Dynamic Mechanical Properties and Modified Johnson-Cook Model Considering Recrystallization Softening for Nickel-Based Powder Metallurgy Superalloys

Abstract

The material undergoes high temperature and high strain rate deformation process during the cutting process, which may induce the dynamic recrystallization behavior and result in the evolution of dynamic mechanical properties of the material to be machined. In this paper, the modified Johnson-Cook (J-C) model for nickel-based powder metallurgy superalloy considering dynamic recrystallization behavior in high strain rate and temperature is proposed. The dynamic mechanical properties of the material under different strain rates and temperature conditions are obtained by quasi-static compression test and split Hopkinson pressure bar (SHPB) test. The coefficients of the modified J-C model are obtained by the linear regression method. The modified model is verified by comparison with experimental and model prediction results. The results show that the modified J-C model proposed in this paper can accurately describe the mechanical properties of nickel-based powder metallurgy superalloys at high temperatures and high strain rates. This provides help for studying the cutting mechanism and finite element simulation of nickel-based powder metallurgy superalloy.

Dynamic Mechanical Properties and Modified Material Constitutive Model for Hot Forged Ti2AlNb over Wide Ranges of Temperature and Strain Rate

“…Many studies on the methods of establishing the J-C model have been conducted for nickel-based alloys and titanium alloys [ 11 , 12 , 13 , 14 ]. These current methods could guide the establishment of the J-C model of Ti 2 AlNb alloys.…”

“…The strain rate sensitivity coefficient was modified with a bivariate quadratic function of temperature and strain rate for the established J-C model of GH2132. Ling et al [ 14 ] established the J-C model considering recrystallization softening for nickel-based powder metallurgy superalloys. Lin et al [ 17 ] conducted experimental research on the mechanical behavior of 5A06 aluminum alloy in three different processing and heat treatment states at 25–500 °C and strain rates of 10 −4 –10 −3 s −1 .…”