Next Article in Journal
Nucleation/Growth Mechanisms and Morphological Evolution of Porous MnO2 Coating Deposited on Graphite for Supercapacitor
Next Article in Special Issue
Tribochemical Characterization and Tribocorrosive Behavior of CoCrMo Alloys: A Review
Previous Article in Journal
Three-Dimensional (3D) Printing of Polymer-Metal Hybrid Materials by Fused Deposition Modeling
Previous Article in Special Issue
Scaling Effects on Materials Tribology: From Macro to Micro Scale
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessFeature PaperArticle
Materials 2017, 10(10), 1204; doi:10.3390/ma10101204

Graded Microstructure and Mechanical Performance of Ti/N-Implanted M50 Steel with Polyenergy

State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Received: 27 August 2017 / Revised: 11 October 2017 / Accepted: 12 October 2017 / Published: 19 October 2017
View Full-Text   |   Download PDF [3341 KB, uploaded 20 October 2017]   |  

Abstract

M50 bearing steels were alternately implanted with Ti+ and N+ ions using solid and gas ion sources of implantation system, respectively. N-implantation was carried out at an energy of about 80 keV and a fluence of 2 × 1017 ions/cm2, and Ti-implantation at an energy of about 40–90 keV and a fluence of 2 × 1017 ions/cm2. The microstructures of modification layers were analyzed by grazing-incidence X-ray diffraction, auger electron spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. The results showed that the gradient structure was formed under the M50 bearing steel subsurface, along the ion implantation influence zone composed of amorphous, nanocrystalline, and gradient-refinement phases. A layer of precipitation compounds like TiN is formed. In addition, nano-indentation hardness and tribological properties of the gradient structure subsurface were examined using a nano-indenter and a friction and wear tester. The nano-indentation hardness of N + Ti-co-implanted sample is above 12 GPa, ~1.3 times than that of pristine samples. The friction coefficient is smaller than 0.2, which is 22.2% of that of pristine samples. The synergism between precipitation-phase strengthening and gradient microstructure is the main mechanism for improving the mechanical properties of M50 materials. View Full-Text
Keywords: ion implantation; M50 bearing steel; friction and wear; gradient structure materials; nano-hardness ion implantation; M50 bearing steel; friction and wear; gradient structure materials; nano-hardness
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Jie, J.; Shao, T. Graded Microstructure and Mechanical Performance of Ti/N-Implanted M50 Steel with Polyenergy. Materials 2017, 10, 1204.

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.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top