首页|Improvement for creep strength of a second-generation single crystal superalloy by design of heat treatments

Improvement for creep strength of a second-generation single crystal superalloy by design of heat treatments

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
Design of heat treatments is related to the key technology for development of nickel-based single crystal superalloys(Ni-SXs).Based on the full understanding of the solidification characteristics,this work applies opti-mization design of heat treatments for a second-generation Ni-SX.Microstructure evolution and creep properties are compared in the material under conventional/standard(Std.)and optimized(Opt.)treatments.For the Std.sample,strong dendritic segregations determine inconsistent microstructure evolution in the dendritic(D)and inter-dendritic region(ID),while the latter serves as weak area to have the prior microcrack initiation,damaging overall performance of the alloy.The Opt.treatment applies higher homogenization temperature,leading to overall reduced segregations,while not inducing incipient melting.A lower temperature of first-step ageing is used to lower the size of γ'particles.These help to form the more uniform microstructure in dendritic and interdendritic region and relieve the inconsistent microstructure evolution.The bal-anced local strength makes ID no longer as the weak area,thus restricting microcrack initiation.Great improvement of high temperature and low stress property is obtained by this progress,leading to the pronounced increase of creep rupture life under 1100 ℃/140 MPa.

Single crystal superalloyHeat treatmentSegregationSolidificationCreep property

Wan-Shun Xia、Xin-Bao Zhao、Jia-Chen Xu、Quan-Zhao Yue、Qing-Qing Ding、Huan-Chang Duan、Yue-Feng Gu、Hong-Bin Bei、Ze Zhang

展开 >

Institute of Superalloys Science and Technology,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China

State Key Laboratory of Silicon and Advanced Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China

National Natural Science Foundation of ChinaKey Basic Research Program of Zhejiang ProvinceZhejiang Provincial Natural Science Foundation of ChinaZhejiang Provincial Natural Science Foundation of ChinaNational Science and Technology Major Project of ChinaFundamental Research Funds for the Central Universities

919602012020C01002LR22E010003Q23E010029J2019-Ⅲ-0008-0051226-2022-00050

2024

10.1007/s12598-023-02361-6

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(1)
  • 47