Laser direct casting of high nickel alloy parts

sintered densities. Variations in powder temperature were shown to lead to part-to-part variations. The need for robustness to resist effects of powder temperature variations was emphasized. Effects of process parameters were investigated and discussed. BEHAVIOUR OF POWDER MIX CONSTITUENTS DURING COLD AND WARM COMPACTION M.L.Gagne. (RTZ Iron and Titanium Technology, Canada. 1 Phenomena occurring during compaction were reviewed and their effects were discussed with regard to comparison between cold and warm compaction. An investigation of compaction of Fe powder with and without lubricant, at 415 or 690 MPa, 23 or 15O”C, was described. The green compacts were subjected to detailed characterization. Polished and fractured surfaces were examined. The role of lubricants, compaction pressure and temperature, in particular rearrangement during densification, were identified. The interpartiwhich determined green cle bond, strength, was investigated.

WARM COMPACTION OF A MULTILEVEL PART IN IRONCOPPER-NICKEL-CARBON

ANALYSIS OF POWDER FEEDING SYSTEMS ON QUALITY OF LASER CLADDING

W.Trapp et al. (Dorst Machinen und Anlagen Bau, Germany.) The advantages of using warm compaction to obtain increased part density were discussed. A multilevel part, with a final density of 7.2 g.cmm3,in a Fe-CuNi-C alloy was considered. The part had previously been made by a double-pressdouble-sinter route, and the structure and properties of the original part and warm compacted parts were compared.

C.W.Chen et al. (Michigan State University, USA.) The quality of laser clad tracks was reviewed and the importance of accuracy in powder feeding was emphasized. An investigation of powder feeding systems was described in detail. Microstructures of material deposited, interface and substrate were studied.

PM

laser manufacturing

LASER DIRECT CASTING OF HIGH NICKEL ALLOY PARTS M.A.McLean et al. (Laser Laboratory, UK., Laser direct casting, in which metal powder is injected into a laser generated melt pool, produces a solidified metal or alloy track. Successive layers can be built up. The method uses a co-axial nozzle which ensures omni-directional deposition.

LASER ENGINEERED NET SHAPING PROCESS -OPTIMIZATION OF SURFACE AND MICROSTRUCTURES J.E.Smugeresky et al. (Sandia National Laboratories. 1 It was reported that laser engineered net shaping had demonstrated the feasibility of using laser powder deposition to fabricate a near net shape using a CAD solid model. Current developments were described. It was shown that powder size and size distribution are critical factors. Infrared imaging was used to measure temperature gradients during processing.

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