TLP扩散焊接工艺参数对GH5188高温合金接头微观组织及力学性能的影响
收稿日期: 2023-06-20
修回日期: 2023-07-15
录用日期: 2023-10-10
网络出版日期: 2023-11-09
基金资助
国防科技重大专项(J2019-VII-0012);国家自然科学基金(52065048);先进焊接与连接国家重点实验室开放课题(AWJ-22Z02)
Effect of TLP diffusion welding process parameters on microstructure and mechanical properties of GH5188 superalloy joint
Received date: 2023-06-20
Revised date: 2023-07-15
Accepted date: 2023-10-10
Online published: 2023-11-09
Supported by
National Defense Science and Technology Major Project(J2019-VII-0012);National Natural Science Foundation of China(52065048);Project supported by the State Key Laboratory of Advanced Welding and Joining(AWJ-22Z02)
采用自主设计的KCo8钴基中间层对GH5188高温合金进行瞬间液相扩散连接，借助扫描电子显微镜（SEM）、能谱仪（EDS）及电子探针（EPMA）分析评估了瞬间液相扩散焊接工艺参数对接头微观组织的影响，探究了焊接工艺对接头的影响机理，采用电子万能试验机检测接头的力学性能进行评估并分析其断裂机理。结果表明，典型的接头主要由3种区域构成：GH5188合金（母材），M5B3、M3B2等析出相存在的扩散区和钴基固溶体构成的等温凝固区。扩散区的扩散行为与焊接工艺有关，随着焊接温度的升高或保温时间的延长，扩散区析出相的密集程度逐渐减小。最佳工艺参数为焊接温度1 180 ℃，保温60 min，接头平均抗拉强度为1 033 MPa，达到母材性能的96.5%，且断裂于母材，满足工程背景需求，并为GH5188 TLP扩散焊的广泛应用提供参考。
滕俊飞 , 李家豪 , 周惠焱 , 伍大为 , 徐海涛 , 林铁松 , 黄永德 . TLP扩散焊接工艺参数对GH5188高温合金接头微观组织及力学性能的影响[J]. 航空学报, 2024 , 45(8) : 429205 -429205 . DOI: 10.7527/S1000-6893.2023.29205
The transient liquid phase diffusion bonding of GH5188 superalloy is carried out by using self-designed KCo8 cobalt-based interlayer. The effects of transient liquid phase diffusion welding process parameters on the microstructure of the joint are evaluated by means of Scanning Electron Microscope （SEM）， Energy Dispersive Spectrometer （EDS） and Electron Probe Micro-Analyzer （EPMA）. The influence mechanism of welding process on the joint is explored. Moreover， the mechanical properties of the joint are evaluated by electronic universal testing machine， and the fracture mechanism is analyzed. The results show that the typical joint is mainly composed of three regions： GH5188 alloy （Base Metal）， diffusion zone of precipitated phases such as M5B3 and M3B2， and isothermal solidification zone composed of cobalt-based solid solution. The diffusion behavior of the diffusion zone is related to the welding process. With the increase of the welding temperature or the prolongation of the holding time， the density of the precipitated phase in the diffusion zone gradually decreases. The optimum process parameters are welding temperature of 1 180 ℃ and holding time of 60 min. The average tensile strength of the joint is 1 033 MPa， which is 96.5% of the base metal， and is broken in the base metal， meeting the needs of the engineering background. This study provides a reference for the wide application of GH5188 TLP diffusion welding.
Key words： GH5188 alloy; TLP; welding process; microstructure; mechanical properties
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