GH5188高温合金热变形组织传递规律研究

郭续龙; 蒋世川

doi:10.7513/j.issn.1004-7638.2022.05.021

GH5188高温合金热变形组织传递规律研究

doi: 10.7513/j.issn.1004-7638.2022.05.021

郭续龙^{1, 2,},
蒋世川^{1, 2}

1.
成都先进金属材料产业技术研究院股份有限公司, 四川成都 610303
2.
海洋装备用金属材料及其应用国家重点实验室, 辽宁鞍山 114009

详细信息

作者简介:
郭续龙，1993年出生，男，山西吕梁人，硕士研究生，助理工程师，长期从事高温合金方面的基础研究工作，E-mail：799773653@qq.com

中图分类号: TF76,TG132.3
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出版历程
- 收稿日期: 2022-01-17
- 刊出日期: 2022-11-01

Study on the microstructure evolution during hot deformation of GH5188 superalloy

Guo Xulong^{1, 2
,},
Jiang Shichuan^{1, 2}

1.
Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu 610303, Sichuan, China
2.
State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, Liaoning, China

摘要

摘要: 采用Gleeble-3800热模拟试验机研究了GH5188高温合金多道次变形和保温过程中的组织传递规律，建立了变形速率0.01～10 s⁻¹，变形量50%，变形温度980～1230 ℃下的热加工图，探讨了单道次变形后保温时间对双道次变形组织、双道次变形后保温时间和保温温度对组织遗传性以及双道次降温变形和保温时间对显微组织的影响。结果表明：热加工图中高功率耗散率区的边界条件分别为1050～1175 ℃、0.01～0.1 s⁻¹和1200～1225 ℃、0.01～1 s⁻¹，低功率耗散率区的边界条件分别为975～1150 ℃、0.01～10 s⁻¹和1150～1225 ℃、0.1～10 s⁻¹；第一道次变形后保温时间过长不利于第二道次动态再结晶的发生；双道次变形后保温时，发生了明显的再结晶现象，随着保温时间的增加，晶粒未发生明显的长大；随着第二道次变形温度的降低，试样再结晶比例降低，保温温度越低，越不容易发生静态再结晶。
- GH5188高温合金 /
- 多道次变形 /
- 热加工图 /
- 再结晶 /
- 保温过程
Abstract: In this paper, the transformation law of microstructure evolution during multi-pass deformation and heat preservation was investigated by a Gleeble-3800 thermal simulation testing machine. A hot working diagram was established at deformation rate 0.01−10 s⁻¹, deformation amount 50%, and deformation temperature 980−1230 ℃. The effects of holding time after single-pass deformation on the microstructure of double-pass deformation, holding time after double-pass deformation and holding temperature on the microstructure evolution, and deformation and holding time after double-pass cooling on the microstructure were discussed. The results show that the boundary conditions of the high power dissipation zone in the hot working diagram are 1050−1175 ℃, 0.01−0.1 s⁻¹, and 1200−1225 ℃, 0.01−1 s⁻¹, respectively. The boundary conditions of the low power dissipation zone are 975−1150 ℃, 0.01−10 s⁻¹, and 1150−1225 ℃, 0.1−10 s⁻¹, respectively. Too long holding time after the first deformation is not conducive to the second dynamic recrystallization. The recrystallization phenomenon occurred after the double-pass deformation, and the grain size did not grow obviously with the increasing holding time. In addition, with the second deformation temperature decrease, the proportion of recrystallization in the specimen decreases, and the lower the holding temperature, the less likely static recrystallization occurs.
- GH5188 superalloy /
- multi-pass deformation /
- thermal processing map /
- recrystallization /
- heat preservation

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图 1 GH5188合金的应变量为50%时的功率耗散图

Figure 1. Power dissipation diagram of GH5188 alloy at 50% strain

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图 2 GH5188合金的应变量为50%时的失稳图

Figure 2. Instability diagram of GH5188 alloy at 50% strain

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图 3 GH5188合金变形量为50%时的加工图

Figure 3. Processing drawing of GH5188 alloy at 50% deformation

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图 4 单道次变形40%后经不同保温时间再变形40%前后的显微组织

Figure 4. The microstructure before and after deforming 40% in a single pass and then deforming 40% after different holding times

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图 5 不同双道次变形条件变形后保温30 min和60 min的显微组织

Figure 5. The microstructure of different two-pass deformation conditions after deformation and holding for 30 min and 60 min

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图 6 不同双道次变形条件变形后保温30 min和60 min的显微组织

Figure 6. The microstructure of different two-pass deformation conditions after deformation and holding for 30 min and 60 min

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图 7 1 180 ℃-40%+15 min+1150 ℃-40%双道次变形后保温不同时间的显微组织

Figure 7. The microstructure of 1180 ℃-40%+15 min+1150 ℃-40% double-pass deformation and heat preservation for a different times

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表 1 GH5188棒材化学成分

Table 1. Chemical conposition of GH5188 superalloy bar %

C	Cr	Ni	Co	W	Fe	B	La
0.078	21.023	21.447	余量	13~16	0.497	0.0029	<0.4

Mn	Si	P	S	Al	Bi	Pb	Ti
0.837	0.430	0.0070	<0.001	0.054	<0.001	<0.005	0.012

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表 2 GH5188合金在不同变形条件下应变速率敏感指数m

Table 2. The strain rate sensitivity index m of GH5188 alloy under different deformation conditions

$ \dot{\mathrm{\epsilon }} $/s^-1	m
$ \dot{\mathrm{\epsilon }} $/s^-1	980 ℃	1030 ℃	1080 ℃	1130 ℃	1180 ℃	1230 ℃
0.01	0.15777	0.17063	0.26144	0.398	0.14436	0.51328
1	0.03578	0.05818	0.03382	0.04866	0.16238	0.06807
5	0.04356	0.06479	0.06049	0.11201	0.09937	0.16033
10	0.05495	0.07496	0.08893	0.16888	0.06117	0.23961

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表 3 GH5188合金在不同变形条件下功率耗散效率因子η值

Table 3. The power dissipation efficiency factor η value of GH5188 alloy under different deformation conditions

$ \dot{\mathrm{\epsilon }} $/s^-1	η
$ \dot{\mathrm{\epsilon }} $/s^-1	980 ℃	1030 ℃	1080 ℃	1130 ℃	1180 ℃	1230 ℃
0.01	0.27254	0.29152	0.41451	0.56938	0.2523	0.67837
1	0.06909	0.10996	0.06543	0.0928	0.27939	0.12746
5	0.08348	0.1217	0.11408	0.20146	0.18078	0.27635
10	0.10418	0.13947	0.16333	0.28896	0.11529	0.38659

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表 4 GH5188合金在不同变形条件下流变失稳判据ζ值

Table 4. Rheological instability criterion ζ value of GH5188 alloy under different deformation conditions

$ \dot{\mathrm{\epsilon }} $/s⁻¹	ζ
$ \dot{\mathrm{\epsilon }} $/s⁻¹	980 ℃	1030 ℃	1080 ℃	1130 ℃	1180 ℃	1230 ℃
0.01	−0.05577	−0.04705	−0.05663	−0.05045	−0.00074	−0.04567
1	−0.03844	−0.02314	−0.00647	0.08102	−0.06442	0.10418
5	0.03598	0.01975	0.09698	0.12356	−0.14983	0.12158
10	0.05094	0.0318	0.09292	0.10252	−0.28007	0.09796

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