鈦和釩對高錳鋼高溫熱延性的影響

劉洪波; 劉建華; 丁浩; 吳博威; 張杰; 蘇曉峰

doi:10.13374/j.issn2095-9389.2017.04.006

鈦和釩對高錳鋼高溫熱延性的影響

doi: 10.13374/j.issn2095-9389.2017.04.006

劉洪波¹,
劉建華^1, ,,
丁浩¹,
吳博威¹,
張杰¹,
蘇曉峰^1,2

1) 北京科技大學工程技術研究院, 北京 100083
2) 河北辛集澳森鋼鐵有限公司技術中心, 辛集 052360

基金項目:

國家自然科學基金資助項目(51574022)

詳細信息

中圖分類號: TG142.1⁺3
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- 被引次數: 0
出版歷程
- 收稿日期: 2016-07-07

Influence of Ti and V on the hot ductility of high manganese austenitic steel

1) Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
2) Technical Center, Aosen Steel Co. Ltd., Xinji 052360, China

摘要

摘要: 運用Gleeble-3500熱力模擬試驗機對700~1200℃溫度范圍內高錳鋼Mn13單獨加入鈦(質量分數0.10%)、復合添加鈦(質量分數0.11%)和釩(質量分數0.20%)后的高溫熱延性進行測試.采用掃描電鏡和X射線能譜分析儀對不同溫度下拉伸斷裂后試樣的斷口形貌以及斷口處的析出粒子進行了分析.溫度-斷面收縮率曲線表明在高錳鋼中加入0.10%鈦后,其斷面收縮率出現了一定程度的下降,這表明鈦的加入惡化了高錳鋼的熱延性;在此基礎上加入0.20%釩,高錳鋼的熱延性出現了進一步的下降,即鈦和釩的復合加入嚴重惡化了高錳鋼的熱延性.利用Thermo-Calc熱力學計算軟件對單獨含鈦以及復合含鈦釩的高錳鋼在700~1600℃存在的平衡析出相進行了計算,計算結果表明Ti (C,N)的平衡析出溫度均約為1499℃,遠大于其液相線溫度,這說明Ti (C,N)在高錳鋼的液相中就可以開始析出.掃描電鏡-能譜分析結果表明在奧氏體晶界以及三叉晶界處存在大量的Ti (C,N)和(Ti,V) C粒子,這些粒子的出現抑制了動態再結晶的發生,并且加速了晶界附近裂紋的擴展.
- 錳鋼 /
- 拉伸實驗 /
- 熱延性 /
- 釩 /
- 鈦 /
- 動態再結晶
Abstract: The influence of Ti (mass fraction 0.10%) and the joint additions of Ti (mass fraction 0.11%) and V (mass fraction 0.20%) on the hot ductility of as-cast high manganese austenitic steels were studied using a Gleeble-3500 thermo-mechanical simulator over a temperature range of 700 to 1200℃. Fracture surfaces and particles precipitated at different testing temperatures were investigated via scanning electron microscopy (SEM) and X-ray energy dispersive spectrometry (EDS). The hot ductility curves as a function of temperature of high-Mn austenitic steels showed that Ti addition leads to loss of ductility in almost the entire testing temperature range. Moreover, the joint additions of Ti and V do not exhibit any improvement in the hot ductility, resulting in relatively poor hot ductility behavior. The phase diagrams of precipitates in Ti-and Ti-V-bearing high-Mn austenitic steels in the temperature range of 700 to 1600℃ were calculated via Thermo-Calc commercial software. The calculation results show that Ti(C,N) in Ti-bearing highMn steel precipitates at 1499℃, which is much higher than its liquidus temperature. This illustrates that Ti(C,N) particles form in the liquid steel. SEM-EDS results show that Ti(C,N) and (Ti,V) C particles form along the austenitic grain boundaries and the triple junction. These particles retard the occurrence of dynamic recrystallization and accelerate the extension of cracks near the grain boundaries.
- manganese steels /
- tensile tests /
- hot ductility /
- vanadium /
- titanium /
- dynamic recrystallization

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