恢复热处理对DZ466合金组织和力学性能的影响  

Effects of rejuvenation heat treatment on the microstructure and mechanical properties of the DZ466 alloy

作　　者：罗亮 李青[1] 肖程波[1] 戴圣龙[1] LUO Liang;LI Qing;XIAO Chengbo;DAI Shenglong(Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]北京航空材料研究院先进高温结构材料重点实验室,北京100095

出　　处：《兵器材料科学与工程》2020年第4期61-65,共5页Ordnance Material Science and Engineering

基　　金：国家重点研发计划(2016YFB0701402);中国航空发动机集团产学研合作项目(HFZL2018CXY022);中国航空发动机集团自主创新专项资金项目(CXPT-2018-006);国家两机重大专项(2017-VII-0008-0102)。

摘　　要：研究恢复热处理对经950℃长期时效的DZ466合金显微组织和力学性能的影响。结果表明:恢复热处理使枝晶干处长期时效过程中被粗化和球化的γ′相重新细化和立方化,与标准热处理态组织相近;枝晶间γ基体中重新析出与标准热处理态尺寸和形貌接近但数量更多的二次γ′相;晶界γ′相膜层消失,被宽化的晶界基本恢复到标准热处理态。恢复热处理后,合金的室温抗拉强度和屈服强度均略高于标准热处理态,伸长率和断面收缩率恢复到标准热处理态的70.6%~88.5%;950℃/220 MPa持久性能达到或超过标准热处理态。The effects of rejuvenation heat treatment on the microstructure and mechanical property of DZ466 alloy after long term aging at 950℃were investigated.The results show that the coarsened and spheroidizedγ’precipitates in dendrite core during long term aging get to show fine and cuboidal morphology again after rejuvenation heat treatment,which is similar to the standard heat-treated microstructure.Meanwhile,more secondaryγ’precipitates with similar size and morphology to the standard heat-treatment distribute in theγmatrix of interdendritic region.In addition,theγ’film at the grain boundary disappears and the widened grain boundary is almost rejuvenated.After rejuvenation heat treatment,the room temperature tensile strength and yield strength of the alloy are a little higher than that of standard heat-treatment.And the elongation and reduction of area are rejuvenated to 70.6%-88.5%of the standard heat-treatment alloy.In addition,the stress-rupture properties at 950℃/220 MPa are rejuvenated or even higher than that of standard heat-treatment alloy.

关 键 词：定向凝固高温合金 DZ466 恢复热处理 显微组织 力学性能 

分 类 号：TG156.92[金属学及工艺—热处理]