Effect of precipitates on the creep rupture behavior of GH4141 superalloy
This study focused on the effect of precipitates on the creep rupture behavior of GH4141 su-peralloy,involving creep crack initiation and propagation.Microstructures including carbides,γ'precip-itate hardening phase,void and intergranular crack were characterized by SE and EBSD.Meanwhile,plastic deformation and hardening mechanisms for crystal grains were analyzed.Voids occurred at the interfaces of grain boundary and carbides.Voids coalescence with wavy morphology were observed.The increase in crack length enhanced plastic deformation degree in front of the crack tip.The crystal grain strengthening was caused by the suppression of dislocation motion resulting from γ'pinning ef-fect.Due to the activation of multiple glide systems,dislocation piled up and tangled to enable crystal grain strengthening.
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