高Mn鉄合金多結晶におけるγ\ ightleftarrowsεマルテンサイト変態に及ぼす外力とひずみの影響

DOI Web Site Web Site 被引用文献3件
  • 友田 陽
    茨城大学工学部金属工学科
  • 朴 敏
    茨城大学大学院生，現在：筑波大学大学院生（本籍：ハルビン工業大学）
  • 蓮沼 孝
    茨城大学学生
  • 木村 好里
    茨城大学学生，現在：北海道大学大学院生

書誌事項

タイトル別名
  • Effects of Applied Stress and Plastic Strain on γ\ ightleftarrowsε Martensitic Transformation in High Mn Alloy Polycrystals
  • 高Mn鉄合金多結晶におけるγ〓εマルテンサイト変態に及ぼす外力とひずみの影響
  • コウ Mn テツ ゴウキン タケッショウ ニ オケル ガンマイプシロン マルテ
  • Effects of Applied Stress and Plastic Strain on γ\ ightleftarrowsε Martensitic Transformation in High Mn Alloy Polycrystals

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抄録

Austenite (γ: fcc)→epsilon (ε: hcp) martensitic transformation behaviour in Fe-16 wt%Mn, Fe-24 wt%Mn, and Fe-24 wt%Mn-6 wt%Si alloys has been studied to clarify the influences of plastic strain and applied stress.<BR>Microstructures of as-quenched specimens in these alloys consist of γ and ε. The specimens were heated up to 673 K above the Af temperature and then cooled to a test temperature at which the tension test was carried out. Positive temperature dependence was found under the 0.2% proof stress due to the stress-induced γ→ε transformation in each of the Fe-Mn alloys and the Fe-24Mn-6Si alloy. Extremely low yield strength and high work hardening were observed in the beginning of deformation due to the γ→ε martensitic transformation, when deformation was given at room temperature in the Fe-24Mn alloy in which the γ phase was stabilized by ten times that of cyclic transformations.<BR>The change in the length of the specimens was measured during cooling from 673 K under a constant tensile stress. When the applied stress was larger than the yield strength at 673 K, a rapid elongation in the tensile direction was observed from a temperature between As and Ms. This is ascribed to a preferential transformation shear, i.e. the movement of Schockley partial dislocation caused by a linked effect of the plastic strain at 673 K and the applied stress. The change in the specimen length vs. temperature curve showed a slightly different trend between the Fe-Mn alloys and the Fe-24Mn-6Si alloy. Furthermore, a remarkable shape recovery due to the ε→γ reverse transformation was observed in the Fe-24Mn-6Si alloy but scarcely in the Fe-16Mn and Fe-24Mn alloys, when the elongated specimens were again heated above Af under an applied stress of 2 MPa. The solid-solution hardening by Si appears to be responsible for the observed refinement of the shape memory effect.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 54 (6), 628-634, 1990

    公益社団法人 日本金属学会

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