Novel multi-metal stainless steel (316L)/high-modulus steel (Fe-TiB2) composite with enhanced specific modulus and strength using high-pressure torsion

• Published in: Materials letters Vol. 303; p. 130510
• Main Authors: Xiong, Renlong, Kwon, Hyeonseok, Karthik, G.M., Gu, Gang Hee, Asghari-Rad, Peyman, Son, Sujung, Kim, Eun Seong, Kim, Hyoung Seop
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.11.2021; Elsevier BV
• Subjects: High-modulus steels; High-pressure torsion; Iron; Materials science; Metallurgy; Multi-metal composite; Powder metallurgy; Stainless steel; Stainless steels; Titanium diboride; Multi-metal composite; High-modulus steels; Powder metallurgy; High-pressure torsion
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.130510

•Novel multi-metal 316L/Fe-TiB2 composite was fabricated by high-pressure torsion.•This composite possessed high specific modulus, yield strength and ductility.•Heterogeneous ultra-fine microstructures formed with sound bonded interface. A novel multi-metal composite with 316L stainless steel matrix and Fe-TiB2 high-modulus steel reinforcement was successfully fabricated using high-pressure torsion (HPT). After post-HPT annealing at 800 °C for 60 min, the composite demonstrated a superior combination of high specific modulus (~25.5 GPa·cm3·g−1), high yield strength (881 MPa), and good ductility (31%). The improved properties can be ascribed to the high relative density, sound metallurgical bonded 316L/Fe-TiB2 interface, ultra-fine grains and heterogeneous microstructures.