汪雨佳,王克鲁.基于极性交互模型的MoLa合金锻造工艺优化及热变形行为研究[J].稀有金属材料与工程,2018,47(7):2225~2231.[wangyujia,wangkelu.Research on Hot Deformation Behavior and Forging Process Optimization of MoLa Alloy Based on Polar Reciprocity Model[J].Rare Metal Materials and Engineering,2018,47(7):2225~2231.]
基于极性交互模型的MoLa合金锻造工艺优化及热变形行为研究
投稿时间:2016-09-06  修订日期:2017-03-07
中文关键词:  MoLa合金  本构模型  PSO-BP神经网络  极性交互模型  锻造工艺优化
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      采用Geeble1500型热模拟试验,对MoLa合金进行等温恒应变速率压缩实验,研究其在变形温度800~1150℃,应变速率0.001~10s-1范围内的热变形行为。通过对不同变形参数下的流变曲线分析发现,随应变的增加,流变曲线大多呈现为缓慢上升或保持稳定,但在应变速率为0.001s-1时,1000~1150℃变形温度下流变应力随应变的增加而下降;采用PSO-BP神经网络建立MoLa合金本构模型,经过误差计算得出,该模型的相关系数和平均相对误差分别为:0.995和1.48%,具有良好的精度;基于极性交互模型绘制MoLa合金本征热加工性能参数ξ图,并通过对失稳区和稳定区组织分析发现,失稳区主要以局部流动为失稳形式,稳定区主要以动态回复为变形机制;通过ξ图和组织观察可知,MoLa合金适宜的变形参数范围为:变形温度1100~1150℃,应变速率0.001~0.05s-1。
Research on Hot Deformation Behavior and Forging Process Optimization of MoLa Alloy Based on Polar Reciprocity Model
英文关键词:MoLa alloy  constitutive equation  PSO-BP neutral network  polar reciprocity model  forging process optimization
英文摘要:
      To investigate the flow stress characteristics and deformation?mechanism of MoLa Alloy,The isothermal compression tests were performed over the ranges of temperature 800-1150oC and the strain rate range of 0.001-10 s -1.The results show that the flow stress increases or remain stable with the increase of strain .But the flow stress decrease with the increase of strain in which the deformation temperature is 1000-1150 ℃ and the strain rate is 0.001s-1.A PSO-BP neural network has been established to describe the changing rule of flow stress with the strain rate and deformation temperature .The correlation coefficient and average?relative?error of the network have been calculated to be 0.995 and 1.48% respectively.So it is clear that the PSO-BP model has?good?accuracy .The intrinsic hot workability maps have been constructed based on the polar reciprocity model at strains of 0.3,0.6 and 0.92.?Combing microstructure observation ,it has been found that the buckling form in instability area mainly was local plastic deformation,and deformation mechanism in stability region mainly was dynamic recovery.The suitable processing parameters ranges of MoLa alloy could be inferred to be the deformation temperature range of 1100-1150 ℃ and the strain rates range of 0.001- 0.05 s-1.
作者单位E-mail
汪雨佳 南昌航空大学航空制造工程学院 18770071216@163.com 
王克鲁 南昌航空大学航空制造工程学院 wangkelu@126.com 
摘要点击次数: 11
全文下载次数: 12
查看全文  查看/发表评论  下载PDF阅读器
关闭