两种不同热变形方式对于GH4169合金锻棒组织的影响  

Effect of two different hot workingmethods on microstructure of alloyGH4169forged rod

作　　者：刘桢 代朋超 LIU Zhen;DAI Peng-chao(BaoWu Special Metallurgy Co.,Ltd.,Shanghai 200940,China)

机构地区：[1]宝武特种冶金有限公司,上海200940

出　　处：《金属功能材料》2020年第3期65-68,共4页Metallic Functional Materials

摘　　要：利用有限元模拟软件Deform,模拟了变形高温合金GH4169在铸锭开坯过程中,分别采用“方-方”变形及“多向”变形两种热加工条件下,材料内部应力-应变的分布情况,同时在实际锻造过程中进行了验证。模拟结果表明,采取“多向”变形方式,能显著改善“方-方”变形中存在的变形不均匀情况,同时增加应变量。在实际生产中,“方-方”变形工艺生产的大规格棒材存在明显的残余粗晶区,采取“多向”获得了均匀的晶粒组织,未发现明显残余粗晶区,同时R/2处的室温和高温拉伸性能的波动性大幅度降低,室温面缩率和高温拉伸塑性有所提高。FEA software DEFORM was used to simulate the internal stress and strain distribution of wrought superalloy GH4169in the process of casting ingot forging,under two different hot working conditions of“square-square”deformation and“octagonal-octagonal”deformation.Simultaneously,it was verified in the actual forging process.The FEA results showed that deformation un-uniformity in the“square-square”deformation method could be improved significantly and the strain quantity could be increased when“octagonal-octagonal”deformation method was adopted.In the actual producing,the large size bar produced by“square-square”deformation process had obvious residual coarse grained region.On the contrary,it uniform grain was gained through“octagonal-octagonal”deformation process,and residual coarse grained region could not be found.At the same time,at R/2location,the fluctuation of tensile properties at room temperature and high temperature was reduced sharply,the reduction of area at room temperature and the tensile plasticity at high temperature were improved.

关 键 词：变形方式 GH4169 组织均匀性 

分 类 号：V252[一般工业技术—材料科学与工程] TG132.3[航空宇航科学与技术—航空宇航制造工程] TG316[金属学及工艺—合金]