基于三维热加工图的X12合金的热变形行为  

Hot deformation behavior of X12 alloy based on three-dimensional hot working diagram

作　　者：杨喜晴 陈学文[1] 王继业 刘佳琪 张家银 YANG Xi-qing;CHEN Xue-wen;WANG Ji-ye;LIU Jia-qi;ZHANG Jia-yin(Henan University of Science and Technology,Luoyang 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院

出　　处：《材料热处理学报》2019年第7期140-148,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51575162)

摘　　要：三维热加工图描述了功率耗散区和流动失稳区随着应变速率、温度和应变的变化。采用Gleeble-1500D热/力模拟试验机在变形温度950~1200℃,应变速率0. 05-5s^-1的条件下对X12合金的热变形行为进行了研究。考虑应变对X12合金可成形性的影响,基于动态材料模型,建立了X12合金的三维热加工图,确定了X12合金热变形的最佳参数为应变大于0.3,温度为1150~1200℃,应变速率为0.05-0.63s^-1。通过对有限元软件DEFORM的二次开发,将X12合金的三维加工图数据与DEFORM进行集成,对 8mm×12mm×12合金圆柱试样在不同温度及应变速率下的压缩过程进行了有限元模拟,得到了该试样压缩过程中的功率耗散系数及流动失稳系数分布图,验证了X12合金的最佳热变形工艺参数。The three-dimensional hot working diagram describes the variation of the power dissipation region and the flow instability region with strain rate, temperature and strain. The hot deformation behavior of X12 alloy was studied by using a Gleeble- 1500D thermal mechanical simulation testing machine at deformation temperature of 950-1200℃ and strain rate of 0. 05-5 s^- 1. Considering the influence of strain on the formability of the X12 alloy , based on the dynamic material model, the three-dimensional hot working diagram of the X12 alloy is established, and the optimum parameter for hot deformation of the X12 alloy is determined that the strain is greater than 0. 3 , the temperature is 1150-1200 ℃, and the strain rate is 0. 05-0. 63 s ^-1. Through the secondary development of the finite element software DEFORM , the three-dimensional machining map data of the X12 alloy is integrated with the DEFORM , and the compression process of the (φ8 mm× 12 mm ×12 alloy cylindrical sample under different temperatures and strain rates is simulated by the finite element method, and the power dissipation coefficient and the flow instability coefficient distribution of the sample during compression are obtained, and the optimal hot deformation process parameters of the X12 alloy are verified.

关 键 词：X12合金 三维热加工图 功率耗散 流动失稳 可成形性 

分 类 号：TG142.3[一般工业技术—材料科学与工程]