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首页> 外文期刊>Materials Science and Engineering >Evolution of microstructure and tensile properties during solution treatment of nickel-based UNS N10276 alloy
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Evolution of microstructure and tensile properties during solution treatment of nickel-based UNS N10276 alloy

机译：镍基UNS N10276合金固溶处理过程中显微组织和拉伸性能的演变

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摘要

Influence of solution treatment (ST) on microstructure evolution and mechanical behavior of nickel-based UNS N10276 alloy were investigated by a variety of techniques such as optical metallography, scanning electron microscopy, transmission electron microscopy and tensile testing. The average grain size remained almost unaffected by hold time at 1050 ℃, resulting from the pinning effect of secondary phase on the grain boundary. A sharp increase in grain size and grain growth rate was observed with increasing solutionizing temperature up to 1150 ℃ irrespective of hold time, which was mainly related to the complete dissolution of precipitated particles as well as to the enhanced diffusion of solute atoms. The rate of grain growth reduced with extending solutionizing time and decreasing temperature. Flow curve parameters based on Ludwigson equation for the alloy after heat treatment were determined. The dissolution of secondary phase particles, combined with the grain growth, increased the work hardening exponent (n) and dramatically improved the tensile ductilities (TD), but reduced the tensile strengths (TS) to large extent. Both TD and n monotonically increased with increasing solutionizing temperature and prolonging hold time as the alloy was solutionized beyond 1100 ℃, while the TS and strain hardening rate (SHR) showed a reverse varying trend to that of TD and n. As the heat treatment was performed at 1050 ℃, tensile properties were not monotonically changing with hold time, which is associated with the increase in amount of precipitates and with the Ostwald ripening of precipitated particles. On the basis of Hall-Petch relation and experimental data, the mathematical relationships between tensile properties and grain size of the alloy solutionized at temperatures higher than 1150 ℃, were obtained by linear regression analysis. The Hall-Petch strengthening coefficient for yield strength of the UNS N10276 alloy was estimated to be 18.35 MPa mm~(1/2).
机译：通过光学金相，扫描电子显微镜，透射电子显微镜和拉伸试验等多种技术研究了固溶处理（ST）对镍基UNS N10276合金组织演变和力学行为的影响。平均晶粒尺寸几乎不受保持在1050℃的时间的影响，这归因于第二相在晶界上的钉扎效应。固溶温度升高至1150℃时，无论保持时间如何，晶粒尺寸和晶粒生长速率均急剧增加，这主要与沉淀颗粒的完全溶解以及溶质原子的扩散增强有关。随着固溶时间的延长和温度的降低，晶粒的生长速率降低。根据Ludwigson方程，确定了合金在热处理后的流动曲线参数。次生相颗粒的溶解与晶粒的生长相结合，增加了加工硬化指数（n），并显着改善了拉伸延展性（TD），但在很大程度上降低了拉伸强度（TS）。随着固溶温度的升高和固溶时间的延长，1100℃以上时TD和n均单调升高，而TS和应变硬化速率（SHR）与TD和n呈相反的变化趋势。在1050℃进行热处理后，拉伸性能不会随保持时间单调变化，这与析出物的增加和析出颗粒的Ostwald成熟有关。根据Hall-Petch关系和实验数据，通过线性回归分析，得出了在高于1150℃的温度下固溶的合金的拉伸性能与晶粒尺寸之间的数学关系。据估计，UNS N10276合金的屈服强度霍尔-帕奇强化系数为18.35 MPa mm〜（1/2）。

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  • 来源
    《Materials Science and Engineering》 |2017年第29期|335-347|共13页
  • 作者

    Enxiang Pu; Wenjie Zheng; Zhigang Song; Ke Zhang; Feng Yang; Hengchang Lu; Han Dong;

  • 作者单位

    School of Materials Science and Engineering Tsinghua University, Beijing 100084, China,Central Iron and Steel Research Institute, Beijing 100081, China;

    Central Iron and Steel Research Institute, Beijing 100081, China;

    Central Iron and Steel Research Institute, Beijing 100081, China;

    School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243032, China;

    Central Iron and Steel Research Institute, Beijing 100081, China;

    Central Iron and Steel Research Institute, Beijing 100081, China;

    Central Iron and Steel Research Institute, Beijing 100081, China;

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  • 正文语种 eng
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  • 关键词

    Solution treatment; Grain growth; Tensile properties; Work hardening; UNS N10276 alloy;

    机译：固溶处理;谷物生长;拉伸性能;工作硬化;UNS N10276合金;

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