Purpose of the development: Obtaining high-quality cast iron and achieve maximum durability and minimum wear of cylinder liners and piston rings of diesel engines and internal combustion engines.

Recommended application field: Foundry parts of internal combustion engines in the engineering and shipbuilding industries.

The development stage readiness: tested in laboratory condition

Description of the development:
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To obtain high-quality iron castings need to manage physical and mechanical properties of the material in all phases of the workpiece. Given structure, the hardness and wear resistance at each point in the working surface of the cylindrical sleeve can be ensured by a certain crystallization rate and cooling the metal at this point. To maximize durability and minimize wear of cylinder liners and piston rings of diesel engines structure should have iron cores, platelet-shaped graphite, straight or zavihorenny, a metal matrix sorbitoobraznogo perlite structurally complete absence of free ferrite and cementite inclusions in an amount of not more than 5% of microsection . Education of a particular structure (ferrite, pearlite, cementite, graphite) depends on the rate of solidification and cooling of the casting. The cooling rate depends on the properties of the mold used for casting and the wall thickness of the casting. To obtain a gray iron having a low content of free cementite structurally necessary slow rate of crystallization of the casting, i.e. mold with minimum thermal conductivity. Crystallization of the workpiece should be performed with the lowest possible speed for cooling graphite separating the desired shape and size, in the desired amount, with an optimal distribution pattern and the suppression of carbide-forming processes. For this form to be produced with a minimum thermal conductivity and heat capacity. The temperature of pig iron greatly affects the grain size and the amount of graphite inclusions to the reduction of nucleation due to their dissolution at the smelting temperature increases. Harmful effects on the wear resistance of cast high overheating of the metal for the desired alloying elements can be avoided through the use of low-melting alloys. Using additional ligatures refines metal and improves its quality in comparison with the individual administration of alloying elements. The cooling rate should provide intermediate decomposition of austenite and the formation of particulate and solid conversion as sorbitoobraznogo perlite with a hardness of 250 ... 280 HB. In addition, slow cooling from the casting 400 ... 500 ° C and ensure its removal autotempering stresses during molding.

corresponds technical description
Guarantees stable results getting

Possibility of transfer abroad:
Technological document's sale
Combinated reduction to industrial level

Photo

Country Ukraine

For additional information turn to:
E-mail: gal@uintei.kiev.ua