Abstract
During forming operations, the microstructure of metal parts is usually changed. Effects of cold hardening result in different mechanical properties, whereas the deformed microstructure also changes the electromechanical properties. The latter is responsible inter alia for the chemical corrosion behavior in terms of breakdown potential. In this study, the principle of corrosion resistance of steel E355 (EN 10305-1) was analyzed after rotary swaging with the same nominal strain but different process settings. Especially higher feed rates (forming increments per stroke) and the additional application of shear strain by eccentric rotary swaging increased the pitting potential significantly and thus the corrosion resistance. The introduced methods are assumed as prospective candidates for industrial production of parts that provide higher durability without further anti-corrosion treatment.
Highlights
Rotary swaging is an incremental open-die forging process used for the production of lightweight components from tubular semi-finished products
A change in the process kinematic from conventional to eccentric rotary swaging resulted for the low feed rate and the not heat-treated workpiece in the double value of the roundness deviation
The rotary swaging led to a distorted grain structure while a prior heat treatment prevented this effect and in contrast resulted in enhanced grain growth
Summary
Rotary swaging is an incremental open-die forging process used for the production of lightweight components from tubular semi-finished products. In this process, the diameter of the components to be manufactured is reduced. During infeed rotary swaging, which is shown schematically, the incremental forming process takes place in a mainly radial direction. The radial stroke of the dies is generated by the passing of the base jaws (with the cam) on the cylindrical rollers. Due to the height of the pressure column, consisting of base jaw, intermediate plate and die, an individual closing pressure and a corresponding closing time are generated
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