718Plus合金η相析出行为及其对热变形行为的影响  

Precipitation Behavior ofηPhase and Its Effect on Hot Deformation in 718Plus Alloy

作　　者：寇金凤 白亚冠[1] 张鑫 郭伟 张冰冰 李红梅 聂义宏 Kou Jinfeng;Bai Yaguan;Zhang Xin;Guo Wei;Zhang Bingbing;Li Hongmei;Nie Yihong(Tianjin Heavy Industries Research&Development Co.,Ltd,Tianjin 300457,China;China First Heavy Industries,Qiqihar 161042,China)

机构地区：[1]天津重型装备工程研究有限公司,天津300457 [2]中国第一重型机械股份公司,黑龙江齐齐哈尔161042

出　　处：《稀有金属材料与工程》2024年第12期3465-3474,共10页Rare Metal Materials and Engineering

基　　金：黑龙江省自然科学基金(JQ2021E007)。

摘　　要：采用OM、SEM、热压缩模拟试验机等研究了718Plus合金固溶态的显微组织、η相的组织演变及无η相析出、少量η相析出、大量η相析出的试样经不同压缩量压缩后的再结晶组织,得到了不同温度不同变形速率下的压缩工艺。结果表明,718Plus合金中η相析出峰值温度在900℃。η相溶解受时间影响较大,在1040℃固溶2h后η相可完全溶解。预先析出少量η相在大变形过程中有利于动态再结晶的发生,而大量析出η相在大变形过程中抑制动态再结晶的发生。在大变形量、合适的温度、合适的变形速率下,预先析出的少量η相与动态再结晶过程相互作用,有利于获得均匀、细小的晶粒组织。Solid-state microstructure,microstructure evolution ofηphase and the recrystallization microstructure of 718Plus alloy with differentηphase after compression with different compression amounts were investigated by OM,SEM and the thermal simulation compression testing machine.The compression process of different temperatures and deformation rates were obtained.The results show that the peak temperature ofηphase precipitation occurs at 900℃.The dissolution behavior ofηphase is mainly affected by solution time,and it dissolves effectively after solution treatment at 1040℃for 2 h.A small quantity ofηphase contributes to dynamic recrystallization in large deformation process while a large quantity ofηphase restrain dynamic recrystallization.At appropriate deformation temperature and rate,a small quantity ofηphase interacts with the dynamic recrystallization process,which makes for the uniform fine crystal structure.

关 键 词：718Plus合金 Η相 析出 回溶 动态再结晶 

分 类 号：TG146.15[一般工业技术—材料科学与工程]