アルミキルド鋼の低温域における衝撃特性

概要

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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 temperature range from -70℃ to 20℃. 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℃ to -40℃ appeared for specimens of the depth under notch, h=2∿4mm, regardless of their width. (3) The shear fracture appearance of the specimens of 10mm in width showed the tendency of a little increase when the depth under notch decreased from 8mm to 4mm, but its precise measurement was impossible for specimens of the depth under notch of 2mm. (4) Describing here the absorbed energy by E=Ch^mW^n, 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℃ to 20℃ for transverse specimens and that range seemed to correspond to the temperature range of _υT_<γs>. 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.
社団法人溶接学会の論文
1978-01-05