工程科学学报，第41卷，第3期：359-367,2019年3月 Chinese Journal of Engineering,Vol.41,No.3:359-367,March 2019 DOI:10.13374/j.issn2095-9389.2019.03.009:http://journals.ustb.edu.cn 钴基高温合金GH5605铸态组织及高温扩散退火过程 中元素再分配 刘 超”，江河)四，董建新”，章清泉) 1)北京科技大学材料科学与工程学院，北京1000832)北京首钢冶金研究院，北京100192 ☒通信作者，E-mail:jianghel7@sina.cm 摘要利用光学显微镜(OM)、场发射扫描电子显微镜(FESEM)、能谱分析(EDS)并结合热力学及动力学计算结果对采用 真空感应熔炼和电渣重熔二联工艺生产的GH5605合金电渣锭的枝晶形貌、元素偏析和析出相进行分析.探索了合金的高温 扩散退火制度并结合差示扫描量热仪(DSC)和热压缩模拟实验分析高温扩散退火前后的合金特征.结果表明：GH56O5合金 中的枝晶和元素偏析情况较轻，主要偏析元素是C和W并在枝晶间处偏聚，电渣锭中的主要析出相包括奥氏体、晶界MC6 以及晶内和晶界处的奥氏体与M,C。板条状共晶相.经12I0℃/8h扩散退火处理后枝晶和元素偏析基本消除，共晶相基本 回溶. 关键词钴基高温合金：偏析：枝晶：共晶：高温扩散退火 分类号TG146.1 As-cast microstructure and redistribution of elements in high-temperature diffusion an- nealing in cobalt-base superalloy GH5605 LIU Chao”,JIANG He)a,DONG Jian--in”,ZHANG Qing-guan2》 1)School of Materials Science and Technology,University of Science and Technology Beijing,Beijing 100083,China 2)Beijing Beiye Functional Materials Corporation,Beijing 100192,China Corresponding author,E-mail:jinghel7@sina.cn ABSTRACT The dendritic morphology,elements segregation index,precipitates morphology,and precipitates types in GH5605 in- got produced by vacuum induction melting and electroslag remelting were investigated by using optical microscopy (OM),field-emis- sion scanning electron microscopy (FESEM),energy-dispersive X-ay spectroscopy (EDS)spectrum analysis and the results of ther- modynamic and kinetic calculations by Thermal-Calc and JMatPro sofeware.To study the effects of high-temperature diffusion annealing on GH5605 ingot,the annealing system was investigated and the microstructure and macrostructure characteristics of GH5605 ingot were analyzed before and after the diffusion annealing by differential scanning calorimetry (DSC)and thermal compression simulation tests in Gleeble 3800 test machine.In the OM results,dendrites are not obvious,and secondary dendritic arms cannot be distinguished in the GH5605 surface but they are gradually clearer toward the center area.The EDS results show that element segregation index is comparably small in GH5605 ingot:every element segregation index is in the range of 0.9-1.4 which is not as large as those of nickel- based superalloy.The main segregating elements during solidification are Cr and W which mainly segregate in the dendritic regions. According to the FESEM results,the precipitate phases include austenite and grain boundary carbide M2C and because of the Cr and W segregation at dendritic arms,an unexpected eutectic phase comprising austenite and MaC appears,and the alternating lamellae of austentite and MCs develop a lathlike morphology.Different macrostructure and microstructure characteristics including the morpholo- 收稿日期：20180203 基金项目：国家自然科学基金资助项目(51571012)：中央高校基本业务费资助项目(2017YFB0305201)工程科学学报，第 41 卷，第 3 期: 359--367，2019 年 3 月 Chinese Journal of Engineering，Vol． 41，No． 3: 359--367，March 2019 DOI: 10． 13374 /j． issn2095--9389． 2019． 03． 009; http: / /journals． ustb． edu． cn 钴基高温合金 GH5605 铸态组织及高温扩散退火过程 中元素再分配 刘 超1) ，江 河1) ，董建新1) ，章清泉2) 1) 北京科技大学材料科学与工程学院，北京 100083 2) 北京首钢冶金研究院，北京 100192 通信作者，E-mail: jianghe17@ sina． cn 摘 要 利用光学显微镜( OM) 、场发射扫描电子显微镜( FESEM) 、能谱分析( EDS) 并结合热力学及动力学计算结果对采用 真空感应熔炼和电渣重熔二联工艺生产的 GH5605 合金电渣锭的枝晶形貌、元素偏析和析出相进行分析． 探索了合金的高温 扩散退火制度并结合差示扫描量热仪( DSC) 和热压缩模拟实验分析高温扩散退火前后的合金特征． 结果表明: GH5605 合金 中的枝晶和元素偏析情况较轻，主要偏析元素是 Cr 和 W 并在枝晶间处偏聚，电渣锭中的主要析出相包括奥氏体、晶界 M23C6 以及晶内和晶界处的奥氏体与 M23C6板条状共晶相． 经 1210 ℃ /8 h 扩散退火处理后枝晶和元素偏析基本消除，共晶相基本 回溶． 关键词 钴基高温合金; 偏析; 枝晶; 共晶; 高温扩散退火 分类号 TG146. 1 收稿日期: 2018--02--03 基金项目: 国家自然科学基金资助项目( 51571012) ; 中央高校基本业务费资助项目( 2017YFB0305201) As-cast microstructure and redistribution of elements in high-temperature diffusion an￾nealing in cobalt-base superalloy GH5605 LIU Chao1) ，JIANG He1)  ，DONG Jian-xin1) ，ZHANG Qing-quan2) 1) School of Materials Science and Technology，University of Science and Technology Beijing，Beijing 100083，China 2) Beijing Beiye Functional Materials Corporation，Beijing 100192，China Corresponding author，E-mail: jinghe17@ sina． cn ABSTＲACT The dendritic morphology，elements segregation index，precipitates morphology，and precipitates types in GH5605 in￾got produced by vacuum induction melting and electroslag remelting were investigated by using optical microscopy ( OM) ，field-emis￾sion scanning electron microscopy ( FESEM) ，energy-dispersive X-ray spectroscopy ( EDS) spectrum analysis and the results of ther￾modynamic and kinetic calculations by Thermal-Calc and JMatPro sofeware． To study the effects of high-temperature diffusion annealing on GH5605 ingot，the annealing system was investigated and the microstructure and macrostructure characteristics of GH5605 ingot were analyzed before and after the diffusion annealing by differential scanning calorimetry ( DSC) and thermal compression simulation tests in Gleeble 3800 test machine． In the OM results，dendrites are not obvious，and secondary dendritic arms cannot be distinguished in the GH5605 surface but they are gradually clearer toward the center area． The EDS results show that element segregation index is comparably small in GH5605 ingot; every element segregation index is in the range of 0. 9--1. 4 which is not as large as those of nickel￾based superalloy． The main segregating elements during solidification are Cr and W which mainly segregate in the dendritic regions． According to the FESEM results，the precipitate phases include austenite and grain boundary carbide M2 3C6 and because of the Cr and W segregation at dendritic arms，an unexpected eutectic phase comprising austenite and M23C6 appears，and the alternating lamellae of austentite and M23C6 develop a lathlike morphology． Different macrostructure and microstructure characteristics including the morpholo-