高Mn鋼の熱膨張特性におよぼす加工の影響

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  • Effect of Cold Work on Thermal Dilatation Characteristics of Hadfield Steel. (Effect of Heating on Work-Hardened High-Manganese Steel-I)
  • コウMn コウ ノ ネツ ボウチョウ トクセイ ニ オヨボス カコウ ノ エイキョウ

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抄録

Effect of cold working on thermal dilatation characteristics in temperature range up to 350°C of Hadfield steels were studied by differential methods. Thermal dilatation curves of work-hardened steels varied with the working ratio and the working methods. Hammered steel firstly contracted in the temperature range of 80∼180°C and then rapidly expanded at about 200°C in dilatation curves. As the working ratio was raised, these changes became gradually clear. On the contrary, it was found that there were not only a first contraction at about 150°C, but a second contraction at about 230°C in thermal dilatation curves of static-elongated steels. As the elongation increased, especially the second contraction grew gradually. In microstructures of hammered steel, as the working ratio rose, the number of sharp strain markings increased. But, in elongated steel, it appeared that the strain markings were gradually twisted and enlarged in width.

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