Influence of the pulse duty cycle on the forming quality and properties of 316L additive parts
The pulse duty cycle has an important impact on the quality of formed parts,and optimizing this parameter can improve the forming quality of products.In this paper,the effects of varying the pulse duty cycle on the quality and properties of formed parts made from 316L austenitic stainless steel welding wire for wire and arc additive manufacturing are investigated.Related tests such as metallographic observation,hardness,tensile properties,and electrochemical corrosion properties are carried out on the additive parts.The results indicate that while the pulse duty cycle has a negligible effect on specimen hardness,it exhibits noticeable differences in mechanical and corrosion properties.At a pulse duty cycle of 50%,the tensile strength and total tensile strain of the specimen were the maximum,462 MPa and 35.0%respectively.The most excellent corrosion resistance is achieved at a duty cycle of 25%,with a minimum self-corrosion current density of 2.956×10-5 A/cm2.Conversely,with a duty cycle of 50%,the specimen have the highest self-corrosion current density of 3.853×10-5 A/cm2 and the worst corrosion resistance.
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