Abstract
Rotary swaging is an incremental cold forming process to produce axisymmetric workpieces from rods and tubes. The process also induces changes of the microstructure of the material depending on the process parameters. This in turn influences the mechanical properties like hardness as well as the electrochemical properties. As a result of changed electrochemical properties, the passivity of the material and thus the corrosion behavior changes. In order to investigate the influence of rotary swaging on the corrosion behavior of the stainless steel AISI304, deformed micro parts are electrochemically analyzed. The measurements reveal a dependency of corrosion rate and impedance on both feed velocity and final diameter of the rotary swaging process. A higher feed velocity decreases the corrosion rate and increases the impedance indicating a better resistance against corrosion as a side effect of rotary swaging.
Highlights
Rotary swaging is an incremental cold forming process to produce axisymmetric workpieces from rods and tubes
The grain size of AISI 304 decreases with every deformation stage and straininduced martensite is built during the process
It could be shown that the martensite content increases with increasing deformation while an increasing feed velocity can decrease the amount of formed martensite
Summary
Rotary swaging is an incremental cold forming process to produce axisymmetric workpieces from rods and tubes. Processes like rotary swaging, which cause mechanical deformation on the microscale, can induce a transformation of this austenitic stainless steel into martensite. This change of microstructure influences the mechanical behavior of the produced workpieces [4]. By rotary swaging the grain size of the material decreases while the martensite content in stainless steel increases [5, 7]. Both phenomena influences the passivity of the material. The additional electrochemical measurements reveal the dependency of both material parameters and process parameters on the corrosion behavior
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