Bond Strength of Multicomponent White Cast Iron Coatings Applied by HVOF Thermal Spray Process

Abstract

Multicomponent white cast iron is a new alloy that belongs to system Fe-C-Cr-W-Mo-V, and because of its excellent wear resistance it is used in the manufacture of hot rolling mills rolls. To date, this alloy has been processed by casting, powder metallurgy, and spray forming. The high-velocity oxyfuel process is now also considered for the manufacture of components with this alloy. The effects of substrate, preheating temperature, and coating thickness on bond strength of coatings have been determined. Substrates of AISI 1020 steel and of cast iron with preheating of 150°C and at room temperature were used to apply coatings with 200 and 400 lm nominal thickness. The bond strength of coatings was measured with the pull-off test method and the failure mode by scanning electron microscopic analysis. Coatings with thickness of 200 lm and applied on substrates of AISI 1020 steel with preheating presented bond strength of 87 ± 4 MPa.

Thermal Sprayed Coatings Used Against Corrosion and Corrosive Wear

“…The surface coating is properly textured to provide the required characteristics or profile on the strip surface. Multi-component white cast iron is a new alloy that belongs to system Fe-C-Cr-WMo-V; it seems promising for rolls when deposited by HVOF spraying Maranho et al (2009).…”

Three-body-type Abrasive Wear Behavior of Multi-alloyed White Cast Iron with Different Carbon Contents Used for Hot Work Rolls

“…Research on solidification sequence 2,4) and heat treatment behavior of multi-alloyed white cast irons with the basic alloy composition has already been reported. [6][7][8][9][10] Though there have been some studies on the abrasive wear resistance of multi-alloyed white cast iron, [11][12][13][14][15][16][17] there has been little systematic research on abrasive wear resistance related to alloying element and heat treatment conditions. 11,15) In previous work, 7) the effect of C content on heat treatment behavior of multi-alloyed white cast iron was clarified.…”