Fe-22Mn-0.7CTWIP鋼的熱塑性與斷裂機制

蘭鵬; 唐海燕; 紀元; 杜辰偉; 張家泉

doi:10.13374/j.issn2095-9389.2016.06.008

Fe-22Mn-0.7CTWIP鋼的熱塑性與斷裂機制

doi: 10.13374/j.issn2095-9389.2016.06.008

蘭鵬^1,2, ,,
唐海燕^1,2,
紀元^1,2,
杜辰偉^1,2,
張家泉^1,2

1. 北京科技大學冶金與生態工程學院, 北京 100083;
2. 北京科技大學鋼鐵冶金新技術國家重點實驗室, 北京 100083

基金項目:

中央高校基本科研業務費資助項目(FRF-TP-15-066A)

詳細信息

通訊作者:
蘭鵬,E-mail:lanpeng@ustb.edu.cn

中圖分類號: TG142.7
計量
- 文章訪問數: 346
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- PDF下載量: 14
- 被引次數: 0
出版歷程
- 收稿日期: 2015-06-15
- 網絡出版日期: 2021-07-22

Hot ductility and fracture mechanism of Fe-22Mn-0.7C TWIP steel

LAN Peng^{1,2
, ,},
TANG Hai-yan^1,2,
JI Yuan^1,2,
DU Chen-wei^1,2,
ZHANG Jia-quan^1,2

1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 基于Gleeble-1500熱力模擬試驗機測定了Fe-22Mn-0.7C TWIP鋼和Q235鋼700~1300℃范圍內的靜態拉伸行為.采用光學顯微鏡、掃描電子顯微鏡、能譜儀、電子探針微區分析等技術表征兩鋼種不同溫度下的變形特征和斷口形貌.通過分析基體化學成分、相體積分數、晶粒尺寸、凝固缺陷等因素探討TWIP鋼鑄態熱塑性的變化規律及其影響機制.研究結果表明,Fe-22Mn-0.7C TWIP鋼700~1250℃范圍內的鑄態抗拉強度高于Q235,而其斷面收縮率低于40%,且斷口均以沿枝晶間斷裂方式為主.晶粒細化和控制溶質顯微偏析有利于提高TWIP鋼熱塑性,與基體均質性改善有關.此外,增加應變速率TWIP鋼拉伸強度和斷面收縮率同時增大.
- 錳鋼 /
- 熱塑性 /
- 斷裂機制 /
- 裂紋 /
- 連鑄
Abstract: The static tensile behaviors of Fe-22Mn-0.7C TWIP steel and Q235 steel between 700 ℃ and 1300 ℃ were investigated by Gleeble-1500 thermo-mechanical simulator.The microstructure characteristic and fracture morphology were observed by optical microscopy,scanning electron microscopy,energy dispersive spectrometry and electron probe micro-analysis.The hot ductility and influenced mechanism were revealed based on the discussion of chemical composition,matrix phase volume fraction,grain size and solidification defects.It is found that the TWIP steel has a reduction in area lower than 40% in the temperature range of 700 ℃ to 1250 ℃,but its tensile strength is higher than that of Q235 steel.Fractographic results manifest intergranular fracture for the TWIP steel.Grain refinement and microsegregation descending in the TWIP steel are beneficial to increasing the hot ductility due to the improvement of matrix homogeneity.Besides,the tensile strength and reduction in area of the TWIP steel increase with increasing strain rate.
- manganese steel /
- hot ductility /
- fracture mechanisms /
- cracks /
- continuous casting