Next Article in Journal
Direct Femtosecond Laser Fabrication of Superhydrophobic Aluminum Alloy Surfaces with Anti-icing Properties
Next Article in Special Issue
Improving Tribological Properties of Stainless Steel Surfaces by Femtosecond Laser Irradiation
Previous Article in Journal
Heat Transfer Enhancement by Shot Peening of Stainless Steel
Previous Article in Special Issue
Microstructure and Properties of Cr-Fe2B Composite Coatings Prepared by Pack-Preboronizing Combined with Electro Brush-Plating
Open AccessArticle

Effect of Nb Content on the Microstructure and Wear Resistance of Fe-12Cr-xNb-4C Coatings Prepared by Plasma-Transferred Arc Welding

1
School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
2
School of Materials and Energy, Southwest University, Chongqing 400715, China
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(6), 585; https://doi.org/10.3390/coatings10060585
Received: 10 June 2020 / Revised: 22 June 2020 / Accepted: 22 June 2020 / Published: 23 June 2020
(This article belongs to the Special Issue Surface Engineering for Friction and Wear Reduction)
The Fe-Cr-C coatings with different levels of Nb addition were prepared on carbon steel by a plasma transferred arc (PTA) weld-surfacing process and their microstructure and properties were investigated. As the Nb content increases from 8.96% to 12.55%, the coating gradually changes from a hypereutectic structure (martensite, austenite matrix, primary NbC and eutectic γ+M7C3) to a near eutectic structure (γ+M7C3 and NbC) and finally a hypoeutectic structure (primary γ, γ+M7C3 and NbC). As the Nb content increases, the hardness and wear resistance of the coating first increase and then decrease, which is closely related to the NbC volume fraction first increasing and then the NbC size coarsening. The Fe-Cr-C coating with 11.65% Nb balances the NbC content and size, and has the highest hardness and best wear resistance. As the Nb content increases further, the formation and aggregation of coarse NbC carbides in the coating results in high brittleness of the coating, which may cause the carbide particles to peel off the coating during the wear process, thereby reducing wear resistance. View Full-Text
Keywords: NbC; plasma-transferred arc welding; eutectic; wear resistance NbC; plasma-transferred arc welding; eutectic; wear resistance
Show Figures

Figure 1

MDPI and ACS Style

Zong, L.; Zhao, Y.; Long, S.; Guo, N. Effect of Nb Content on the Microstructure and Wear Resistance of Fe-12Cr-xNb-4C Coatings Prepared by Plasma-Transferred Arc Welding. Coatings 2020, 10, 585.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop