锻压技术

DB685钢的热变形行为及热加工图

英文标题：Heat deformation behavior and heat processing map of steel DB685

作者：李立新周志峰张涛马文超

单位：武汉科技大学

关键词：DB685钢本构方程热加工图热变形特性耗散系数

分类号：TG314

出版年,卷(期):页码：2016,41(9):126-129

摘要：

为了研究DB685钢的热变形特性，选取并建立了DB685钢的高温应力应变本构方程，利用Gleeble-1500热模拟

机对DB685钢在变形温度为900~1200 ℃、应变速率为0.01~10 s-1、最大应变量70％条件下进行压缩实验，

根据建立的本构方程，绘制DB685钢的热变形加工图，利用所建立的加工图，分析了不同温度和应变速率下

合金的热成形性能，结果表明：随着变形温度的升高和应变速率的降低，合金的流变应力下降，动态再结晶

更容易发生；DB685钢在1125 ℃温度以上，并且在对应的应变速率下，耗散系数存在峰值；随着应变的增大

，其耗散系数略有增大，失稳区减小，但热加工图的整体趋势保持一定。因此对于工业热加工，建议变形温

度为1125~1175 ℃，应变速率高于0.032 s-1。

In order to study the thermal deformation behavior of the steel DB685, its flow stress

constitutive equation at high-temperature was chosen and established, and the heat compression

tests were conducted by Gleeble-1500 thermal mechanical simulator within a temperature range

form 900 ℃ to 1200 ℃, strain range from 0.01 s-1 to 10 s-1 and the maximum strain of 70％.

Based on the above constitutive equation, processing map of steel DB685 was designed, and

formability of steel DB685 was analyzed at various temperatures and strain rates. The result

shows that with the increase of the deformation temperature and the decrease of stress rate,

the flow stress decreases obviously, and the possibility of dynamic recrystallization

increases. When the temperature is above 1125 ℃，the dissipation factor of steel DB685

reaches a peak value under the related strain rate. With the strain rate increase, the

dissipation factor increases slightly, and the wrinkle area reduces. Furthermore, the overall

trend of heat processing map remains the same. Thus, the deformation temperature 1125-1175 ℃

and the strain rate more than 0.032 s-1 are recommended to set in the industrial forming

conditions.

基金项目：

钢铁冶金及资源利用省部共建教育部重点实验室开放基金项目（FMRU2007Y01）

李立新(1963-),男,博士,教授周志峰(1990-)，男，硕士研究生

参考文献：

［1］ Carsi M, Allende R, Penalba F, et al. Simulation of the forming behaviour of a boron modified P91 ferritic steel[J]. Steel Research International,2004，75(1):26-32.

［2］鞠泉，李殿国，刘国权. 15Cr-25Ni-Fe基合金高温塑性变形行为的加工图[J].金属学报，2006，42（2）：218-224.

Ju Q, Li D G, Liu G Q. The processing map of hot plastic deformation of a 15Cr-25Ni-Fe base superalloy[J]. Acta Metallurgica Sinica,2006，42(2):218-224.

［3］黄光胜，汪凌云，陈华，等. 2618铝合金的热变形和加工图[J].中国有色金属学报，2005，15（5）：763-767.

Huang G S, Wang L Y, Chen H, et al. Hot deformation and processing maps of 2618 aluminum alloy[J]. The Chinese Journal of Nonferrous Metals, 2005，15(5):763-767.

［4］汪凌云，范永革，黄光杰，等. 镁合金AZ31B的高温塑性变形及加工图理论研究[J]. 中国有色金属学报，2004，14(7)：1068-1072.

Wang L Y, Fan Y G, Huang G J, et al. Research on plastic deformation at elevated temperature and processing maps of magnesium alloy[J]. The Chinese Journal of Nonferrous Metals, 2004，14(7): 1068-1072.

［5］ Karthikeyan R, Ramanathan S, Gupta M. Development of processing maps for Al/SiCp composite using fuzzy logic[J].Journal of Materials Processing Technology,2007，183(1):104-110.

［6］ Prasad Y V R K, Gegeel H L, Doraivelu S M, et al. Modeling of dynamic material behavior in hot deformation:forging of Ti-6242[J]. Metall. Trans. A, 1984，15:1883-1892.

［7］黄有林，王建波，凌学士，等. 热加工图理论的研究进展[J]. 材料导报， 2008，12(22):173-176.

Hang Y L, Wang J B, Ling X S,et al. Research development of hot processing map theory[J]. Materials Review,2008, 12(22):173-176.

［8］ Narayana Murty S V S, Nageswara Raoet B. On the development of insability criteria during hotworking with reference to IN718[J]. Mater. Sci. Eng. A,1998，254:76-82.

［9］辛选荣，赵文龙，谢田.TB8钛合金常温压缩应力应变曲线分析[J]. 锻压技术，2014,39(1):126-130.

Xin X R, Zhao W L, Xie T, Analysis of TB8 titanium alloy compression stress-strain curve at room temperature [J]. Forging & Stamping Technology,2014，39(1):126-130.

［10］邓馗，李永堂，付建华，等.铸态p91耐热合金钢高温流变行为及本构方程[J]. 锻压技术，2015,40(11):100-106.

Deng K, Li Y T, Fu J H, et al. Hot deformation of p91 heat-resistant steel and related flow stress constitutive equations[J]. Forging & Stamping Technology,2015，40(11):100-106.

［11］Kozlowski P F, Thomas B G, Azzi J A, et al.Simple constitutive equations for steel at high temperature[J]. Metall.Trans., 1992，23A(3): 903-918.

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