为研究工业纯钛的动态再结晶行为,利用Gleebe 实验机对工业纯钛在变形温度为700,800,900和950℃及应变速率为0．01,0．1,1和5 s-1的条件下进行热模拟压缩实验.应用加工硬化率对实验得到的应力-应变数据进行处理,结合变形后材料微观组织的分析,求得工业纯钛的动态再结晶临界条件.结果表明,工业纯钛在热变形过程中发生了回复与再结晶；发生动态再结晶时,再结晶临界应变随温度的升高及变形速率的降低而减小.将 lnθ-ε曲线的拐点处对应的应变作为材料的再结晶临界应变是合理的,工业纯钛动态再结晶临界应变εc 与峰值应变εp 之间满足εc ＝0．485εp .
The hot temperature compression test of commercially pure titanium was carried out by Gleeble-1500D thermal simulation test machine to investigate the dynamic recrystallization behavior.The deformation tempera-tures were 700,800,900 and 950 ℃.The strain rates were 0.01,0.1,1 and 5 s-1 .Dynamic recrystallization critical condition was obtained by calculation of true stress-strain data from the experiment and the analysis of material microstructure after deformation.The results show that the dynamic recovery and recrystallization oc-cur during thermal deformation process.Recrystallization critical strain decreases with the rise of temperature and the decrease of deformation rate when dynamic recrystallization occurs.It was reasonable to regard the in-fection point of lnθ-ε curve as material recrystallization critical strain.There was a relationship between dynamic recrystallization critical strain and peak strain:εc =0.485εp .
参考文献
| [1] | John J. Jonas;Xavier Quelennec;Lan Jiang .The Avrami kinetics of dynamic recrystallization[J].Acta materialia,2009(9):2748-2756. |
| [2] | 张鑫,张毅.Cu-Ni-Si-Ag合金高温变形行为研究[J].功能材料,2013(05):623-626,631. |
| [3] | 欧阳德来,鲁世强,黄旭,雷力明.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(08):1539-1544. |
| [4] | 欧阳德来,鲁世强,崔霞,董显娟,吴超,邱伟.应用加工硬化率研究TA15钛合金β区变形的动态再结晶临界条件[J].航空材料学报,2010(02):17-23. |
| [5] | S. I. Kim;Y. Lee;S. M. Byon .Study on constitutive relation of AISI 4140 steel subject to large strain at elevated temperatures[J].Journal of Materials Processing Technology,2003(1/3):84-89. |
| [6] | G.V.S.S. Prasad;M. Goerdeler;G. Gottstein .Work hardening model based on multiple dislocation densities[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(0):231-233. |
| [7] | E. I. POLIAK;J. J. JONAS .Critical Strain for Dynamic Recrystallization in Variable Strain Rate Hot Deformation[J].ISIJ International,2003(5):692-700. |
| [8] | E.I.POLIAK;J.J.JONAS .A ONE-PARAMETER APPROACH TO DETERMINING THE CRITICAL CONDITIONS FOR THE INITIATION OF DYNAMIC RECRYSTALLIZATION[J].Acta materialia,1996(1):127-136. |
| [9] | Yang Yongshun;Yang Ming;Guo Junqing .Research on dynamic recrystallization of AZ80A alloy[J].Material &Heat Treatment,2011,40(22):82-88. |
| [10] | Zhang Bo;Peng Yan;Sun Jianliang et al.Dynamic re-crystallization critical conditions of chydrogenation reac-tor heavy cylinder manufactured with alloy steel[J].Material & Heat Treatment,2012,41(22):13-16. |
| [11] | 黄光杰,钱宝华,汪凌云,J.J.Jonas.AZ31镁合金初始动态再结晶的临界条件研究[J].稀有金属材料与工程,2007(12):2080-2083. |
| [12] | Zhao Yanjun;Hu Zhiliu;LI Yitai .Dynamic critical con-dition of 20SiMn3NiA steel[J].Heat Treatment of Met-al,2012,37(03):20-23. |
| [13] | 郑华雷,杨合,李宏伟.纯钛压缩变形下的晶体塑性有限元分析[J].塑性工程学报,2013(01):95-99. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%