As a typical solid-state joining technology

the linear friction welding (LFW) process has gradually been the key manufacturing technology of bladed discs in advanced aircraft engines because of its advantages of environmental friendly

high efficiency and high quality. In linear friction welding process

the mechanical energy was transformed to heat energy by means of alternative friction

and make the materials reach to the plastic state and be welded

in which

thermomechanical coupling is the basis of the linear friction welding process and determines the microstructures and properties of the joint. The inherent characteristics of thermo-mechanical coupling behavior in LFW

and the corresponding numerical simulation methods are introduced

and a more comprehensive literature review of the state-of-the-arts of thermomechanical coupling of the LFW process is summarized

which can provide the guidelines for the studies on thermomechanical coupling behaviors in LFW. Finally

the problems and development prospects of numerical simulation of thermo-mechanical coupling in LFW are discussed to provide some ideas for the future research.