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Geometry of remeltings and efficiency of the surface remelting process applied to cobalt alloy castings

Mróz M., Orłowicz W., Tupaj M.

Archives of Foundry Engineering

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2013

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Vol. 13, iss. 2

95--98

EN

The paper summarises results of measurements of remelting area geometry, thermal efficiency and melting efficiency characterising the surface remelting process applied to castings of MAR-M-509 cobalt alloy. The remelting process was carried out with the use of GTAW (Gas Tungsten Arc Welding) method in protective atmosphere of helium, at the electric current intensity in the range from 100 A to 300 A, and the electric arc scanning velocity vs in the range from 200 mm/min to 800 mm/min. The effect of current intensity and electric arc scanning velocity on geometrical parameters of remeltings, thermal efficiency, and melting efficiency characterising the remelting process has been determined.

2

Własności warstwy wierzchniej stali X40CrMoV5-1 w zależności od warunków przetapiania przy użyciu lasera diodowego dużej mocy

Dobrzański L.A., Bonek M., Klimpel A.

Inżynieria Materiałowa

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2003

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R. XXIV, nr 6

445-448

PL

Badania obejmują próby przetapiania warstwy wierzchniej stali do pracy na gorąco X40CrMoV5-1 z zastosowaniem lasera diodowego dużej mocy (HPDL) w atmosferze gazów ochronnych. Określono wpływ parametrów przetapiania oraz sposobu ochrony gazowej, na strukturę i własności warstwy wierzchniej oraz geometrię i kształt przetopienia. Zbadano wpływ warunków technologicznych przetapiania oraz zmiany grubości poszczególnych stref w warstwie wierzchniej. Przedstawiono zależność zmiany mikrotwardości w zależności od stopnia wpływu wiązki laserowej na obrabianą powierzchnię, a w szczególności wzrostu twardości w przetopionej warstwie. Rezultatem wykonywanych badań jest opracowanie wytycznych przetapiania powierzchni stali X40CrMoV5-1 przy użyciu lasera diodowego dużej mocy w celu otrzymania optymalnych własności wytrzymałościowych i użytkowych.

EN

Investigations included remelting experiments on the X40CrMoV5-1 hot-work steel with the high power diode laser. Tests have been made using the high power diode laser (HPDL) in the technological process of remelting. The effect of remelting parameters on structure and properties of its surface layer, as well as on remelting geometry and shape. The influence of the technological conditions and their effect on the mechanical properties of the surface layer, and especially its hardness has been tested. Dependence of the microhardness changes, on the degree of the laser beam influence on the treated surface, and mostly on the hardness increase in the remelted layer is presented. The influence of remelting process parameters on the structure of substrate material is presented. Guidelines for remelting of the X40CrMoV5-1 steel surface using the high power diode laser feature the outcome of the investigation aimed at obtaining its optimum mechanical and working properties.

3

Geometria przetopień powierzchni odlewów żeliwnych uzyskanych metodą GTAW

Orłowicz W., Trytek A.

Problemy Eksploatacji

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2000

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nr 2

263-275

PL

W pracy przedstawiono wyniki badań wpływu prędkości przemieszczania elektrycznego oraz zmian natężenia prądu spawania na ilość ciepła pochłoniętego przez odlew płytki z niestopowego żeliwa sferoidalnego. Pomiary wykonano na stanowisku kalorymetrycznym. Określono sprawność cieplną procesu oraz geometrię przetopień. Wyniki przedstawiono wykreślnie.

EN

Tests were performed castings with unalloyed ductile graphite iron obtained in cupola. The castings were made in form of plates with dimensions 300 x 200 x 20 mm. From those castings small plates with dimensions 210 x 50 x 10 mm were cut up. These cast iron plates were fused by GTAW process using currents I = 50÷300 A, on arc motion speed vs = 200÷800 mm/min, and tungsten electrode 2,4 mm dia in helium atmosphere on a stand equipped with calorimeters. The width, depth and length of fusion area were measured on the samples and the surface area of its cross section was calculated. The tests to determined arc heat as well as the calorimetrically measured heat over the surface fused castings were carried uot. This in turn enabled the determination of the thermal efficiency of the process. Also, the relations between arc motion speed and welding current and the depth, width and length pool, cross section area of fusion or volume of melt pool have determined. In the fusion of unalloyed ductile iron the total heat input varied within 5.2 to 281,3 kJ. On the basis of obtained test results, it was found as follows: The highest thermal efficiency of the process, n = 78%, was obtained while using current of I = 300 A and arc motion speed of vs = 200 mm/min, The lowest thermal efficiency of the process, n = 44%, was obtained using current of I = 50 A And arc motion speed of vs = 800 mm/min, Arising the weld current and arc motion speed reduction is accompanied with arising value all evaluated fusion parameter. The obtained results can be explained by the fact that the heat flux flow and convection in molten pool are important from the point of view of pool penetration.