Study on forming process properties of 42CrMo materials via laser coaxial powder feeding process
42CrMo material is widely used in the manufacture of bolt fasteners.Poor service conditions of the material often lead to screw corrosion,thread failure and screw fracture.The laser coaxial powder feeding process was used to carry out the block forming test of 42CrMo material.Based on the optimization of single-channel forming test parameters,single-layer multi-channel forming test process analysis and block forming test performance test,the laser coaxial powder feeding process verification and performance characterization of 42CrMo steel were completed.The analysis showed that using laser power 1 800 W,scanning speed 13.33 mm/s,lap rate of 50％could achieve good forming of 42CrMo steel.The microstructure analysis showed that the microstructure of the cladding layer was compact and the bonding interface was good,showing a typical ferrite plus pearlite structure.The tensile test showed that the average tensile strength of laser formed 42CrMo steel was as high as 746 MPa,and the fracture was a typical ductile fracture.The research results could be used as a reference for laser large-scale forming of 42CrMo steel.
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