Effect of WC-Co cermet positioning and Ni-Cr interlayer on the microstructure and mechanical response of the dissimilar WC-Co / AISI 304 L rotary friction joint

Type : Publication
Auteur(s) :  Billel CHENITI, Brahim BELKESSA, Bouzid MAAMACHE, Naima Ouali, Richard Sedlák, Pavol Hvizdoš, Zoheir BOUTAGHOU
Année :  2021
Domaine : Sciences et génie des matériaux
Revue : International Journal of Refractory Metals and Hard Materials
Résumé en PDF :  (résumé en pdf)
Fulltext en PDF :  (.pdf)
Mots clés :  Rotary friction welding WC-Co cermet NiCr interlayer Interface Microstructure Mechanical properties

Résumé : 

In this work, incompatible properties of WC-Co cermet and AISI 304 steel were combined in the same component using rotary friction welding (RFW) process. The dissimilar joints were performed using a ductile NiCr interlayer with the change in the WC-Co cermet positioning i.e., fixed rotary side and feeding side. Similar microstructure across the weld joints was obtained of the different welding configurations that produced similar behavior in hardness and elastic modulus. A diffusion zone was formed at the weld interface as a result of the mutual inter-diffusion of both cermet (W and Co) and steel elements (Fe, Cr and Ni) that enhanced with the insertion of the interlayer when the cermet was fixed in rotary side. The introduction of the NiCr interlayer was beneficial to relax the residual stresses and improving the shear strength of the WC-Co cermet/AISI 304 L steel joints, which is promising technology for drilling tools industries.