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Surfacing techniques for advanced ledeburitic steel and hard materials

Ledeburitic steels prepared using the rapid solidification
effect, as well as those with the addition of ceramic
particles, will be developed. The coating of final steel
and hard materials will be investigated.

Over the last two decades, rapid solidification (RS) techniques have facilitated the industrial use of a large number of tool materials. The main reason for the wide application of RS techniques in Industry is the significant improvement of such produced materials because: 1) RS leads to a rapid extension in solid solubility of metallic materials which results not only in excellent chemical homogeneity, but also a marked refinement of structural components after consolidation. 2) Moreover, RS also overcomes other problems during the preparation of ledeburitic steels such as the occurrence of carbide bands, segregation in large casting and reduced formability in cases of high vanadium- containing cold work steels. 3) Powder Metallurgy (P/M) routes, where RS is included, enable an additional mechanical alloying through the addition of various amounts of hard as well as soft particles. 4) Surfacing the ledeburitic steels as well as hard alloys and composite materials using techniques such as PVD (Physical Vapour Density), ESA (Electrospark Alloying), TRESS (Thermoreactive Electrospark Surface Strengthening) enables a significant improvement to be made in the wear and thermal resistance of various tools, e.g. stamps, punches, rollers, press forms, moulds, dies, cutting tools, etc. Thus, new certified composite electrodes and targets, e.g. TiB-Ti, TiB2-Ti5Si3-Si, Ti3SiC2-TiC, TiC-NiAL, TiC-Cr3C2-Ni, TiC-Mo2C, TiC-Mo2C-Tac all produced by Self-Propagating High Temperature Synthesis (SHS) method will be used in the research and development. The aim of this EUREKA project is to investigate and develop new high alloy tool steels and the processing routes for their preparation and surface strengthening. The ledeburitic type steels with enhanced volume fraction of solidification generated hard carbides, as well as those prepared by different P/M methods (admixing of various amounts of ceramic particles with different shape and size), and the development of related surfacing techniques will be subject to the research and development work. The influence of solidification conditions on the main characteristics of RS material will be evaluated within the framework of this project. Based on the experimental results obtained, the relationships between structural parameters, as well as properties and densification parameters (temperature, pressure, atmosphere) will be investigated. The study of the mechanism and kinetics of densification will also be included. The heat as well as surface treatment of the materials developed will also be investigated. There is a possibility of applying the new vacuum heat treatment methods (hardening, tempering) on these materials so that these techniques can be evaluated especially. Surface treatment methods (i.e. plasma nitriding, magnetron sputtering, ion implantation, ESA, TRESS) will be investigated on heat-treated steels. As is well known, plasma nitriding can be successfully applied to increase surface hardness, wear resistance and other characteristics. Moreover, these techniques make it possible to obtain well defined surface layers which, because of their thickness, phase constitution and hardness, are closely related to the processing parameters. Hard coatings using various PVD methods (TiN, TiCN, TiBN, TiBSiN, CrN or combined coatings - so-called "sandwiches") will be investigated on the heat treated as well as the plasma nitrided ledeburitic steels. Moreover, the new coatings prepared by IBAD techniques obtained on the steel surface will be studied. Keywords: ledeburitic steel, powder metallurgy, surface techniques.
Acronym: 
SURTELEM
Project ID: 
2 060
Start date: 
01-01-1999
Project Duration: 
36months
Project costs: 
790 000.00€
Technological Area: 
Market Area: 

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.