JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Impact Properties of Al-Killed Steel at Low Temperature Range
Makoto FujiwaraYoshimi Kai
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1978 Volume 47 Issue 1 Pages 26-30

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Abstract

Variation of the absorbed energies and shear fracture appearances associated with the change of the width and the depth under the notch in Charpy impact test were investigated on Al-killed steel in the tem-perature range from -70°C to 20°C. The results obtained are summarized as follows;
(1) The clear transition curve of absorbed energy could not be observed when decreasing the width and the depth under notch of specimens.
(2) The energy peak in the range from -60°C to -40°C appeared for specimens of the depth under notch, h=2-4 mm, regardless of their width.
(3) The shear fracture appearance of the specimens of 10 mm in width showed the tendency of a little in-crease when the depth under notch decreased from 8 mm to 4 mm, but its precise measurement was impossible for specimens of the depth under notch of 2 mm.
(4) Describing here the absorbed energy by E=ChmWn, the exponent m was roughly 1.3-1.6 and showed a little but not remarkable dependence temperature for longitudinal specimens. On the other hand, it decreased sharply in the range from -40°C to 20°C for transverse specimens and that range seemed to correspond to the temperature range of υTrs.
The exponent n was 0.9-1.1 and showed little dependence on the depth under notch and on the test temperature for both longitudinal and transverse specimens.

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