Based on the orthogonal analysis,the hot compression bonding experiments were conducted on the 35CrMo bars using the Gleeble 3 500 equipment.Through using the elongation ratio obtained by tensile test at room temperature as criterion for healing quality and combining with the microstructural characterization,it showed that within the typical temperature range 1 000-1 200 ℃ for hot forging,the increase in compression amount is more critical than temperature to improve the healing quality,which could improve dynamic recrystallization and decrease porosity at joint interface.Holding temperature after compression only causes the grains grow,rarely affecting the porosity as well as healing quality.However,a small pressure during holding temperature after compression could cause creep,which could eliminate the residual pores,improving the healing quality.Analysis shows that the processing parameters beneficial to rapid atomic diffusion help obtain better healing quality due to the significant decrease of porosity and the conversion of atomic binding from physical to metallurgical manner.To reach the best healing quality,the optimized processing combination including a compression amount of 60％plus a maintaining pressure of 9 MPa during holding is recommended based on present experimental results.
hot compression bondingorthogonal experimentdynamic recrystallizationcreepatomic diffusion
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