Research on laser-induced arc additive manufacturing process and performance of high strength steel
The forming quality,interlayer structure and mechanical properties of multi-layer and multi-pass thin sample were studied by using high strength steel welding wire AFEW 6-86 as material by using low-power pulsed laser-induced arc-TIG are additive manufacturing method.The results showed that the surface forming quality of the low-power pulsed laser-induced arc-TIG arc additive manufacturing sample was good,the internal structure was dense and there were no obvious defects.The overall microstructure of the specimen was mainly granular bainite.Due to the different cooling rates at different positions of the sedimentary layer,the top layer had lath martensite,and the middle layer had acicular or feathery bainite.In terms of tensile properties,the tensile strength and elongation of the specimens in both transverse and longitudinal directions were different and anisotropic,and the tensile fractures in both directions were ductile fractures.In terms of microhardness,the stratification phenomenon decreased first and then increased from the bottom to the top,and the overall hardness value fluctuated between 350HV and 425HV.
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