• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Investigation of microstructure evolution and mechanical properties of multi-precipitation Ni-Co base superalloys
【24h】

Investigation of microstructure evolution and mechanical properties of multi-precipitation Ni-Co base superalloys

机译：多沉淀Ni-Co基超合金组织演化与力学性能的研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The microstructure evolution and mechanical properties were investigated in a multi-precipitation Ni-Co base superalloy system with different chemical compositions (wt. %) of Ni_(30)-Co_(33)-C_(0.022) (1#) and Ni_(28.5)-Co_(34.5)-C_(0.01) (2#). The interaction of multi-precipitates and its influence on the creep behavior were studied in correlation with the evolution of deformed microstructure. The multi-precipitates mainly consist of γ′-Ni_3Al phase, β-NiAl phase, carbides, and η phase. After a long term aging, both of the β and γ′ phase possess a strong thermal stability in the two superalloys, while the number density of η precipitates has increased a lot (volume fraction: 0.02%-0.21%) in the 2# Ni-Co alloys compared with that in the 1# Ni-Co alloys. The room temperature mechanical properties of both Ni-Co alloys almost remain stable such as ultimate tensile strength (1260-1280 Mpa) and total elongation (22-24%) even after a long aging time of 1500 h. However, different from the stress-free aging process, the γ′ precipitate in the 2# Ni-Co alloy shows a higher rafting rate compared with that in the 1# Ni-Co alloy after the creep (903 K, 450 Mpa) for 500 h. Thus, the 2# Ni-Co alloy exhibits a significantly higher creep strain rate and an advanced accelerating creep stage than the 1# Ni-Co alloy. The differences of the creep properties are mainly attributed to a change in deformation mechanism from dislocation gliding to dislocation climbing over the rafted γ′ phase during the steady-state stage. A high stacking fault energy (SFE) of the matrix results in strong stress concentration and dislocation network formation in the γ/γ′ interfaces, contributing to an accelerated creep strain rate of the 2# Ni-Co alloy. In contrast, sustainable precipitation hardening from spherical MC carbides can delay the steady-state stage to a very long life until 1500 h in the 1# Ni-Co alloy.
机译：在多沉淀的Ni-Co碱基超合金系统中研究了微观结构演化和机械性能，其中Ni_（30）-CO_（33）-C_（0.022）（1＃）和Ni_（ 28.5）-CO_（34.5）-C_（0.01）（2＃）。研究了多沉淀物的相互作用及其对蠕变行为的影响与变形微观结构的演化相关。多沉淀物主要由γ'-ni_3A1相，β-茚，碳化物和η相组成。在长期老化之后，两种β和γ'相在两个超合金中具有强大的热稳定性，而η沉淀物的数量密度在2＃Ni中增加了大量（体积分数：0.02％-0.21％） -CO合金与1＃Ni-Co合金相比。 Ni-Co合金的室温机械性能几乎保持稳定，例如最终拉伸强度（1260-1280MPa），即使在长老化时间为1500小时后，即使在长老化时间为1500小时后，总伸长率（22-24％）。然而，与无应力老化过程不同，2＃Ni-Co合金中的γ'沉淀物显示出较高的漂流速率与蠕变（903k，450MPa）后的1＃Ni-Co合金中的漂流速率相比500小时。因此，2＃Ni-Co合金表现出明显较高的蠕变应变速率和比1＃Ni-Co合金的先进加速蠕变阶段。蠕变性质的差异主要归因于稳态阶段在圆形γ'相位上沿着圆形γ'相位爬立到位错滑动的变形机制的变化。基质的高堆叠故障能量（SFE）导致γ/γ'界面中的强应力浓度和位错网络形成，有助于2＃Ni-Co合金的加速蠕变应变率。相反，来自球形MC碳化物的可持续沉淀硬化可以将稳态阶段延迟到1＃Ni-Co合金中的1500小时。

著录项

  • 来源
    《Materials Science and Engineering》 |2021年第13期|140333.1-140333.11|共11页
  • 作者

    Yu Li; Zhenjun Hong; Binggang Liu; Xiaoshuai Jia;

  • 作者单位

    Institute of Advanced Steels and Materiak School of Materiak Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Material Science and Engineering Shanghai Institute of Technology No. 100 Haiquan Road Fengxian District Shanghai China;

    Institute of Advanced Steels and Materiak School of Materiak Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Institute of Technology Inner Mongolia First Machinery Group Corporation Baotou 014030 China State Key Laboratory of Smart Manufacturing for Special Vehicles and Transmission System Baotou 014030 China;

    Institute of Advanced Steels and Materiak School of Materiak Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China;

    Institute of Advanced Steels and Materiak School of Materiak Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ni-Co base Superalloys; Creep rate; γ′ phase; Multi-precipitates; Aging;

    机译：Ni-Co基超合金;蠕变率;γ'阶段;多沉淀;老化;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号