碳、錳含量對低碳(錳)鋼過冷奧氏體形變過程中鐵素體形核率的影響

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基金項目:

國家重點基礎研究發展規劃"973"項目(No.G1998061506)國家高技術研究計劃"863"項目(No.2001AA332020)

Ferrite nucleation rate in undercooled austenite during deformation in low carbon (Mn) steels with different C and Mn contents

1. Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650093, China;
3. The State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

摘要: 研究了碳、錳含量對低碳(錳)鋼形變強化鐵素體晶粒數目變化的影響.結果表明,形變使低碳(錳)鋼過冷奧氏體內部形核位置增加,鐵素體形核率顯著提高,晶粒大大細化.碳、錳含量提高有利于鋼中過冷奧氏體累積變形的增加,形變強化相變晶粒細化能力增強,而碳的促進作用尤為顯著.
- 低碳(錳)鋼 /
- 形變強化相變 /
- 形核率 /
- 晶粒細化
Abstract: The effect of C and Mn contents on ferrite nucleation rate during Deformation-Enhanced Ferrite Transformation (DEFT) in low carbon (Mn) steels was investigated. The results show that the deformation causes such a higher defect density in austenite grains, which leads to extra sites for nucleation both at the austenite boundaries and intragranular, that ferrite grains are refined dramatically. The addition of C or Mn is favored to strain cumulated in the austenite, which also increases the nucleation sites, resulting in more pronounced ferrite grains refined. The promotive ability of C to refine ferrite grains is, however, much greater than that of Mn.
- low carbon (Mn) steel /
- DEFT /
- nucleation rate /
- grain refinement