工程科学学报，第39卷，第4期：520528,2017年4月 Chinese Journal of Engineering,Vol.39,No.4:520-528,April 2017 DOI:10.13374/j.issn2095-9389.2017.04.006:http://journals.ustb.edu.cn 钛和钒对高锰钢高温热延性的影响 刘洪波”，刘建华)区，丁浩)，吴博威”，张杰”，苏晓峰2》 1)北京科技大学工程技术研究院，北京1000832)河北辛集澳森钢铁有限公司技术中心，辛集052360 ☒通信作者，E-mail:liujianhua(@metall.usth.edu.cn 摘要运用Gleeble-3500热力模拟试验机对700~1200℃温度范围内高锰钢Mnl3单独加入钛（质量分数0.10%）、复合添 加钛（质量分数0.11%）和钒（质量分数0.20%）后的高温热延性进行测试.采用扫描电镜和X射线能谱分析仪对不同温度 下拉伸断裂后试样的断口形貌以及断口处的析出粒子进行了分析.温度一断面收缩率曲线表明在高锰钢中加入0.10%钛后， 其断面收缩率出现了一定程度的下降，这表明钛的加入恶化了高锰钢的热延性：在此基础上加入0.20%钒，高锰钢的热延性 出现了进一步的下降，即钛和钒的复合加入严重恶化了高锰钢的热延性.利用Thermo-Cale热力学计算软件对单独含钛以及 复合含钛钒的高锰钢在700~1600℃存在的平衡析出相进行了计算，计算结果表明Ti(C,N)的平衡析出温度均约为1499℃， 远大于其液相线温度，这说明T(C,N)在高锰钢的液相中就可以开始析出.扫描电镜一能谱分析结果表明在奥氏体晶界以及 三叉晶界处存在大量的Ti(C,N)和(Ti,V)C粒子，这些粒子的出现抑制了动态再结品的发生，并且加速了晶界附近裂纹的 扩展。 关键词锰钢：拉伸实验：热延性：钒：钛：动态再结晶 分类号TG142.1·3 Influence of Ti and V on the hot ductility of high manganese austenitic steel LIU Hong-bo,LIU Jian-hua,DING Hao,WU Bo-wei,ZHANG Jie,SU Xiao-feng 1)Institute of Engineering Technology,University of Science and Technology Beijing,Beijing 100083,China 2)Technical Center,Aosen Steel Co.Ltd.Xinji 052360,China Corresponding author,E-mail:liujianhua@metall.ustb.edu.cn 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-east high manganese austenitic steels were studied using a Gleeble-3500 thermo-mechanical simula- tor over a temperature range of 700 to 1200 C.Fracture surfaces and particles precipitated at different testing temperatures were inves- tigated via scanning electron microscopy (SEM)and X-ray energy dispersive spectrometry (EDS).The hot ductility curves as a func- tion 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 1600C were calculated via Thermo-Cale commercial software.The calculation results show that Ti(C,N)in Ti-bearing high- Mn steel precipitates at 1499 C,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 bound- aries. KEY WORDS manganese steels;tensile tests;hot ductility;vanadium;titanium:dynamic recrystallization 收稿日期：2016-07-07 基金项目：国家自然科学基金资助项目(51574022)工程科学学报，第 39 卷，第 4 期: 520--528，2017 年 4 月 Chinese Journal of Engineering，Vol． 39，No． 4: 520--528，April 2017 DOI: 10． 13374 /j． issn2095--9389． 2017． 04． 006; http: / /journals． ustb． edu． cn 钛和钒对高锰钢高温热延性的影响 刘洪波1) ，刘建华1) ，丁 浩1) ，吴博威1) ，张 杰1) ，苏晓峰1，2) 1) 北京科技大学工程技术研究院，北京 100083 2) 河北辛集澳森钢铁有限公司技术中心，辛集 052360 通信作者，E-mail: liujianhua@ metall． ustb． edu． cn 摘 要 运用 Gleeble-3500 热力模拟试验机对 700 ～ 1200 ℃温度范围内高锰钢 Mn13 单独加入钛( 质量分数 0. 10% ) 、复合添 加钛( 质量分数 0. 11% ) 和钒( 质量分数 0. 20% ) 后的高温热延性进行测试． 采用扫描电镜和 X 射线能谱分析仪对不同温度 下拉伸断裂后试样的断口形貌以及断口处的析出粒子进行了分析． 温度--断面收缩率曲线表明在高锰钢中加入 0. 10% 钛后， 其断面收缩率出现了一定程度的下降，这表明钛的加入恶化了高锰钢的热延性; 在此基础上加入 0. 20% 钒，高锰钢的热延性 出现了进一步的下降，即钛和钒的复合加入严重恶化了高锰钢的热延性． 利用 Thermo--Calc 热力学计算软件对单独含钛以及 复合含钛钒的高锰钢在 700 ～ 1600 ℃存在的平衡析出相进行了计算，计算结果表明 Ti( C，N) 的平衡析出温度均约为 1499 ℃， 远大于其液相线温度，这说明 Ti( C，N) 在高锰钢的液相中就可以开始析出． 扫描电镜--能谱分析结果表明在奥氏体晶界以及 三叉晶界处存在大量的 Ti( C，N) 和( Ti，V) C 粒子，这些粒子的出现抑制了动态再结晶的发生，并且加速了晶界附近裂纹的 扩展． 关键词 锰钢; 拉伸实验; 热延性; 钒; 钛; 动态再结晶 分类号 TG142. 1 + 3 收稿日期: 2016--07--07 基金项目: 国家自然科学基金资助项目( 51574022) Influence of Ti and V on the hot ductility of high manganese austenitic steel LIU Hong-bo1) ，LIU Jian-hua1)  ，DING Hao1) ，WU Bo-wei1) ，ZHANG Jie1) ，SU Xiao-feng1，2) 1) Institute of Engineering Technology，University of Science and Technology Beijing，Beijing 100083，China 2) Technical Center，Aosen Steel Co． Ltd． ，Xinji 052360，China  Corresponding author，E-mail: liujianhua@ metall． ustb． edu． cn 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 simula￾tor over a temperature range of 700 to 1200 ℃ ． Fracture surfaces and particles precipitated at different testing temperatures were inves￾tigated via scanning electron microscopy ( SEM) and X-ray energy dispersive spectrometry ( EDS) ． The hot ductility curves as a func￾tion 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 high￾Mn 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 bound￾aries． KEY WOＲDS manganese steels; tensile tests; hot ductility; vanadium; titanium; dynamic recrystallization