首页|Multi-scale modeling for prediction of mechanical performance in brazed GH99 thin-walled structure

Multi-scale modeling for prediction of mechanical performance in brazed GH99 thin-walled structure

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Superalloy thin-walled structures are achieved mainly by brazing,but the deformation process of brazed joints is non-uniform,making it a challenging research task.This paper records a thorough investigation of the effect of brazing parameters on the microstructure of joints and its mechanical properties,which mainly inquires into the deformation and fracture mechanisms in the shearing process of GH99/BNi-5a/GH99 joints.The macroscopic-microscopic deformation mech-anism of the brazing interface during shearing was studied by Crystal Plasticity(CP)and Molecular Dynamics(MD)on the basis of the optimal brazing parameters.The experimental results show that the brazing interface is mainly formed by(Ni,Cr,Co)(s,s)and possesses a shear strength of approximately 546 MPa.The shearing fracture of the brazed joint occurs along the brazing seam,displaying the characteristics of intergranular fracture.MD simulations show that dislocations dis-associate and transform into fine twinning with increased strain.CP simulated the shear deforma-tion process of the brazed joint.The multiscale simulation results are consistent with the experimental results.The mechanical properties of thin-walled materials for brazing are predicted using MD and CP methods.

Multi-scale modelingBrazingShear mechanismsCrystal plasticityGH99 superalloy

Yazhou LIU、Shengpeng HU、Yanyu SONG、Wei FU、Xiaoguo SONG、Ning GUO、Weimin LONG

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State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China

Shandong Institute of Shipbuilding Technology,Weihai 264209,China

China Machinery Intelligent Equipment Innovation Research Institute(Ningbo)Co.,Ltd.Ningbo 315700,China

National Natural Science Foundation of ChinaTaishan Scholars Foundation of Shandong ProvinceNatural Science Foundation of Shandong ProvinceNatural Science Foundation of Shandong Province

52175307tsqn201812128ZR2023JQ021ZR2020QE175

2024

10.1016/j.cja.2024.01.010

中国航空学报(英文版)
中国航空学会

中国航空学报(英文版)

CSTPCDEI
影响因子：0.847
ISSN：1000-9361
年,卷(期)：2024.37(7)
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