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“γ′相+孪晶”复合结构对高温合金强度及塑性的影响
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作者单位:

兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室

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中图分类号:

TG146.1

基金项目:

国家重点研发计划项目No.2017YFA0700703,国家自然科学基金项目No.51661019,甘肃省科技重大专项项目No.145RTSA004和镍钴资源综合利用国家重点实验室基金项目No.301170503,兰州理工大学红柳一流学科建设计划项目


Effect of “γ′ phase and Twin” Composite Structure on Strength and Plasticity of Superalloy
Author:
Affiliation:

State Key Laborary of Advanced Processing and Recycling of Nonferrous Metels,Lanzhou University of Technology

Fund Project:

National Key Research and Development Program of China (No.2017YFA0700703), National Natural Science Foundation of China (No.51661019), Program for Major Projects of Science and Technology in Gansu Province (No.145RTSA004), Program for Hongliu first-class discipline construction plan of Lanzhou?University?of?Technology

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    摘要:

    本文通过调控低合金化、低层错能的Ni-Cr-Co基变形高温合金的“γ′相+孪晶”复合结构,分析了孪晶界对晶粒细化和强度提高的贡献以及复合结构对合金强塑性的影响。结果表明,合金在1090 ℃保温1 h的固溶处理后,锻态组织中粗大块状γ′相基本溶解,且此时组织中的孪晶含量高达51.65%。固溶态合金伸长率(42.9%)相比于锻态(26.8%)提升了63.6%,屈服强度为693 MPa(相比于锻态仅下降了3%),其中σ tb=66.98 MPa,其贡献度基本和细晶强化的程度(77.4 MPa)持平。将固溶态合金经700 ℃/8 h/AC处理后的时效态合金孪晶含量为34.41%,同时组织引入大量沉淀强化相γ′相,构成“γ′相+孪晶”复合结构,此时时效态合金硬度、抗拉强度、屈服强度与伸长率(405 Hv,1042 MPa,864 MPa,49.76%)相较于固溶态(324.4 Hv,879 MPa,693 MPa ,42.9%,)均得到进一步提高,其中σ tb=107.94 MPa。低合金化、低层错能的高温合金中的“γ′相+孪晶”复合结构实现了一定的强塑性匹配。

    Abstract:

    In this paper, different treatments were used to adjust the “γ′phase+twin” structure of a new Ni-Cr-Co based wrought superalloy, which was low alloying and low stacking fault energy. The contribution of twin boundary to grain refinement, strength improvement and the effect of the “γ′phase+twin” structure on the mechanical properties of the alloy were analyzed. The results show that after solution treatment at 1090 ℃ for 1 h, the γ′precipitates in the microstructure of the forged alloy is basically dissolved, and the content of twins in the structure is as high as 51.65%. The elongation (42.9%) of the solid solution alloy is 63.6% higher than that of the forged alloy (26.8%), and the yield strength is 693 MPa (only 3% lower than that of the forged alloy) σ tb = 66.98 MPa, and its contribution is basically the same as that of fine grain strengthening (77.4 MPa). The content of twins of the aged alloy treated by 700 ℃ / 8 h / AC is 34.41%, at the same time, a large amount of γ′ phase, which is precipitation strengthening phase, is introduced into the structure, and form the“ γ′phase + twin" composite structure. The hardness, tensile strength, yield strength and elongation of the aged alloy (405 HV, 1042 MPa, 864 MPa, 49.76%) are further improved compared with those in the solid solution state (324.4 HV, 879 MPa, 693 MPa, 42.9%) , and σ tb=107.94 MPa. In superalloys with low alloying and

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丁雨田,张霞,高钰璧,陈建军,张宝兵,马元俊.“γ′相+孪晶”复合结构对高温合金强度及塑性的影响[J].稀有金属材料与工程,2022,51(10):3732~3742.[Ding Yutian, Zhang Xia, Gao Yubi, Chen Jianjun, Zhang Baobing, Ma Yuanjun. Effect of “γ′ phase and Twin” Composite Structure on Strength and Plasticity of Superalloy[J]. Rare Metal Materials and Engineering,2022,51(10):3732~3742.]
DOI:10.12442/j. issn.1002-185X.20210786

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  • 收稿日期:2021-09-03
  • 最后修改日期:2021-10-21
  • 录用日期:2021-11-05
  • 在线发布日期: 2022-11-01
  • 出版日期: 2022-10-28