GH5188高温合金热变形组织传递规律研究  

Study on the microstructure evolution during hot deformation of GH5188 superalloy

作　　者：郭续龙 蒋世川 Guo Xulong;Jiang Shichuan(Chengdu Advanced Metal Materials Industry Technology Research Institute Co.,Ltd.,Chengdu 610303,Sichuan,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114009,Liaoning,China)

机构地区：[1]成都先进金属材料产业技术研究院股份有限公司,四川成都610303 [2]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009

出　　处：《钢铁钒钛》2022年第5期145-152,共8页Iron Steel Vanadium Titanium

摘　　要：采用Gleeble-3800热模拟试验机研究了GH5188高温合金多道次变形和保温过程中的组织传递规律,建立了变形速率0.01~10 s^(-1),变形量50%,变形温度980~1 230℃下的热加工图,探讨了单道次变形后保温时间对双道次变形组织、双道次变形后保温时间和保温温度对组织遗传性以及双道次降温变形和保温时间对显微组织的影响。结果表明:热加工图中高功率耗散率区的边界条件分别为1 050~1 175℃、0.01~0.1 s^(-1)和1 200~1 225℃、0.01~1 s^(-1),低功率耗散率区的边界条件分别为975~1 150℃、0.01~10 s^(-1)和1 150~1 225℃、0.1~10 s^(-1);第一道次变形后保温时间过长不利于第二道次动态再结晶的发生;双道次变形后保温时,发生了明显的再结晶现象,随着保温时间的增加,晶粒未发生明显的长大;随着第二道次变形温度的降低,试样再结晶比例降低,保温温度越低,越不容易发生静态再结晶。In this paper, the transformation law of microstructure evolution during multi-pass deformation and heat preservation was investigated by a Gleeble-3800 thermal simulation testing machine. A hot working diagram was established at deformation rate 0.01-10 s^(-1), deformation amount 50%, and deformation temperature 980-1 230 ℃. The effects of holding time after single-pass deformation on the microstructure of double-pass deformation, holding time after double-pass deformation and holding temperature on the microstructure evolution, and deformation and holding time after double-pass cooling on the microstructure were discussed. The results show that the boundary conditions of the high power dissipation zone in the hot working diagram are 1 050-1 175 ℃, 0.01-0.1 s^(-1), and 1 200-1 225 ℃,0.01-1 s^(-1), respectively. The boundary conditions of the low power dissipation zone are 975-1 150 ℃,0.01-10 s^(-1), and 1 150-1 225 ℃, 0.1-10 s^(-1), respectively. Too long holding time after the first deformation is not conducive to the second dynamic recrystallization. The recrystallization phenomenon occurred after the double-pass deformation, and the grain size did not grow obviously with the increasing holding time. In addition, with the second deformation temperature decrease, the proportion of recrystallization in the specimen decreases, and the lower the holding temperature, the less likely static recrystallization occurs.

关 键 词：GH5188高温合金 多道次变形 热加工图 再结晶 保温过程 

分 类 号：TF76[冶金工程—钢铁冶金] TG132.3[一般工业技术—材料科学与工程]