Ni-Cr-Al基合金电渣重熔定向凝固铸锭的偏析行为及均匀化处理  

Segregation behavior and homogenization treatment of Ni-Cr-Al based alloy ESR-CDS ingots

作　　者：张亚玮 刘雨溦 梁英凯 张继 Zhang Yawei;Liu Yuwei;Liang Yingkai;Zhang Ji(Gaona Aero Material Co.,Ltd.,Beijing 100081,China)

机构地区：[1]北京钢研高纳科技股份有限公司,北京100081

出　　处：《金属热处理》2023年第7期44-48,共5页Heat Treatment of Metals

摘　　要：采用电渣重熔(ESR)定向凝固(CDS)技术制备了Ni-Cr-Al基高温合金铸锭,对其元素偏析进行了观察分析,并对均匀化工艺进行了研究。结果表明,Ni-Cr-Al基合金铸锭组织均匀,一次和二次枝晶间距差别不大,平均二次枝晶间距及主要合金元素Al、Cr、Fe的偏析系数均小于传统ESR铸锭。Ni-Cr-Al基合金铸锭的最佳均匀化工艺为1150℃×15 h,经该工艺处理后,主要合金元素Al、Cr、Fe的偏析系数均趋于1.0,组织已无树枝晶形貌,γ′相更加细小且均匀分布,晶界碳化物呈分散颗粒状,有利于开坯锻造中的热加工塑性。Ni-Cr-Al based superalloy ingots were prepared by electroslag remelting(ESR) and directional solidification(CDS),and the elemental segregation behaviors of the alloy was observed and analyzed,and the homogenization treatment was studied accordingly.The results show that the microstructure of the Ni-Cr-Al based alloy ingots is uniform,with little difference in primary and secondary dendrite arm spacing.The average secondary dendrite spacing and the segregation coefficients of the main alloy elements Al,Cr,and Fe are smaller than those of traditional ESR ingots.The optimal homogenization treatment of the alloy is 1150 ℃×15 h,that makes the segregation coefficient of Al,Cr,Fe to 1.0 effectively,and the microstructure shows no dendrite morphology.The γ′ phase is smaller and well distributed,and especially the carbides on grain boundaries are dispersed in granular shape that are beneficial to the hot work plasticity during the following fogging process.

关 键 词：Ni-Cr-Al基合金 电渣重熔定向凝固技术 元素偏析 均匀化处理 

分 类 号：TG156[金属学及工艺—热处理]