This study focused on the additive manufacturing of single-pass multi-layer thin-walled samples using 316 stain-less steel.It explored three welding modes:cold metal transfer(CMT),cold metal transfer-pulse(CMT-P),and direct current-pulse(DC-P),and conducted a comparative analysis of the mi-crostructure and mechanical properties of the samples.Under the three modes of formation,the resulting components exhib-ited no collapse or macroscopic porosity.The solidified struc-ture consists predominantly of columnar dendritic crystals,along with a significant presence of secondary dendrites and cellular crystals.Upon conducting metallographic observation and utilizing electron back scatter diffraction(EBSD)techno-logy,it was determined that the structure demonstrates a pro-nounced<001>//z texture.The average spacing of dendrites in the steady-state zone of the component exhibits variation based on the heat input across different welding modes,with the pat-tern being CMT<CMT-P<DC-P.The matrix structure was identified as γ-Fe(Cr0.19Fe0.7Ni0.11)using X-ray diffraction(XRD)and scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS)analysis,while the interstitial net-work structure was found to be residual δ-Fe.In CMT-P mode,the component exhibits the highest strength,characterized by a yield strength of 237 MPa,a tensile strength of 555 MPa,and an average hardness value of 209 HV0.3.In the DC-P mode,the component exhibits the highest elongation at break,reach-ing 52%.
关键词
电弧增材制造/冷金属过渡焊/不锈钢/力学性能/显微组织
Key words
wire and arc additive manufacturing/cold met-al transfer/stainless steel/mechanical properties/microstruc-ture
维普
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