鋼の低温度脆性及び燒鈍鋼の急冷脆性

概要

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Part I. The Brittlenss of Steels at Sub-Zero Temperatures : The brittleness of steels at sub-zero temperatures was investigated as to plain carbon and several alloy steels in their various heat treated conditions. In the test, the Charpy impact test-pieces were dipped in Duwer's vessel being kept at various low temperatures by means of ether and dry ice. The writers' view on the brittleness is that it is not the characteristic of α-iron itself, but due to the presence of foreign substance and internal stress in it. Part II. Rapid Colling Brittleness of Annealed Steel : - Annealed low carbon steels show an extreme brittleness if they are rapidly cooled from the temperatures close to and under the critical point. The effect is equally observable down to 500°with decreasing magnitude. This brittleness shall hereafter be called as "Rapid Cooling Brittleness of Annealed Steel" In this investigation, various characteristics of the brittleness were shown and made clear the nature of the phenomenon. The brittleness is due to the precipitation hardening of cementite at room temperature.
社団法人日本鉄鋼協会の論文
1935-11-25