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Processing of polymers depends on corrosion‐ and wear resistant tool materials being in direct contact with the feedstock material. Plastic mold steels, a special group of tool steels, are successfully applied here, offering both a good wear and corrosion resistance. The lifetime of tools used for plastic processing not only depends on wear and corrosion resistance but also on the mechanical properties of the tool material for example, its flexural strength. In this work, mechanical tests of a commercial plastic mold steel were performed and related to the heat treatment. A close correlation of the amount of retained austenite and carbides and the mechanical properties was encountered. The paper discusses strategies to optimize the mechanical properties by an adequate heat treatment with regard to the resulting corrosion and wear resistance.

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Friction welding is introduced as one of the most economical, simple and productive welding methods. Improvement of the fatigue life of friction welded joints attracted significant interest. In the present work, commercial pure titanium (cp-Ti) specimens were joined by continuous drive friction welding process. The process parameters were varied to a wide extent to find out the optimum operating parameters. The welded joints were then mechanically surface treated by either shot peeing (SP) or roller burnishing (RB) to evaluate the influence of these surface treatments on the surface layer properties, fatigue performance, as well as the corrosion resistance. The results indicated a marked enhancement in the fatigue performance of the friction welded joints after SP and RB due to the induced compressive residual stresses that compensate welding tensile residual stresses at the weld.