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

doi:10.13251/j.issn.0254-6051.2023.07.008

Abstract

Abstract: 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.

Key words: Ni-Cr-Al based alloy, ESR-CDS technology, element segregation, homogenization treatment

CLC Number:

TG156

Zhang Yawei, Liu Yuwei, Liang Yingkai, Zhang Ji. Segregation behavior and homogenization treatment of Ni-Cr-Al based alloy ESR-CDS ingots[J]. Heat Treatment of Metals, 2023, 48(7): 44-48.

References

[1]孙长波, 付广艳, 刘群. Ni-Cr-Al合金在1000 ℃空气中的氧化[J]. 材料与冶金学报, 2004, 3(4): 313-316.
Sun Changbo, Fu Guangyan, Liu Qun. Air oxidation of Ni-Cr-Al alloys at1000 ℃[J]. Journal of Materials and Metallurgy, 2004, 3(4): 313-316.
[2]Huang W, Chang Y A. Thermodynamic properties of the Ni-Al-Cr system[J]. Intermetallics, 1999, 7(8): 863-874.
[3]Hardy M C, Argyrakis C, Kitaguchi H S, et al. Developing alloy compositions for future high temperature disk rotors[C]//Superalloys 2020. Warrendale: TMS, 2020: 19-30.
[4]毕中南, 董建新, 张麦仓, 等. Ni-Cr-Al合金中Cr、Al含量对热加工性的影响[J]. 稀有金属材料与工程, 2010, 39(11): 1938-1942.
Bi Zhongnan, Dong Jianxin, Zhang Maicang, et al. Effects of Cr and Al contents on hot workability of Ni-Cr-Al alloys[J]. Rare Metal Material and Engineering, 2010, 39(11): 1938-1942.
[5]Miao Zhujun, Shan Aidang, Wu Yuanbiao, et al. Quantitative analysis of homogenization treatment of INCONEL 718 superalloy[J]. Transactions of Nonferrous Metals Society of China, 2011, 21: 1009-1017.
[6]Kenji Sugiyama, Yoshinori Sumi, Naoya Kanno, et al. Alloy design and microstructural evolution during heat treatment of newly developed cast and wrought Ni-base superalloy M647 for turbine disk application[C]//Superalloys 2020. Warrendale: TMS, 91-102.
[7]王建武, 王宁, 杨树峰. 基于数值模拟的镍基高温合金电渣重熔工艺优化[J]. 中国冶金, 2022, 32(3): 80-86.
Wang Jianwu, Wang Ning, Yang Shufeng. Optimization of electroslag remeling process of Ni-based superalloys based on numerical simulation[J]. China Metallurgy, 2021, 32(3): 80-86.
[8]Li Fulin, Fu Rui, Feng Di, et al. Microstructure andsegregation behavior of Rene88DT alloy prepared by ESR-CDS[J]. Rare Metal Materials and Engineering, 2016, 45(6): 1437-1442.
[9]尹法杰, 付锐, 李福林, 等. 新型铸＆锻FGH4096合金涡轮盘研究[J]. 钢铁研究学报, 2018, 30(1): 32-41.
Yin Fajie, Fu Rui, Li Fulin, et al. Research on novel cast and wrought superalloy FGH4096 for aircraft turbine disk applications[J]. Journal of Iron and Steel Research, 2018, 30(1): 32-41.
[10]王璐, 肖志霞, 赵琳, 等. 高温合金Inconel718、Inconel706和Inconel706M电渣重熔组织均匀性[J]. 铸造技术, 2020, 41(1): 9-14.
Wang Lu, Xiao Zhixia, Zhao Lin, et al. Homogeneity of electroslag remelting microstructure of superalloy Inconel718, Inconel706 and Inconel706M[J]. Foundry Technology, 2020, 41(1): 9-14.
[11]向雪梅, 江河, 董建新, 等. 难变形高温合金GH4975的铸态组织及均匀化[J]. 金属学报, 2020, 56(7): 988-996.
Xiang Xuemei, Jiang He, Dong Jianxin, et al. As-cast microstructure characteristic and homogenization of a newly developed hard-deformed Ni-based superalloy GH4975[J]. Acta Metallurgica Sinica, 2020, 56(7): 988-996.
[12]谷雨, 杨树峰, 赵朋, 等. 镍基高温合金GH4738的凝固偏析和碳化物析出行为[J]. 中国冶金, 2021, 31(7): 13-21.
Gu Yu, Yang Shufeng, Zhao Peng, et al. Solidification segregation and carbide precipitation behavior of nickel-based superlloys GH4738[J]. China Metallurgy, 2021, 31(7): 13-21.
[13]周舸, 张思倩, 张浩宇, 等. GH79合金高温变形行为及变形机理研究[J]. 稀有金属材料与工程, 2019, 48(12): 3939-3946.
Zhou Ge, Zhang Siqian, Zhang Haoyu, et al. Elevated temperature compression deformation behavior and mechanism of GH79 superalloy[J]. Rare Metal Material and Engineering, 2019, 48(12): 3939-3946.
[14]肖东平, 周扬, 付建辉, 等. GH141合金的凝固偏析特性及均匀化处理[J]. 金属热处理, 2022, 47(5): 141-147.
Xiao Dongping, Zhou Yang, Fu Jianhui, et al. Solidification segregation characteristic and homogenization treatment of GH141 superalloy[J]. Heat Treatment of Metals, 2022, 47(5): 141-147.
[15]杜星霖, 鞠泉, 马惠萍, 等. GH3230合金M₂₃C₆型碳化物的析出行为[J]. 金属热处理, 2021, 46(2): 141-147.
Du Xinglin, Ju Quan, Ma Huiping, et al. Precipitation behavior of M₂₃C₆ type carbides in GH3230 alloy[J]. Heat Treatment of Metals, 2021, 46(2): 141-147.