Microstructure, Flow and Work Hardening Behavior of Ni-Based Superalloy BZL12Y
摘要
The present work describes a correlation among microstructure, texture, flow and work hardening behavior during compression of the alloy BZL12Y. The microstructure in as-cast condition contains γ, γ' and MC type of carbides. The lattice parameter of both the γ and γ' phases reveals extensive solid solution. The 0.2 and 2.0% yield strength values observed in compression lie in the range of 725–767 and 846–900 MPa, respectively. Flow curves of the samples exhibit single (2% deformation)- and two-slope (4-10% deformation) behavior. The flow behavior of 2% deformed sample follows the Ludwik constitutive equation, while that of the 4 to 10% deformed samples is elucidated by Ludwigson constitutive equation. All the deformed samples have demonstrated three typical stages (I, II and III) of work hardening curves except 2% and 4% deformed sample. Deformation mechanism associated with present samples involves the frequent crossing of multiple slip systems as a result of active pileups of dislocations.