Mechanical Characterization of Fe-Co-2V (Hiperco): Fatigue/Monotonic Testing Hardness Testing and Fractography

Journal Article · Sat Sep 19 00:00:00 EDT 2020 · Journal of Materials Science Research and Reviews

OSTI ID:1831178

Keller, Elisabeth ^[1]; Khraishi, Tariq ^[2]; Johnson, Kyle ^[3]

---

1. Univ. of New Mexico, Albuquerque, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
2. Univ. of New Mexico, Albuquerque, NM (United States)
3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Fe-Co-2V is a popular metallic alloy used in electromagnetic applications. However, there is a lack of mechanical fatigue characterization of this alloy in the literature. In this work, Fe-Co-2V specimens with rectangular cross-sections were carefully prepared in accordance with standards. They were measured for surface roughness and then subjected to quasi-static monotonic testing, as well as fatigue testing at both 0.5 Hz and 1 Hz frequencies. Both Rockwell hardness and Vickers micro- hardness testing were performed. Additionally, scanning electron microscopy imaging of the fractured surfaces was done. The quasi-static testing revealed a flat yield region characteristic of Laders bands. Here, the fatigue results did not show significant differences or sensitivity to change in frequency, although the fatigue life was higher on average for the 0.5 Hz. However, the fatigue results differed from published work at 0.33 Hz. The fractography revealed purely brittle fracture, with clear chevron marks and fracture initiation always starting at the surface. Lastly, it was identified that the C, D, and F Rockwell hardness scales were appropriate for testing this material and that the grain size necessitated the use of the upper end of indentation force for Vickers micro-hardness testing.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0003525
• OSTI ID: 1831178
• Report Number(s): SAND-2020-11157J; 691468
• Journal Information: Journal of Materials Science Research and Reviews, Journal Name: Journal of Materials Science Research and Reviews Journal Issue: 1 Vol. 6; ISSN 9999-0033
• Publisher: JMSRR
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
fatigue
Hiperco
Laders bands
quasi-static
Rockwell
surface roughness
Vickers