GH141高温合金流变行为及热加工工艺窗口研究  

Study on rheological behavior and hot working process window of GH141 superalloy

作　　者：金明[1] 张晋源[1] JIN Ming;ZHANG Jin-yuan(School of Vehicle Engineering,Chongqing Industry Polytechnic College,Chongqing 401120,China)

机构地区：[1]重庆工业职业技术学院车辆工程学院,重庆401120

出　　处：《塑性工程学报》2023年第9期142-149,共8页Journal of Plasticity Engineering

基　　金：重庆市教委科学技术研究项目(KJQN202103209)。

摘　　要：为研究GH141高温合金的高温流变行为及热加工工艺窗口,对GH141高温合金在变形温度1000~1200℃、应变速率0.01~10 s^(-1)的条件下进行了等温压缩实验,获得了20组高温流变数据;基于高温流变数据建立了GH141高温合金的Hansel-Spittel本构模型和热加工图;对不同热压缩试样进行了微观组织分析。结果表明:Hensel-Spittel本构模型对该材料流变数据的回归系数为0.99,其逼近精度较高;当应变为0.1时,失稳区域出现在温度1000~1100℃,对数应变速率约为1的范围内;当应变大于0.1时,失稳区域位于高温高应变速率区域。在温度为1000和1050℃时,对GH141合金进行热加工使原始粗大的组织发生变形和拉伸,晶界处出现细小的再结晶晶粒;当变形温度升至1100℃时,部分原始粗大晶粒被更小的再结晶晶粒所取代,但仍然有一些原始晶粒残留在材料内部;当温度达到1150和1200℃时,GH141合金的全部原始粗大晶粒被新的再结晶细小晶粒替代。微观组织分析证明了热加工图能够用来衡量GH141合金发生动态再结晶的程度;结合热加工图、微观组织图和动态再结晶分布,确定了GH141合金的最佳热加工窗口,即应变速率在0.01~0.1 s^(-1),温度在1150~1200℃。To study the high temperature rheological behavior and hot working process window of GH141 superalloy,the isothermal compression experiments of GH141 superalloy were carried out under the conditions of deformation temperature of 1000-1200℃and strain rate of 0.01-10 s^(-1),and 20 sets of high temperature rheological data were obtained.Hansel-Spittel constitutive model and hot working maps of GH141 superalloy were established based on high temperature rheological data.The microstructure of different hot compression samples was analyzed.The results show that the regression coefficient of Hensel-Spittel constitutive model to the rheological data of the material is 0.99,and its approximation accuracy is high.When the strain is 0.1,the unstable region appears in the temperature range of 1000~1100℃,with a logarithmic strain rate of approximately 1.When the strain is greater than 0.1,the unstable region located in the high-temperature and high-strain-rate region.When GH141 alloy is subjected to hot working at temperatures of 1000 and 1050℃,the original coarse microstructure undergoes deformation and elongation,accompanied by the formation of small recrystallized grains along grain boundaries.As the deformation temperature rises to 1100℃,some of the original coarse grains are replaced by smaller recrystallized grains,while some original grains remain within the material.When the temperature reaches 1150 and 1200℃,all the original coarse grains in GH141 alloy are completely replaced by new and fine recrystallized grains.Microscopic analysis validates the utility of the hot working map in quantifying the extent of dynamic recrystallization in GH141 alloy.Combining the hot working map,microstructure and dynamic recrystallization distribution,the optimal hot working process window for GH141 alloy is determined to be within strain rate range of 0.01-0.1 s^(-1)and temperature range of 1150-1200℃.

关 键 词：GH141高温合金 流变数据 本构方程 热加工图 

分 类 号：TG146.1[一般工业技术—材料科学与工程]