Experiments have indicated that:
gas lenses can be used with high power beams to reshape the beam laser;
the extent of the beam reshaping is understood and calculations can be made for any gas structure;
when 2 copper domes were constructed to collect laser radiation reflected from the treated metal surfaces, the systems efficiency was good, permitting 60-70% of the total energy to be absorbed without use of photoabsorbed coating;
curves of isodepth of transformation hardening treatment are available for pearlistic cast iron and iron steel;
tempering zone of transformation hardening treatment does not depend on the percentage of overlap.
This work has shown that the successful application of lasers for the surface treatment of industrial components requires a detailed knowledge of both the process technology and the laser beam metal interactions. A comprehensive understanding of both these issues has been achieved.
A range of industrial components has been treated using the optimized process conditions and the parts evaluated under conditions representative of their normal operating environments.
A number of the laser treatments showed a significant improvement in performance after processing and the likely levels of improvement in the life of the treated parts can be estimated.
THE OBJECTIVES ARE:
- TO CREATE NEW SURFACES WITH NEW ALLOY SYSTEMS USING LASER TREATMENT ON SIX METALLIC SUBSTRATES OF SG CAST IRON, LOW ALLOY STEEL, STAINLESS STEEL, A 7000 SERIES ALUMINIUM ALLOY TITANIUM ALLOY, AND INCONEL SUPERALLOY. THE ALLOY SYSTEMS TO BE STUDIED ARE:
- HS STEEL ON MILD STEEL AND SG IRON, VARIANTS OF NCB ON TITANIUM, SINI ON ALUMINIUM,
- PARTICLE INJECTION OF TIC AND SIC ON MILD STEEL AND SG IRON, TIC AND AL2O3 ON TITANIUM, AND AL2O3 AND SIC ON ALUMINIUM,
- CLADDING OF NI AND CO ON STEEL, ALUMINIUM AND TITANIUM.
- CHARACTERISE THESE SURFACES TREATMENTS AND RELATE MICROSTRUCTURE TO PROPERTIES OF THE SURFACES (WEAR, FATIGUE AND CORROSION RESISTANCE).
- APPLY OPTIMISED LASER SURFACE TREATMENTS TO INDUSTRIAL CASE STUDIES, - AUTOMOTIVE COMPONENTS: ROCKER ARMS, CAMSHAFTS, PUSHRODS
- NUCLEAR COMPONENTS: STEAM TUBES, STEAM VALVES, STEAM TURBINE BLADES, NOZZLES
- AERONAUTICAL COMPONENTS: RIBBED FLAP GUIDES, THROUGH HOLES, CLOSURE MECHANISM PINS, STATORS, TURBINE BLADES.
- ADAPT LASER TOOLING TO 3D TREATMENT HANDLING AND MONITORING. TARGETS TO BE REACHED ARE BEAM POSITION + 0.2 MM, POWER DENSITY + 5 %, MAXIMUM TABLE SPEED 20M/MIN.
- IMPROVE SURFACE CHARACTERISTICS OF THESE INDUSTRIAL COMPONENTS: - FOR CAST IRON AND MILD STEEL, IMPROVEMENT AIMED FOR IS AT LEAST 50 % OF SERVICE LIFE, COMPARED TO CONVENTIONAL SURFACE TREATMENTS (TIG GLAZING, CARBURIZING),
- FOR ALUMINIUM AND TITANIUM ALLOYS THE IMPROVEMENT OF WEAR RESISTANCE AIMED FOR IS A FACTOR OF BETWEEN 2 AND 10,
- FOR NICKEL ALLOY SURFACES, REACH EQUIVALENT VALUES OF WEAR AND CORROSION RESISTANCE OF CURRENTLY-USED STELLITE ALLOYS, TO ELIMINATE THE USE OF COBALT.
Funding SchemeCSC - Cost-sharing contracts
00060 Santa Maria Di Galeria Roma
92084 Paris La Defense
L69 3SG Liverpool