Research Progress of Solution Treatment in Nickel-based Superalloys
Author of the article:QIANG Junfeng;MEI Zihan;YU Zhuhuan;LIU Beilei;FEI Zhenbao
Author's Workplace：School of Materials Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China
Key Words：Ni-base superalloy solution heat treatment solidified microstructure element segregation mechanical properties
Abstract：With the increasing of the service temperature of nickel-based superalloy,the increasing of the content of refractory elements made the treatment of solid solution more difficult.In order to formulate the best heat treatment system more effectively,the effects of solid solution treatment on solidification structure,element segregation and mechanical properties of nickel-based superalloy were comprehensively analyzed.The results show that the homogenization treatment can increase the initial melting temperature of the alloy.Increasing the solid solution temperature,prolonging the solid solution time and increasing the solid solution processing steps can significantly reduce the segregation of alloying elements,reduce the volume fraction ofγ/γ′eutectic structure and TCP phase,change the carbide into a more stable type,and reduce the volume fraction of residual alwaysγ′phase.However,the effect of different solid solution treatment processes on the size and volume fraction of the bulk phase precipitated from different alloys is still different,so different alloys need to be studied separately.Both the slope solid solution treatment and remelting solid solution treatment are proposed to ensure that the temperature of solid solution treatment can be increased as far as possible under the condition that there is no primary melt tissue,so that the distribution of elements can be more uniform,and the residual segregation can be smaller than that of the traditional gradual solid solution treatment,thus significantly increasing the durable life.Finally,the influence mechanism of solid solution treatment on microstructure and mechanical properties of alloys was reviewed,and the future research direction was pointed out.
