摘要
通过JMatPro软件计算GH6783高温合金的析出相、均匀化温度及均匀化时间。通过光学显微镜、扫描电镜、能谱扫描表征铸态及均匀化后合金的微观组织,并分析元素偏析情况,研究GH6783高温合金均匀化过程中微观组织、元素偏析系数的演变规律。研究表明,GH6783高温合金的主要析出相包括低熔点脆性相(Laves相)和NiAl相等。铸态GH6783高温合金中偏析最严重的是Nb元素,偏析系数达2.205,其次是Ti元素。Nb和Ti元素均呈正偏析,Cr、Fe、Co等元素呈负偏析。采用两阶段均匀化工艺:1130℃×4 h+1190℃×32 h可使铸态GH6783高温合金中的Laves相回溶,并使各元素扩散均匀。均匀化后,Nb元素偏析系数降低至1.048。
Precipitates,homogenization temperature and homogenization time of GH6783 superalloy were calculated by JMatPro software.Microstructure of the as-cast and homogenized alloy and the segregation behavior of elements were analyzed and characterized by means of optical microscope,scanning electron microscope and energy dispersive spectrometer,in order to analyze evolution law of microstructure and segregation coefficient during the homogenization process of the GH6783 superalloy.The results show that major precipitates of the GH6783 superalloy include low-melting brittle phase(Laves phase),NiAl phase,et al.Nb element is the most serious segregation element of the as-cast GH6783 superalloy,with segregation coefficient up to 2.205,and Ti element is secondly serious.Nb and Ti elements are positive segregation element,and Cr,Fe and Co are negative segregation.Two stage homogenization treatment at 1130℃for 4 h and 1190℃for 32 h can dissolve Laves phase and make element diffusion uniformly of the as-cast GH6783 superalloy.After homogenization,segregation coefficient of Nb element decreases to 1.048.
作者
戚慧琳
蒋世川
郭续龙
唐平梅
Qi Huilin;Jiang Shichuan;Guo Xulong;Tang Pingmei(Research Department of Special Steel Technology,Chengdu Advanced Metal Materials Industrial Technology Institute Co.,Ltd.,Chengdu Sichuan 610303,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第12期184-190,共7页
Heat Treatment of Metals
