D0L:10.13374/.issn1001-053x.2013.09.022 第35卷第9期 北京科技大学学报 Vol.35 No.9 2013年9月 Journal of University of Science and Technology Beijing Sep.2013 合金元素和工艺参数对热轧TRIP钢动态相变的影 响 李龙飞)☒，尹云洋)，杨王2)，孙祖庆) 1)北京科技大学新金属材料国家重点实验室，北京1000832)北京科技大学材料科学与工程学院，北京100083 ☒通信作者，E-mail:lilf@skl.ustb.edu.cn 摘要利用Gleeble热模拟试验机进行单轴压缩试验，研究了C-Mn-Si TRIP钢和C-Mn-Al-Si TRIP钢过冷奥氏体形 变过程的组织演变，分析了合金元素和工艺参数对过冷奥氏体动态相变的影响.与等温相变相比，C-M-Si钢和C-Mn- A-Si钢动态相变动力学明显加快.与C-Mn-Si钢相比，用质量分数约1%的Al替代Si后，C-Mn-Al-Si钢的A3温度明 显提高，在相同变形工艺条件下C-Mn-A1-Si钢过冷奥氏体动态相变较易发生，而CM-Si钢动态相变得到的铁素体晶 粒比较细小.减小动态相变前奥氏体晶粒尺寸，有利于过冷奥氏体动态相变的进行.提高过冷奥氏体形变时的变形温度 或应变速率均对动态相变产生一定的阻碍作用，但影响不显著 关键词TRP钢：相变：奥氏体：合金元素：晶粒尺寸：压缩试验 分类号TG142.3 Influences of alloying elements and processing parameters on the dy- namic transformation of undercooled austenite in hot-rolled TRIP steels LI Long-fei),YIN Yun-yang2),YANG Wang-yue 2),SUN Zu-qing) 1)State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China 2)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:lilfaskl.ustb.edu.cn ABSTRACT The microstructural evolution of undercooled austenite in C-Mn-Si TRIP steel and C-Mn-Al-Si TRIP steel during hot deformation was investigated by hot uniaxial compression testing on a Gleeble-1500 hot simulator,and the influences of alloying elements and processing parameters on the dynamic transformation of undercooled austenite were analyzed.It is found that the dynamic transformation kinetics of undercooled austenite in C-Mn-Si TRIP steel and C-Mn-Al-Si TRIP steel is faster obviously than the isothermal transformation kinetics of undercooled austenite. In comparison with C-Mn-Si TRIP steel,the As temperature of C-Mn-Al-Si TRIP steel is elevated markedly by the substitution of 1%Al for Si,and the dynamic transformation of undercooled austenite in C-Mn-Al-Si TRIP steel is faster at the same processing conditions.But the averave size of ferrite grains fomred by the dynamic transformation in C-Mn-Si TRIP steel is finer.The refinement of austenite grains before the dynamic transformation is of benefit to the development of the dynamic transformation of undercooled austenite.Increasing the deformation temerature or the strain rate of undercooled austenite during hot deformation has a retarding effect on the dynamic transformation of undercooled austenite.but this effect is not marked. KEY WORDS TRIP steel;phase transitions;austenite;alloying elements;grain size;compression testing 收稿日期：2012-08-04 基金项目：因家高技术研究发展计划资助项目(2007AA03Z501):高等学校博士学科点专项科研基金资助项目(200800081014)第 35 卷 第 9 期 北 京 科 技 大 学 学 报 Vol. 35 No. 9 2013 年 9 月 Journal of University of Science and Technology Beijing Sep. 2013 合金元素和工艺参数对热轧 TRIP 钢动态相变的影 响 李龙飞1) ，尹云洋2)，杨王玥2)，孙祖庆1) 1) 北京科技大学新金属材料国家重点实验室，北京 100083 2) 北京科技大学材料科学与工程学院，北京 100083 通信作者，E-mail: lilf@skl.ustb.edu.cn 摘 要 利用 Gleeble 热模拟试验机进行单轴压缩试验，研究了 C-Mn-Si TRIP 钢和 C-Mn-Al-Si TRIP 钢过冷奥氏体形 变过程的组织演变，分析了合金元素和工艺参数对过冷奥氏体动态相变的影响. 与等温相变相比，C-Mn-Si 钢和 C-Mn￾Al-Si 钢动态相变动力学明显加快. 与 C-Mn-Si 钢相比，用质量分数约 1%的 Al 替代 Si 后，C-Mn-Al-Si 钢的 A3 温度明 显提高，在相同变形工艺条件下 C-Mn-Al-Si 钢过冷奥氏体动态相变较易发生，而 C-Mn-Si 钢动态相变得到的铁素体晶 粒比较细小. 减小动态相变前奥氏体晶粒尺寸，有利于过冷奥氏体动态相变的进行. 提高过冷奥氏体形变时的变形温度 或应变速率均对动态相变产生一定的阻碍作用，但影响不显著. 关键词 TRIP 钢；相变；奥氏体；合金元素；晶粒尺寸；压缩试验 分类号 TG142.3 Influences of alloying elements and processing parameters on the dy￾namic transformation of undercooled austenite in hot-rolled TRIP steels LI Long-fei 1) , YIN Yun-yang 2), YANG Wang-yue 2), SUN Zu-qing 1) 1) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 2) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China Corresponding author, E-mail: lilf@skl.ustb.edu.cn ABSTRACT The microstructural evolution of undercooled austenite in C-Mn-Si TRIP steel and C-Mn-Al-Si TRIP steel during hot deformation was investigated by hot uniaxial compression testing on a Gleeble-1500 hot simulator, and the influences of alloying elements and processing parameters on the dynamic transformation of undercooled austenite were analyzed. It is found that the dynamic transformation kinetics of undercooled austenite in C-Mn-Si TRIP steel and C-Mn-Al-Si TRIP steel is faster obviously than the isothermal transformation kinetics of undercooled austenite. In comparison with C-Mn-Si TRIP steel, the A3 temperature of C-Mn-Al-Si TRIP steel is elevated markedly by the substitution of 1% Al for Si, and the dynamic transformation of undercooled austenite in C-Mn-Al-Si TRIP steel is faster at the same processing conditions. But the averave size of ferrite grains fomred by the dynamic transformation in C-Mn-Si TRIP steel is finer. The refinement of austenite grains before the dynamic transformation is of benefit to the development of the dynamic transformation of undercooled austenite. Increasing the deformation temerature or the strain rate of undercooled austenite during hot deformation has a retarding effect on the dynamic transformation of undercooled austenite, but this effect is not marked. KEY WORDS TRIP steel; phase transitions; austenite; alloying elements; grain size; compression testing 收稿日期：2012–08–04 基金项目：国家高技术研究发展计划资助项目 (2007AA03Z501)；高等学校博士学科点专项科研基金资助项目 (200800081014) DOI:10.13374/j.issn1001-053x.2013.09.022