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Investigation on precipitation phenomena and mechanical properties of Ni-25Cr-20Co alloys aged at high temperature

机译：Ni-25Cr-20Co高温时效时析出现象和力学性能的研究

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摘要

The evolution of carbides and the coarsening behavior of L1(2) ordered gamma' phase in Ni-25Cr-20Co alloys aged for varying time from 1000 to 5000 h at 700 and 750 degrees C were discussed in this paper. The mechanical properties of the alloys after aging were also discussed. Due to the changing of predominated resistance factor, a few of the gamma' precipitates' shape changed from spherical to cuboidal after aging at 750 degrees C for 3000 h. The sizes and volume fraction of the gamma' precipitates were measured after aging at both temperatures. The experimentally determined temporal exponent of the gamma' coarsening indicated that the coarsening kinetics is in accordance with both models: the classical matrix diffusion LSW model and the trans-interface diffusion-controlled model. Additionally, the coarsening rate of the gamma' precipitates is dominated by the diffusion coefficients of Nb based on the classical LSW model. Furthermore, the yield strength curves of the alloys aged at 700 degrees C showed different trends at both test temperatures which is related to the influence of gamma' coarsening on the critical resolved shear stress.
机译：本文讨论了在温度为700和750℃，时间从1000到5000 h时效不同的Ni-25Cr-20Co合金中，碳化物的演化和L1（2）有序gamma'相的粗化行为。还讨论了时效后合金的机械性能。由于主要阻力系数的变化，一些γ'沉淀物的形状在750摄氏度下老化3000小时后从球形变为长方体。在两个温度下老化后，测量γ′沉淀的尺寸和体积分数。实验确定的伽马粗化的时间指数表明，粗化动力学符合两种模型：经典矩阵扩散LSW模型和跨界面扩散受控模型。此外，基于经典LSW模型，γ'沉淀的粗化速率主要由Nb的扩散系数决定。此外，在两种测试温度下，在700℃时效的合金的屈服强度曲线均显示出不同的趋势，这与γ'粗化对临界解析剪切应力的影响有关。

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  • 来源
    《Journal of Materials Research》 |2018年第20期|3479-3489|共11页
  • 作者

    Wei Limin; Wang Shuo; Yang Quan; Cheng Yi; Tan Shuping;

  • 作者单位

    Harbin Boiler Co Ltd, Mat Res Inst, Harbin 150046, Heilongjiang, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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