Influence of Wear Performance of PTA Processed High Speed Steel Hardfacing by Solidification Kinetics

Abstract:

Fe-based hardfacings with high vanadium content become more important for industrial applications because of low production and material costs, combined with high abrasion resistance. The aim of this work is to gain a deeper fundamental understanding of heat management impact of a Fe-based hardfacing alloy on resulting wear properties related to real field conditions. In this work a FeVCrC alloy was deposited by plasma transferred arc welding technology varying solidification kinetics due to active heat management. In-situ thermal couple measurements during processing were performed to determine t_8/5 cooling-off time relevant for precipitation formation. Microstructural investigation was done by microscopy (e.g. OM, SEM), X-ray diffraction as well as macroscopic hardness, respectively. Wear performance was characterized by using the ASTM G65 dry-sand rubber-wheel procedure A for 3-body abrasion under low-stress. In addition 2-body impact/abrasion behavior was evaluated utilizing continuous impact abrasion test (CIAT). For quantitative wear description 3D microscopy and mass loss determination were done after the test. Additional SEM investigations on the worn surface and on the tribologically stressed near-surface region were applied to deepen the fundamental wear understanding.Results showed that the t_8/5 cooling-off time is strongly influenced by solidification conditions due to thermal substrate properties. Nevertheless t_8/5 cooling-off time is not necessarily correlated to wear behavior. Significant variations of micro-and macro structural parameters were obtained for dilution with substrate, precipitation content and distribution, whereas macro hardness was obtained on a relatively constant level. Two-body impact/abrasion wear behavior showed plastically deformed zones where the fine precipitations act in a ductile way. Under 3-body abrasion conditions precipitations of hard phases play a dominant role for providing high wear resistance related to microstructural features like amount, distribution and size of precipitations. It can be claimed that no direct correlation of 2-body and 3-body wear rates with deposition hardness of hardfacing has been observed.

• Periodical: Key Engineering Materials (Volume 674)
• Pages: 225-232
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.674.225
• Online since: January 2016
• Authors: Christian Katsich*, Martin Kirchgassner, Ewald Badisch
• Keywords: Cooling-Off Time, Hardfacing, Plasma Transferred Arc, Tribology, Wear

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