介绍基于加工图理论的各种塑性失稳准则,比较分析各个准则的区别,以及各参数的物理意义,并以Ti2AlNb基合金为研究对象建立Prasad、Murty、Gegel和Malas准则的热加工图.结合试验结果分析和对比4种塑性失稳准则下加工图的区别发现:Prasad和Murty准则的塑性失稳图相似,均位于高应变速率区,且Murty准则的塑性失稳区稍窄;Gegel和Malas准则的塑性失稳图相似,塑性失稳区比Prasad和Murty准则的明显偏大,除高应变速率外,还能预测高温低应变速率的塑性失稳现象;解释可能出现各种失稳现象的原因,并结合各种塑性失稳准则提出判断材料塑性变形失稳的选用原则.
Four instability criteria, namely Murty, Gegel, Malas and Prasad criteria, were compared, and the physical significance of parameters was analyzed in this paper. It is indicated that the instability map developed by Murty criterion is similar to Prasad criterion, showing an unstable flow at high strain rates. Murty criterion exhibits a little narrower unstable region. The instability maps developed by Malas criterion and Gegel criterion have similar shapes, and the unstable regions are wider than those Prasad criterion and Murty criterion. In addition to the unstable flow at high strain rates as predicted by Murty criterion and Prasad criterion, Malas criterion and Gegel criterion have a good ability for predicting unstable flow at high temperatures and low strain rates. The processing maps were validated by hot compression tests of Ti-22Al-25Nb alloy, and the possible causes of various instability were discussed.
参考文献
| [1] | Raj R .[J].Metallurgical and Materials Transactions,1981,12A:1089. |
| [2] | Prasad Y V R K;Seshacharyulu T .[J].International Materials Reviews,1998,43(06):243. |
| [3] | Narayana Murty S V S;Rao B N .[J].Materials Science and Engineering,1998,A254:76. |
| [4] | Narayara Murty S V S;Rao B N;Kashyap B P .[J].Materials Science and Technology,2004,20(06):772. |
| [5] | Prasad Y V R K;Gegel H L et al.[J].Metallurgical and Materials Transactions,1984,15A:1883. |
| [6] | Malas J C;Seetharaman V.[J].JOM-Journal of the Minerals Metals and Materials Society,1992(06):8. |
| [7] | Semiatin S L;Lohoti G D .[J].Metallurgical and Materials Transactions,1981,12A:1705. |
| [8] | Montheillet F;Jonas J J;Neale K W .[J].Metallurgical and Materials Transactions,1996,27A:232. |
| [9] | Chen H L .Doctoral Dissertation[D].Missouri-Rolla:University of Missouri-Rolla,1990. |
| [10] | Narayana Murty S V S;Rao B N;Kashyap B P .[J].Journal of Materials Processing Technology,2005,166:268. |
| [11] | Spigarelli S.;Cerri E.;Cavaliere P.;Evangelista E. .An analysis of hot formability of the 6061+20% Al2O3 composite by means of different stability criteria[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(2):144-154. |
| [12] | 曾卫东,周义刚,周军,俞汉清,张学敏,徐斌.加工图理论研究进展[J].稀有金属材料与工程,2006(05):673-677. |
| [13] | 鲁世强,李鑫,王克鲁,董显娟,李臻熙,曹春晓.用于控制材料热加工组织与性能的动态材料模型理论及其应用[J].机械工程学报,2007(08):77-85. |
| [14] | 曾卫东,徐斌,何德华,梁晓波,李世琼,张建伟,周义刚.应用加工图理论研究Ti2AlNb基合金的高温变形特性[J].稀有金属材料与工程,2007(04):592-596. |
| [15] | 徐斌,曾卫东,何德华,周义刚,梁晓波,李世琼.Ti-22Al-25Nb合金热变形行为研究[J].热加工工艺,2007(01):1-4. |
| [16] | Semiatin S L;Lahoti G D .[J].Metallurgical and Materials Transactions,1981,12A(10):1705. |
| [17] | Semiatin S L;Lahoti G D .[J].Metallurgical and Materials Transactions,1982,13A:275. |
| [18] | Kutumbarao V V;Rajagopalachary T .[J].Bulletin of Materials Science,1996,19:677. |
| [19] | Venugopal S;Mannan S L et al.[J].Journal of Nuclear Materials,1995,227:1. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%