Study on the Relationship between Plastic Deformation and Crystal Grain Change in Warm Forging

온간단조에서의 소성변형과 결정입자 변화와의 관계

  • Published : 1996.02.01


The relationship between plastic deformation and crystal grain change in warm forging processes of SM10C carbon steel is studied. If the carbon steel is deformed at warm forging temperature(about recrystallization range), material properties are changed due to microstructural chanre of the crystal grain and cementite of the internal part. Some experimental values are investigated in terms of the elliptic degree of cementite, the grain size of cementite and ferrite grain size. When plastic deformation proceeds, the elliptic degree of cementite becomes larger and the grain size of cementite particle becomes small. In addition, the size of ferrite grain becomes fines by recrystallization. The elliptic degree of cementite has a considerable effect on formability. The distribution of effective strain in the forging was calculated by the rigid visco-plastic FEM analysis. The effective strain distribution obtained from the FEM simulation is compared with the experimental result, At the level of effective strain 0.3, dynamic recovery and dynamic recrystallization begin and at the level of over 2.5, the organization of material has better internal structure that is suitable for the following cold forming.


Warm Forging;Crystal Grain Change;Thermomechanical Treatment


  1. 塑性と加工 v.23 no.33 鍛造における材質豫測 吉野雄?
  2. Metal handbook
  3. 鋼の加工熱處理の金屬學 牧正志;田村今男
  4. Journal of Materials Processing Technology v.35 Possibilities of Varm Extrusion in Combination with Cold Extrusion Korner;Knodler
  5. 鐵と鋼 v.72 no.10 溫間鍛造의 現狀 鈴木康末(etc.)
  6. 塑性と加工 v.30 no.345 溫間鍛造球狀化に關する實驗的檢討 高橋 涉
  7. Mechanical Behavior of Materials Courtney, T.H.
  8. 塑性の加工 31-348 鍛造加工の變形シミユレ??????;分布の豫測およびその豫測結果と材質との關係 李明哲;重野千年;佐久田 博司;小林 勝
  9. 材料 v.38 no.435 加工熱處理による材質の改善と制御 關口秀夫(etc.)
  10. 鐵と鋼 v.61 no.6 鋼の冷間鍛造性におよばす球狀化效度の效果 井上毅;落田義隆;木下修司
  11. 금속재료의 고온변형 거동, 소성변형 및 가공 오병문;장병록;유현철;김동원(편);이동녕(편)
  12. Mechnical Metallurgy (Third Edition) George E. Diter
  13. Metalforming Altan, T.;OH, S.;Gegel, H.L.
  14. ブレス技術 v.21 no.6 溫間鍛造でよく行なれる溫度範圍はどこか, そしてその溫度お選んだ理由は