低膨胀高温合金晶粒长大规律及其对性能的影响  

Grain Growth of Low Expansion Superalloy and Its Effect on Properties

作　　者：李万礼 曹国鑫[1] 刘向宏[1] 孙文儒[2] Li Wanli;Cao Guoxin;Liu Xianghong;Sun Wenru(Western Superconducting Technologies Co.,Ltd,Xi’an 710018,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]西部超导材料科技股份有限公司,陕西西安710018 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2023年第4期1499-1506,共8页Rare Metal Materials and Engineering

基　　金：陕西省重大科技项目(2020zdzx04-04-02)。

摘　　要：本工作研究了不同热处理制度对低膨胀高温合金析出相的行为以及晶粒长大的影响。实验结果表明,在Laves相析出峰温度范围(980~990℃)保温不同时间,Laves相尺寸逐渐增大,晶粒不长大。在1000~1040℃保温1 h后Laves相开始溶解,晶粒逐渐长大至4级、3.5级、3级、2级,因此在热加工过程中为避免晶粒长大,热变形加热温度不应超过1010℃,或在1000℃变形且保温时间不应超过1 h。晶界Laves相的含量对合金性能影响较小,而合金的晶粒度对其影响较大。Effects of different heat treatment regimes on the precipitate behavior and grain growth of low expansion superalloy were studied.The experimental results show that the size of Laves phase increases gradually but the grain size does not grow when under the Laves phase precipitation peak temperature ranges from 980℃to 990℃.After holding at 1000-1040℃for 1 h,Laves phase begins to dissolve,and the grain size gradually grow to grade 4,3.5,3 and 2.Therefore,in the process of hot working,to avoid the growth of grain size,the thermal deformation temperature should not exceed 1010℃,or the deformation at 1000℃and holding time should not exceed 1 h.Laves phase content at grain boundary has little effect on the properties of the alloy,but the grain size has a great effect on it.

关 键 词：LAVES相 晶粒长大 回溶 塑性 

分 类 号：TG132.11[一般工业技术—材料科学与工程] TG132.32[金属学及工艺—合金]