Memoirs of the Faculty of Engineering, Yamaguchi University

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Memoirs of the Faculty of Engineering, Yamaguchi University Volume 32 Issue 1
published_at 1981

Grain Size Distribution and the Related Plastic Flow in Engineering Metallic Materials

Takimoto Akio
Touge Mutsumi
Yamaguchi Morie
Nai Masami
Yoshimura Shigemitsu
Tochino Takafumi
716 KB
The distribution functions of grain sizes are determined for engineering sheet materials of 6-4 brass, copper, SS-41 and aluminum with a sufficient accuracy. Statistical variables of a mode, a median and a standard deviation are determined in addition to a mean. Flow stress is found not necessarily to obey the Hall-Petch relationship in all ranges of plastic strain and the mean grain size employed here except the results in 6-4 brass. The strain hardening exponent (n) increases in a parabolic way as the mean grain diameter increases. The dependence of strength and ductility on the strain rate is shown and the n-value increases as the strain rate increases in SS-41. Variation of the n-value with respect to the width to thickness ratio of a specimen is also discussed for copper.