Microstructure evolution of GH4730 alloy during cumulative deformation

doi:10.13251/j.issn.0254-6051.2024.04.015

Abstract

Abstract: In order to obtain a homogeneous fine-grained microstructure, multiple cumulative deformation test for GH4730 alloy were carried out. The microstructure of the alloy after multiple cumulative deformations was analyzed by means of OM, SEM and EBSD. The results reveal that the proportion of recrystallisation gradually increases and the size and number of unrecrystallised grains gradually decrease as the deformation times and amount increase. The recrystallisation mechanism is dominated by discontinuous dynamic recrystallisation (DDRX), supplemented by continuous dynamic recrystallisation (CDRX). The DDRX occurs mainly between the hard oriented grains, and the Taylor factor of the residual unrecrystallised grains is generally larger. There is a large amount of fine coherent γ′ phase in the unrecrystallised microstructure. As the deformation times and amount increase, the primary γ′ phase becomes progressively coarser, with a significantly larger area fraction and a significantly smaller number of secondary γ′ phases.

Key words: inhomogeneous microstructure, γ′ precipitate phase, microstructure evolution, recrystallization mechanism, cumulative deformation

CLC Number:

TG132.3

Wang Chengyu, An Teng, Xie Xingfei, Lü Shaomin, Qu Jinglong. Microstructure evolution of GH4730 alloy during cumulative deformation[J]. Heat Treatment of Metals, 2024, 49(4): 88-94.

References

[1]江和甫. 对涡轮盘材料的需求及展望[J]. 燃气涡轮试验与研究, 2002, 15(4): 1-6.
Jiang Hefu. Requirements and forecast of turbine disk materials[J]. Gas Turbine Experiment and Research, 2002, 15(4): 1-6.
[2]张北江, 黄烁, 张文云, 等. 变形高温合金盘材及其制备技术研究进展[J]. 金属学报, 2019, 55(9): 1095-1114.
Zhang Beijiang, Huang Shuo, Zhang Wenyun, et al. Recent development of nickel-based disc alloys and corresponding cast-wrought processing techniques[J]. Acta Metallurgica Sinica, 2019, 55(9): 1095-1114.
[3]杜金辉, 赵光普, 邓群, 等. 中国变形高温合金研制进展[J]. 航空材料报, 2016, 36(3): 27-39.
Du Jinhui, Zhao Guangpu, Deng Qun, et al. Development of wrought superalloy in China[J]. Journal of Aeronautical Materials, 2016, 36(3): 27-39.
[4]杜金辉, 吕旭东, 邓群, 等. GH4169合金研制进展[J]. 中国材料进展, 2012, 31(12): 12-20, 11.
Du Jinhui, Lü Xudong, Deng Qun, et al. Progress in GH4169 alloy development[J]. Materials China, 2012, 31(12): 12-20, 11.
[5]曲敬龙, 易出山, 陈竞炜, 等. GH4720Li合金中析出相的研究进展[J]. 材料工程, 2020, 48(8): 73-83.
Qu Jinglong, Yi Chushan, Chen Jingwei, et al. Research progress of precipitated phase in GH4720Li superalloy[J]. Journal of Materials Engineering, 2020, 48(8): 73-83.
[6]Qu Jinglong, Xie Xingfei, Bi Zhongnan, et al. Hot deformation characteristics and dynamic recrystallization mechanism of GH4730 Ni-based superalloy[J]. Journal of Alloys and Compounds, 2019, 785: 918-924.
[7]Konkova T, Rahimi S, Mironov S, et al. Effect of strain level on the evolution of microstructure in a recently developed AD730 nickel based superalloy during hot forging[J]. Materials Characterization, 2018, 139: 437-445.
[8]Thébaud Louis, Villechaise Patrick, Cormier Jonathan, et al. Relationships between microstructural parameters and time-dependent mechanical properties of a new nickel-based superalloy AD730[J]. Metals, 2015, 5(4): 2236-2251.
[9]袁艺, 杨树峰, 刘威, 等. 镍基高温合金真空感应熔炼碳氧反应数值模拟[J]. 中国冶金, 2023, 33(2): 73-79.
Yuan Yi, Yang Shufeng, Liu Wei, et al. Numerical simulation of carbon-oxygen reaction in vacuum induction melting of nickel-based superalloys[J]. China Metallurgy, 2023, 33(2): 73-79.
[10]麻建中, 黄一君, 黄友桥, 等. Nimonic 80A合金螺栓的组织织构及高温应力松弛行为[J]. 中国冶金, 2022, 32(7): 74-79.
Ma Jianzhong, Huang Yijun, Huang Youqiao, et al. Texture characteristics and high temperature stress relaxation behaviors of Nimonic 80A alloy bolt[J]. China Metallurgy, 2022, 32(7): 74-79.
[11]田强, 杨曙磊, 秦鹤勇, 等. 大尺寸GH4742合金铸锭夹杂物及析出相分布特征[J]. 中国冶金, 2022, 32(2): 52-59.
Tian Qiang, Yang Shulei, Qin Heyong, et al. Characteristics of inclusions and precipitation phase distribution in large size GH4742 superalloy ingot[J]. China Metallurgy, 2022, 32(2): 52-59.
[12]吴玉博, 曲敬龙, 史松宜, 等. 固溶冷却介质对GH4720Li合金组织和性能的影响[J]. 中国冶金, 2021, 31(10): 39-45, 85.
Wu Yubo, Qu Jinglong, Shi Songyi, et al. Effect of cooling medium on microstructure and mechanical properties in GH4720Li alloy[J]. China Metallurgy, 2021, 31(10): 39-45, 85.
[13]李振团, 秦鹤勇, 田强, 等. 变形参数对GH4742合金动态再结晶及γ′相的影响[J]. 钢铁, 2022, 57(2): 117-126.
Li Zhentuan, Qin Heyong, Tian Qiang, et al. Effect of deformation parameters on dynamic recrystallization and γ′-phase of GH4742 superalloy[J]. Iron and Steel, 2022, 57(2): 117-126.
[14]孟令胜, 段方震, 安腾, 等. γ/γ′共晶相对GH4720Li合金耐腐蚀性能的影响[J]. 中国冶金, 2020, 30(7): 35-40.
Meng Lingsheng, Duan Fangzhen, An Teng, et al. Effects of γ/γ′ eutectic on corrosion resistance of GH4720Li superalloy[J]. China Metallurgy, 2020, 30(7): 35-40.
[15]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 superalloy GH4738[J]. China Metallurgy, 2021, 31(7): 13-21.
[16]荣义, 张麦仓, 杨成斌, 等. 优质GH738合金热变形过程中的再结晶机制[J]. 钢铁研究学报, 2021, 33(6): 530-538.
Rong Yi, Zhang Maicang, Yang Chengbin, et al. Recrystallization mechanism of high quality GH738 alloy during hot deformation[J]. Journal of Iron and Steel Research, 2021, 33(6): 530-538.
[17]Thébaud Louis, Villechaise Patrick, Crozet Coraline, et al. Is there an optimal grain size for creep resistance in Ni-based disk superalloys?[J]. Materials Science and Engineering A, 2018, 716: 274-283.
[18]Seret Anthony, Moussa Charbel, Bernacki Marc, et al. On the coupling between recrystallization and precipitation following hot deformation in a γ-γ′ nickel-based superalloy[J]. Metallurgical and Materials Transactions, 2018, 49: 4199-4213.
[19]Monajati H, Taheri A K, Jahazi M, et al. Deformation characteristics of isothermally forged UDIMET 720 nickel-base superalloy[J]. Metallurgical and Materials Transactions A, 2005, 36(4): 895-905.
[20]Xie B, Zhang B, Yu H, et al. Microstructure evolution and underlying mechanisms during the hot deformation of 718Plus superalloy[J]. Materials Science and Engineering A, 2020, 784: 139334.