold rolled zinc alloy containing small amount of lead and manganese.
The results obtained were as follows:
(i) the abnormality above mentioned was clearly shown in alloy (a), but not so clear in (b) and not recognized in (c).
(ii) it was shown that degree of the variation of tensile properties depending on the rate of tension became smaller with proceeding the recrystallization of specimens.
(iii) the specimens of alloy (c) annealed at 200 ∼ 325°C showed the hardening phenomenon when tested at the rate of tension of 1 ∼ 100 mm/min, the temperature at which the max strength was obtained was decreased with increasing rate of tension. And at the rate of tension of 140 mm/min. Such increase of strength was disappeared.
To clarify such abnormal phenomena it was suggested that further researches into rolling schedule, reducing amounts or the effect of testing temperature must be done.


(Received 1952/4/5)

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