Anomalous enhancing effects of electric pulse treatment on strength and ductility of TC17 linear friction welding joints

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外文摘要：Mechanical properties of TC17 titanium alloy undergo a significant reduction after linear friction welding(LFW),of which the strength and ductility are hard to be improved simultaneously by traditional aging heat treatment(AHT),seriously limiting the application of LFW in the manufacturing of TC17 titanium alloy blisks.To this end,the present work proposes to use electric pulse treatment(EPT)to enhance the strength and ductility of TC17 LFW joints simultaneously by improving its microstructure.The results show that,in comparison to the uneven distribution of α phases in the welding zone(WZ),heat-affected zone(HAZ),and base metal(BM)zone after AHT,EPT can selectively homogenize the α phase distribution of WZ and HAZ without impacting the BM.The selective effect of EPT is reflected as the synergistic influence of the local Joule heating effect and the electron wind effect,which promotes the diffusion of β phase stabilizing element Mo and leads to a competitive precipitation of β phase and α phase in the α phase transition temperature range.The ratio of α phase to β phase in the WZ and HAZ finally approaches an equilibrium point which is similar to that of BM,leading to a uniform distribution ofα phase and realizing the synergy of strength-ductility of LFW joint:the maximum strength increase observed is 12.9％,accompanied by a corresponding elongation increase of 122％(by AHT & EPT),and the maximum plasticity improvement is 185％,accompanied by a corresponding strength increase of 4.3％(by EPT for 1 h).This study provides essential insights for improving the strength and ductility of LFW TC17 titanium alloy blisks and enhancing the applications of LFW in aeroengine components.

外文关键词：

Linear friction weldingTC17 titanium alloyElectric pulse treatmentPhase transformationLocal joule heating effect

作者：

Xin Zhang、Junjie Zhang、Yunkui Yao、Qingsong Qiao、Lixing Zhao、Leichang Liu、Feng Jin、Mei Zhan、Hongwei Li

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作者单位：

Key Laboratory of High-Performance Manufacturing for Aero Engine,Ministry of Industry and Information Technology,Northwestern Polytechnical University,Xi'an 710072,China

Engineering Research Center of Advanced Manufacturing Technology for Aero Engine,Ministry of Education,Northwestern Polytechnical University,Xi'an 710072,China

Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment,Northwestern Polytechnical University,Xi'an 710072,China

School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China

State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China

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出版年：

2024

DOI：

10.1016/j.jmst.2024.04.008

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.203(36)