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Title: Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing

Abstract

Tribological performance of steel materials can be substantially enhanced by various thermal surface hardening processes. For relatively low-carbon steel alloys, case carburization is often used to improve surface performance and durability. If the carbon content of steel is high enough (>0.4%), thermal treatments such as induction, flame, laser, etc. can produce adequate surface hardening without the need for surface compositional change. This paper presents an experimental study of the use of friction stir processing (FSP) as a means to hardened surface layer in AISI 4140 steel. The impacts of this surface hardening process on the friction and wear performance were evaluated under both dry and lubricated contact conditions in reciprocating sliding. FSP produced the same level of hardening and superior tribological performance when compared to conventional thermal treatment, using only 10% of the energy and without the need for quenching treatments. With FSP surface hardness of about 7.8 GPa (62 Rc) was achieved while water quenching conventional heat treatment produced about 7.5 GPa (61 Rc) hardness. Microstructural analysis showed that both FSP and conventional heat treatment produced martensite. Although the friction behavior for FSP treated surfaces and the conventional heat treatment were about the same, the wear in FSP processedmore » surfaces was reduced by almost 2× that of conventional heat treated surfaces. Furthermore, the superior performance is attributed to the observed grain refinement accompanying the FSP treatment in addition to the formation of martensite. As it relates to tribological performance, this study shows FSP to be an effective, highly energy efficient, and environmental friendly (green) alternative to conventional heat treatment for steel.« less

Authors:
 [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1338951
Alternate Identifier(s):
OSTI ID: 1247023
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Wear
Additional Journal Information:
Journal Volume: 332-333; Journal Issue: C; Journal ID: ISSN 0043-1648
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FSP; surface hardening; friction; grain refinement; phase transformation; wear

Citation Formats

Lorenzo-Martin, Cinta, and Ajayi, Oyelayo O. Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing. United States: N. p., 2015. Web. doi:10.1016/j.wear.2015.01.052.
Lorenzo-Martin, Cinta, & Ajayi, Oyelayo O. Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing. United States. https://doi.org/10.1016/j.wear.2015.01.052
Lorenzo-Martin, Cinta, and Ajayi, Oyelayo O. 2015. "Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing". United States. https://doi.org/10.1016/j.wear.2015.01.052. https://www.osti.gov/servlets/purl/1338951.
@article{osti_1338951,
title = {Rapid surface hardening and enhanced tribological performance of 4140 steel by friction stir processing},
author = {Lorenzo-Martin, Cinta and Ajayi, Oyelayo O.},
abstractNote = {Tribological performance of steel materials can be substantially enhanced by various thermal surface hardening processes. For relatively low-carbon steel alloys, case carburization is often used to improve surface performance and durability. If the carbon content of steel is high enough (>0.4%), thermal treatments such as induction, flame, laser, etc. can produce adequate surface hardening without the need for surface compositional change. This paper presents an experimental study of the use of friction stir processing (FSP) as a means to hardened surface layer in AISI 4140 steel. The impacts of this surface hardening process on the friction and wear performance were evaluated under both dry and lubricated contact conditions in reciprocating sliding. FSP produced the same level of hardening and superior tribological performance when compared to conventional thermal treatment, using only 10% of the energy and without the need for quenching treatments. With FSP surface hardness of about 7.8 GPa (62 Rc) was achieved while water quenching conventional heat treatment produced about 7.5 GPa (61 Rc) hardness. Microstructural analysis showed that both FSP and conventional heat treatment produced martensite. Although the friction behavior for FSP treated surfaces and the conventional heat treatment were about the same, the wear in FSP processed surfaces was reduced by almost 2× that of conventional heat treated surfaces. Furthermore, the superior performance is attributed to the observed grain refinement accompanying the FSP treatment in addition to the formation of martensite. As it relates to tribological performance, this study shows FSP to be an effective, highly energy efficient, and environmental friendly (green) alternative to conventional heat treatment for steel.},
doi = {10.1016/j.wear.2015.01.052},
url = {https://www.osti.gov/biblio/1338951}, journal = {Wear},
issn = {0043-1648},
number = C,
volume = 332-333,
place = {United States},
year = {Sat Jun 06 00:00:00 EDT 2015},
month = {Sat Jun 06 00:00:00 EDT 2015}
}

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Cited by: 20 works
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Works referenced in this record:

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Effect of heat treatment on surface hardness and tribological behavior of XC38 steel—approach by the experiments plans
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Recent Development in Friction Stir Processing as a Solid-State Grain Refinement Technique: Microstructural Evolution and Property Enhancement
journal, July 2019


Improvement Effect of Green Lubricants on the Tribological and Mechanical Performance of 4140 Steel
journal, November 2019