低碳微量鈮鋼過冷奧氏體形變過程中的碳氮化物析出

陳國安; 楊王玥; 郭守真; 孫祖慶

doi:10.13374/j.issn1001-053x.2005.03.012

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驗證碼

低碳微量鈮鋼過冷奧氏體形變過程中的碳氮化物析出

doi: 10.13374/j.issn1001-053x.2005.03.012

1. 北京科技大學材料科學與工程學院, 北京 100083;
2. 新金屬材料國家重點實驗室, 北京 100083

基金項目:

國家自然科學基金(No.50471092)

國家"863"資助項目(No.2001AA332020)

中信鈮鋼資助項目

詳細信息

作者簡介:
陳國安(1979-),男,博士研究生

中圖分類號: TG111.2;TG142.31
計量
- 文章訪問數: 166
- HTML全文瀏覽量: 29
- PDF下載量: 9
- 被引次數: 0
出版歷程
- 收稿日期: 2004-04-07
- 修回日期: 2004-07-09
- 網絡出版日期: 2021-08-17

Carbonitride precipitates during deformation of undercooled austenite in Nb-microalloyed steel

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

摘要

摘要: 利用透射電鏡研究了低碳微量鈮鋼過冷奧氏體形變過程中的碳氮化物析出,運用Gladman晶粒粗化機制討論了析出相顆粒的平均直徑、體積分數和鐵素體晶粒尺寸的關系.實驗結果表明:實驗用鋼中的微量Nb在1200℃時完全固溶,并在760℃變形前的冷卻過程中無Nb(CN)析出.在形變過程中Nb(CN)的析出同樣需要孕育期,但與等溫過程相比大大提前.當變形量積累到一定值(本實驗條件下ε=0.69)時,大量動態析出的Nb(CN)顆粒彌散分布在晶界以及位錯線上.Nb(CN)析出隨著應變量的增加而增加,但顆粒長大不明顯,計算得到的鐵素體晶粒平均截徑與實際測得的鐵素體晶粒吻合得較好.
- Nb(CN)析出 /
- 孕育期 /
- 體積分數 /
- 析出長大
Abstract: By using TEM the strain-induced precipitation of Nb(CN) during deformation of under cooled austenite was investigated in Nb-microalloyed steel. The results showed that at 1200℃ all of Nb were dissolved and there were no Nb(CN) precipitates formed during cooling until down to 760℃. During deformation-enhanced ferrite transformation the Nb(CN) of dynamic precipitation required an incubation period, but compared with isothermal transformation it reduced significantly. Only when the strain increased to 0.69, Nb(CN) began to precipitate on dislocation nodes and grain boundaries. The volume fraction of Nb(CN) precipitates increased with the increase of strain but their coarsening was not significant. It is shown that the measured grain size is in good agreement with the calculated value.
- Nb(CN) precipitates /
- incubation period /
- volume fraction /
- precipitate growth