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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。
The plastic instability criterion based on the processing graph theory is introduced. The differences of each criterion and the physical meaning of each parameter are compared and analyzed. And the thermal processing diagrams of Prasad, Murty, Gegel and Malas criterion are established by taking Ti2AlNb based alloy as the research object. Based on the analysis of the test results and the comparison of the four kinds of plastic instability criteria, the difference between the processing maps shows that the plastic instability maps of the Prasad and Murty criteria are similar, both are in the high strain rate zone, and the plastic instability zone of Murty criterion is slightly narrower. Gegel and The plastic instability map of Malas criterion is similar. The plastic instability zone is obviously larger than that of Prasad and Murty criterion. In addition to high strain rate, plastic instability of high strain rate and low strain rate can be predicted. Various instability phenomena may be explained The reasons for the combination of various plastic instability criteria proposed to determine the material plastic deformation instability principle of selection.