Process and device for hardening a rail

Details Process and device for hardening a rail Process and device for hardening a rail

C - Chemistry, Metallurgy

21

D

C21D 9/04 (2006.01) B21B 45/02 (2006.01) C21D 9/06 (2006.01) C21D 1/02 (2006.01)

Patent

CA 2349321

Process and device for hardening a rail. The process for hardening a rail or part thereof by transforming it from an austenitic structure into a different microstructure that is stable at room temperature comprises aligning, horizontally positioning, and fixing in axial alignment to secure against bending, the rail in its austenitic state; and while keeping the rail fixed in axial alignment and secured against bending, force- cooling the rail or part thereof to allow the austenitic structure to be transformed into said different microstructure. The device for hardening a rail or part thereof by force- cooling comprises a support for supporting the rail; a cooling device for force-cooling the rail or part thereof; and at least two fixing devices for axially aligning and securing the rail against bending during the force-cooling.

Processus et dispositif de trempe de rails. Le processus de trempe d'un rail ou d'une de ses parties en transformant une structure austénitique en une microstructure différente qui est stable à température ambiante consiste à aligner, positionner horizontalement et fixer en alignement axial le rail dans son état austénitique pour le protéger contre tout pliage; et tout en gardant le rail fixé en alignement axial et protégé contre tout pliage, refroidir par air forcé le rail ou une de ses parties pour permettre de transformer la structure austénitique en ladite microstructure différente. Le dispositif de trempe d'un rail ou d'une de ses parties par air forcé comprend un support pour appuyer le rail; un dispositif de refroidissement pour refroidir par air forcé le rail ou une de ses parties; et au moins deux dispositifs de fixation pour aligner axialement et protéger le rail contre tout pliage pendant le refroidissement par air forcé.

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