低炭素鋼のクリープ中の電顕直接観察(<小特集>高温強度小特集)

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It is well known that the creep strength of low carbon steels is affected by N, Mn and Si contents as well as heat treatment. But the mechanism by which these factors affect the creep strength of carbon steels is still somewhat unclarified.The authors made creep rupture tests of low carbon steels with various chemical compositions to study the effect of Al, N and Mn on the creep strength of low carbon steels, and observed the structural changes during the creep by transmission electron microscopy.The behaviour of N during creep was also investigated with the internal friction method and the mechanism by which Al, N and Mn affect the creep strength of low carbon steels was discussed.Results are summarized as follows: (1) Creep rupture strength: (a) Effect of Al: Al addition drastically reduces the creep rupture strength of low carbon steels, but Al not exceeding 0.015% lowered it only moderately. An Al-killed steel with 0.039% Al had the lowest creep rupture strength.(b)Effect of N: A vacuum melted steel with 0.002% N showed the lowest strength only second to the Al-killed steel. The higher the N contents were increased the higher the creep rupture strength rose, but the addition of N exceeding 0.005% had relatively small effect.(c) Effect of Mn: The increase in Mn contents from 0.5% to 1.2% caused small decrease in the creep rupture strength.(d) Effect of Mn-N: When both Mn and N contents simultaneously increased, the creep rupture strength was greatly improved. a steel with 1.23% Mn and 0.02% N showed the highest creep rupture strength among the steels investigated.(2) Transmission electron microscopy: (a) Vacuum melted. low N steel: The cell structure was formed during the creep deformation. The progress of the cell formation was different from one grain to another, from ones in which cells were formed in the primary stage to the others in which cells were not formed until the tertiary stage. The number of grains in which cells were formed increased with the increase in creep strain, and when the specimen ruptured, cells were formed in all the grains.
社団法人日本材料学会の論文
1967-03-15

低炭素鋼のクリープ中の電顕直接観察(<小特集>高温強度小特集)

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