Phase Transformations on Friction Welding of Dissimilar Thermochemically Treated Steels

Ion Mitelea; Corneliu Craciunescu

doi:10.4028/www.scientific.net/SSP.172-174.916

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Phase Transformations on Friction Welding of Dissimilar Thermochemically Treated Steels

Abstract:

The friction welding process provides a continuity of the joined materials at crystalline network level. This continuity is based on diffusion phenomena, on the forces of inter-atomic links as well as on the thermal and mechanical energy inputs. The action of the thermo-deformational field developed during the welding process is associated with solid phase transformations, influenced in terms of nature and intensity by the sensibility to mechanical hardening of the steel components, the critical quenching rate and the re-crystallization temperatures. The composition and microstructural gradients of thermochemically treated steels by carburization and nitriding leads to particularities in the morphology of the transformations induced in the welding plane. The work reports on the transformations observed in the joining plane explored by microstructural, hardness and impact testing.

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Periodical:

Solid State Phenomena (Volumes 172-174)

Pages:

916-921

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.916

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Online since:

June 2011

Authors:

Ion Mitelea, Corneliu Craciunescu

Keywords:

Dissimilar Materials, Friction Welding, Microstructural Transformations, Thermochemical Treatments

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