锻压技术

70Cr3Mo钢动态再结晶临界条件研究

英文标题：Research on critical conditions of dynamic recrystallization for steel 70Cr3Mo

作者：陈拂晓蔡志伟王园园王宏波翟增高

分类号：TG142.3

出版年,卷(期):页码：2015,40(11):107-111

摘要：

采用Gleeble-1500D热模拟实验机对70Cr3Mo钢进行热模拟压缩实验，变形温度为850~1150 ℃，应变速率为0.01~10 s-1，用加工硬化率的方法处理实验数据，再结合lnθ-ε曲线的拐点及-(lnθ)/ε-ε曲线最小值判据，建立70Cr3Mo钢热变形过程中的动态再结晶临界应变模型。研究结果表明：实验条件下，70Cr3Mo钢的lnθ-ε曲线均具有拐点特征，对应的-(lnθ)/ε-ε曲线均出现最小值，该最小值所对应的应变即为临界应变；临界应变随变形温度的降低和应变速率的增加而增大；临界应变预测模型可表示为εc=5.4446×10-2Z0.01878。

The hot simulation compression tests of steel 70Cr3Mo were conducted under conditions of deformation temperature 850-1150 ℃ and strain rate 0.01-10 s-1 by the Gleeble-1500D thermo-simulation test machine. The critical strain model of dynamic recrystallization for steel 70Cr3Mo during hot deformation was established by using the work hardening rate method to analyze experimental data, combined with the inflection point criterion of lnθ-ε curves and the minimum value criterion of -(lnθ)/ε-ε curves. The results show that the lnθ-ε curves of steel 70Cr3Mo have the characteristics of inflection point and the corresponding -(lnθ)/ε-ε curve have the minimum value. Therefore, the critical state of this alloy is attained, which means the critical strain. The critical strain increases with the decrease of temperature and the increase of strain rate. The predicting model of critical strain can be described by the function of εc=5.4446×10-2Z0.01878.

基金项目：

国家自然科学基金资助项目（51105132）

陈拂晓（1962-），男，博士，教授蔡志伟（1989-），男，硕士研究生

参考文献：

［1］Ren F C, Chen J. Modeling flow stress of 70Cr3Mo steel used for back-up roll during hot deformation considering strain compensation [J]. Journal of Iron and Steel Research International, 2013, 20(11):118-124.
［2］Xu Y, Hu L X, Sun Y. Dynamic recrystallization kinetics of as-cast AZ91D alloy [J]. Transactions of Nonferrous Metals Society of China, 2014, 24(6): 1683-1689.
［3］陈振华，许芳艳，傅定发，等. 镁合金的动态再结晶[J]. 化工进展，2006，25(2): 140-146.Chen Z H, Xu F Y, Fu D F, et al. Dynamic recrystallization of magnesium alloy [J]. Chemical Industry and Engineering Progress, 2006, 25(2): 140-146.
［4］赵艳君，胡治流，李逸泰，等.20SiMn3NiA钢动态再结晶的临界条件[J]. 金属热处理，2012，37(3): 20-23.Zhao Y J, Hu Z L, Li Y T, et al. Dynamic recrystallization critical condition of 20SiMn3NiA steel [J]. Heat Treatment of Metals, 2012, 37(3): 20-23.
［5］夏玉峰，赵磊，余春堂，等. 42CrMo钢动态再结晶的临界条件[J]. 材料热处理学报，2013，34(4): 74-79.Xia Y F, Zhao L, Yu C T, et al. Dynamic recrystallization critical conditions of 42CrMo steel [J]. Transactions of Materials and Heat Treatment, 2013, 34(4): 74-79.
［6］陈拂晓，郭云汉，郭俊卿，等. AZ31B镁合金热压缩力学行为与本构方程建立[J]. 锻压技术，2011，36(5): 144-147.Chen F X, Guo Y H, Guo J Q, et al. Mechanics behavior and constitutive equation of AZ31B magnesium alloy at hot compression [J]. Forging ＆ Stamping Technology, 2011, 36(5): 144-147.
［7］Wu H Y, Wu C T, Yang J C, et al. Hot workability analysis of AZ61 Mg alloys with processing maps [J]. Materials Science and Engineering A, 2014, 607: 261-268.
［8］Quan G Z, Shi Y, Wang Y X, et al. Constitutive modeling for the dynamic recrystallization evolution of AZ80 magnesium alloy based on stress-strain data [J]. Materials Science and Engineering A, 2011, 528(28): 8051-8059.
［9］Poliak E I, Jonas J J. A one-parameter approach to determining the critical conditions for the initiation of dynamic recrystallization [J]. Acta Materialia, 1996, 44(1): 127-136.
［10］欧阳德来，鲁世强，黄旭，等. TA15钛合金β区变形动态再结晶的临界条件[J]. 中国有色金属学报，2010，20(8)：1539-1544.Ouyang D L, Lu S Q, Huang X, et al. Critical conditions of dynamic recrystallization during deformation of β area in TA15 titanium alloy [J]. The Chinese Journal of Nonferrous Metals, 2010, 20(8): 1539-1544.
［11］李增德，林晨光，崔舜. V-5Cr-5Ti合金的热变形行为及加工图[J]. 稀有金属, 2015, 39(3): 207-213.Li Z D, Lin C G, Cui S. Hot deformation behavior and processing map of V-5Cr-5Ti alloy[J]. Chinese Journal of Rare Metals, 2015, 39(3): 207-213.
［12］孙朝阳，栾京东，刘赓，等. AZ31镁合金热变形流动应力预测模型[J]. 金属学报, 2012, 48(7): 853-860.Sun C Y, Luan J D, Liu G, et al. Predicted constitutive modeling of hot deformation for AZ31 magnesium alloy[J]. Acta Metallurgica Sinica, 2012, 48(7): 853-860.
［13］王庆娟，刘锋，杜忠泽，等. Cu-Cr-Zr合金的热变形行为[J]. 稀有金属, 2013, 37(5): 687-694.Wang Q J, Liu F, Du Z Z, et al. Hot compression deformation behavior of Cu-Cr-Zr alloy[J]. Chinese Journal of Rare Metals, 2013, 37(5): 687-694.
［14］Sellars C M, Whiteman J A. Recrystallization and grain growth in hot rolling [J]. Metal Science, 1979, 13(3): 187-194.

服务与反馈：

【文章下载】【加入收藏】