Effects of Solution Temperature on Microstructure and Tensile Properties of a Novel Ni-Co-Based Wrought Superalloy

Tian Peiyu; Wang Mingshi; Li Xinyu

doi:10.20057/j.1003-8620.N250543

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Effects of Solution Temperature on Microstructure and Tensile Properties of a Novel Ni-Co-Based Wrought Superalloy

Forming and Phase Transition | 更新时间：2025-11-06

- Effects of Solution Temperature on Microstructure and Tensile Properties of a Novel Ni-Co-Based Wrought Superalloy
- Special Steel Vol. 46, Issue 6, Pages: 142-148(2025)
- 作者机构：
  
  1.宝武特种冶金有限公司，上海200940
  2.北京钢研高纳科技股份有限公司，北京100080
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N250543
  CLC： TG113
- Received：18 September 2025，
  
  Revised：2025-10-04，
  
  Accepted：09 October 2025，
  
  Published：30 November 2025
- 稿件说明：
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田沛玉,王旻石,李新宇.固溶温度对一种新型镍钴基变形高温合金组织和拉伸性能的影响[J].特殊钢,2025,46(06):142-148.

Tian Peiyu,Wang Mingshi,Li Xinyu.Effects of Solution Temperature on Microstructure and Tensile Properties of a Novel Ni-Co-Based Wrought Superalloy[J].Special Steel,2025,46(06):142-148.
田沛玉,王旻石,李新宇.固溶温度对一种新型镍钴基变形高温合金组织和拉伸性能的影响[J].特殊钢,2025,46(06):142-148. DOI： 10.20057/j.1003-8620.N250543.

Tian Peiyu,Wang Mingshi,Li Xinyu.Effects of Solution Temperature on Microstructure and Tensile Properties of a Novel Ni-Co-Based Wrought Superalloy[J].Special Steel,2025,46(06):142-148. DOI： 10.20057/j.1003-8620.N250543.

摘要

研究了一种涡轮盘用新型镍钴基变形高温合金的组织和拉伸性能。该合金采用三联冶炼+快径锻联合+热处理工艺制备。在1 090~1 140 ℃固溶温度下分别进行室温、650、750、815 ℃拉伸试验。结果表明，随着固溶温度升高晶粒尺寸显著增加，而一次γ′相含量降低且尺寸减小，二次γ′相含量升高且尺寸增加。晶界一次γ′相的溶解消失是晶粒长大的主要原因。一次γ′相和三次γ′相溶解为二次γ′相粗化提供了溶质原子。不同固溶温度下，实验合金的室温拉伸断裂以穿晶断裂模式为主；在650 ℃时，固溶温度影响了断裂模式；在750、815 ℃下，主要为沿晶断裂。固溶温度引起的晶粒和γ′相的改变显著影响了合金的高温拉伸性能，对室温拉伸性能的影响较小。在1 130 ℃时，在各试验温度下，出现反屈服现象。高温拉伸性能的下降主要是由于晶界弱化导致的。

Abstract

This study examines the microstructure and tensile properties of a novel Ni-Co-based wrought superalloy for turbine disk applications.The alloy was fabricated through triple melting combined with combined rapid forging and radial forging process， and subsequent heat treatment process. Tensile tests were conducted at room temperature， 650 ℃， 750 ℃ and 815 ℃ following solution treatment within the temperature range of 1 090 ℃ to 1 140 ℃ and aging treatment. The results demonstrate that increasing the solution temperature significantly enlarges grain size while simultaneously decreasing both the content and size of primary γ′ precipitates. Conversely， the volume fraction and dimensions of secondary γ′ precipitates exhibit augmentation. The dissolution of grain-boundary primary γ′ phase predominantly contributes to grain coarsening. The solute atoms released from dissolved primary and tertiary γ′ phases facilitate the coarsening of secondary γ′ precipitates. For the experimental alloy， room-temperature tensile fractures predominantly exhibited transgranular failure across different solid-solution temperatures. At 650 ℃， variations in the solid-solution temperature altered the fracture mode， while intergranular fracture dominated at 750 ℃ and 815 ℃. The evolution of grain structure and γ′ precipitates induced by solid-solution treatments significantly affected elevated-temperature tensile properties but had limited influence on room-temperature performance. Inverse yielding occurred across all test temperatures following treatment at 1 130 ℃. The deterioration in high-temperature tensile properties primarily originated from grain boundary weakening.

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