Microstructure and Wear Behavior of TIG Surface-Alloyed AISI 4140 Steel

In this study, AISI 4140 steel surfaces were alloyed with preplaced SiC/C powders using a tungsten-inert gas (TIG) heat source. The effects of different production parameters on the microstructure, hardness, and wear resistance of the alloyed surfaces were investigated. Following the surface alloyin...

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Bibliographic Details
Published in:Tribology transactions 2011-01, Vol.54 (1), p.67-79
Main Authors: ULUTAN, MUSTAFA, YILDIRIM, M. MUSTAFA, BUYTOZ, SONER, ÇELIK, OSMAN N.
Format: Article
Language:English
Subjects:
Alloy powders
Alloy steels
Alloys
Applied sciences
Chromium molybdenum steels
Crystal structure
Exact sciences and technology
Friction, wear, lubrication
Graphite
Hardness
Hardness testing
High strength steels
Machine components
Mechanical engineering. Machine design
Microhardness
Microstructure
Silicon carbide
Structural steels
Surface Alloying
TIG Method
Wear
Wear resistance
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Summary:In this study, AISI 4140 steel surfaces were alloyed with preplaced SiC/C powders using a tungsten-inert gas (TIG) heat source. The effects of different production parameters on the microstructure, hardness, and wear resistance of the alloyed surfaces were investigated. Following the surface alloying, conventional characterization techniques such as optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were used to study the microstructure of the alloyed surfaces. Hardness measurements were performed across the alloyed zones, and wear properties of the alloyed surfaces were evaluated using a block-on-disc wear test method. The collected data suggest that alloyed zones solidify into different microstructures depending on the production parameters. The alloyed surfaces exhibited an increase in hardness and wear resistance; this was attributed to the presence of harder phases and graphite. Lamellar or layered crystal structures of graphite have good lubricity and decrease coefficient of friction. Hardness values of the alloyed surfaces varied between 670 and 1165 HV. The minimum mass loss was observed in the sample that was alloyed with a 0.0581 cm/s process speed, 0.5/0.2 g/s powder feed rate, and a 29.1 kJ/cm heat input. The exhibited mass loss ratio was attributed to M 3 C, M 7 C 3 , and FeSiC carbides in the microstructure. The results conclude that TIG can be used effectively for surface alloying with SiC/C powders to improve the wear resistance of the AISI 4140 steel surface.
ISSN:1040-2004
1547-397X
DOI:10.1080/10402004.2010.519859