Next Article in Journal
Experimental Data Assessment and Fatigue Design Recommendation for Stainless-Steel Welded Joints
Previous Article in Journal
Re-Melting Nb–Si-Based Ultrahigh-Temperature Alloys in Ceramic Mold Shells
Article Menu

Export Article

Open AccessArticle

Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet

1
Center for Advanced Solidification Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2
Baosteel Central Research Institute, Shanghai 201900, China
3
Department of Chemistry and Physics, Fayetteville State University, Fayetteville, NC 28301, USA
4
National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
*
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 722; https://doi.org/10.3390/met9070722
Received: 2 June 2019 / Revised: 21 June 2019 / Accepted: 24 June 2019 / Published: 26 June 2019
  |  
PDF [5292 KB, uploaded 26 June 2019]
  |  

Abstract

Most structural components undertake cyclic loads in engineering and failures always cause catastrophic economic losses and casualties. In the present work, the phase evolution of Al-Si coating of high-strength boron steel during hot stamping was investigated. Two types of 1500 MPa grade boron steel sheets, one with Al-Si coating and the other without, were studied to reveal the effect on the high-cycle fatigue behavior. The as-received continuously hot-dip Al-Si coating was composed of α(Al), eutectic Al-Si and τ5. After hot stamping at 1193 K, three phases formed in this coating: β2, Fe(Al,Si)2 and α(Fe). The experimental results showed that the endurance limit of the coated steel sheet was 370 MPa under 107 fully reversed tension-compression loading cycles as opposed to 305 MPa in the uncoated sheet. Both the coated and the uncoated specimens showed surface-induced transgranular fatigue fractures. In the uncoated sheet, the fatigue cracks were generated from the decarburization surface, but the Al-Si coating effectively prevented the occurrence of near-surface decarburization during high-temperature hot stamping, and the only cracks in the coated steel sheet were initiated at wire-cutting surfaces. View Full-Text
Keywords: boron steel; Al-Si coating; hot stamping; high-cycle fatigue; decarburization boron steel; Al-Si coating; hot stamping; high-cycle fatigue; decarburization
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

Share & Cite This Article

MDPI and ACS Style

Li, Y.; Tan, N.; Xu, Z.; Luo, Z.; Han, K.; Zhai, Q.; Zheng, H. Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet. Metals 2019, 9, 722.

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]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top