Influence of electron beam deflection techniques used during the cladding process on the wear and corrosion behaviour of cobalt‐based protective coatings on austenitic stainless steel

Abstract

The present work aims to improve the wear resistance of the austenitic stainless steel X6CrNiMoTi17-12-2. In view of the potential use of this alloy, however, corrosion resistance should be maintained where possible. An electron beam surface treatment (cladding) was performed, and the cobalt-based alloy Stellite ® 12 was used as the wear-resistant material. The presented results show the effects of several electron beam oscillation figures during the cladding process with regard to layer bonding, microstructure formation and hardness. The surface hardness achieved was 576 � 18 HV 0.3, almost three times higher than that of the base material (203 � 3 HV 0.3). The scratch energy density -which represents the resistance to abrasive wear -could be increased by a factor of 1.5. Under abrasiveadhesive stress loading conditions, the determined wear volume decreased by a factor of almost 5. Based on the corrosion investigations carried out, it was possible to prove that in comparison to the base material, the tendency towards pitting corrosion could be almost completely suppressed. Keywords: Electron beam / cladding / cobalt-based alloy / austenitic steel / wear Das Ziel der vorliegenden Arbeit ist die Verbesserung des Verschleißwiderstandes des korrosionsbeständigen austenitischen Stahls X6CrNiMoTi17-12-2. Unter Berücksichtigung des Einsatzgebietes dieses Werkstoffes soll die Korrosionsbeständigkeit dabei weitestgehend erhalten bleiben. Hierfür wurde eine Elektronenstrahloberflächenbehandlung (Auftragschweißen), durchgeführt, bei dem die Kobalt-Basislegierung Stellite ® 12 in Form eines verschleißbeständigen Fülldrahts Verwendung fand. Die vorgestellten Ergebnisse zeigen die Auswirkung unterschiedlicher Oszillationsfiguren des Elektronenstrahls, welche während des Auftragsprozesses verwendet wurden, auf die Anbindung der Auftragsschicht, das sich einstellende Gefüge sowie die Härte. Die maximal erreichte Oberflächenhärte betrug mit 576 � 18 HV 0,3 nahezu das Dreifache der Substrathärte (203 � 3 HV

Evidence of Tribological Adaptation Controlled by Tribosynthesis of FeWO4 on an WC-Reinforced Electron Beam M2 Steel Coating Rubbed against a HSS Disk in a Range of Sliding Speeds

“…The use of tungsten carbide for depositing hard coatings in combination with metallic powder mixtures can be performed using such methods as electron beam cladding [24][25][26][27][28], laser cladding [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46], plasma cladding [47,48], and hybrid cladding [49][50][51]. The latter is a combination of the above-mentioned methods.…”