25-27 April 2022
Conventum Conference Center
Europe/Vienna timezone

Profile roller burnishing of stainless austenitic high interstitial steels for manufacturing of extruder screws

26 Apr 2022, 11:00
20m
Room 2

Room 2

Oral Presentation Microstructure, properties & performance Microstructure, Properties & Performance

Speaker

Dr Erik Forke (Chemnitz University of Technology)

Description

Extruder screws, as applied for example in plastics compounding or food industries, often require both wear and corrosion resistance. Therefore, the production process of these screws is divided up into shaping of geometry on the one hand and wear protection together with surface fine processing on the other hand. Recently developed FeCrMnCN stainless austenitic high interstitial steels (HIS) combine the advantageous corrosion resistance of conventional austenites with high strength and an intense work hardening capability. These steels can be produced at ambient pressure, whereby the sum of carbon and nitrogen content of about one mass-% is kept in solid solution. A forming procedure that combines the advantages of both profile rolling and roller burnishing has been developed to benefit from the strengthening of HIS. The local hardening within the screw subsurface is predicted by means of finite-element-simulation. Wear resistance of rolled axisymmetric specimen in a melt of glass-reinforced polypropylene was tested on a dedicated test stand. Repeated measurements indicate a hardness increase that would usually require quenching and tempering for conventional martensitic steels. Furthermore, the amount of wear of the mechanically hardened surface is comparable to that of nitrided steel. Hence, the results allow for drawing the conclusion that steel and forming procedure are suitable for components in corrosive media with moderate wear requirements.

Speaker Country Germany

Primary author

Dr Erik Forke (Chemnitz University of Technology)

Co-authors

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