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Partially degradable friction-welded pure iron-stainless steel 316L bone pin

Nasution, A. K. and Murni, N. S. and Sing, N. B. and Idris, M. H. and Hermawan, H. (2015) Partially degradable friction-welded pure iron-stainless steel 316L bone pin. Journal of Biomedical Materials Research Part B-Applied Biomaterials, 103 (1). pp. 31-38. ISSN 1552-4973

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Official URL: http://dx.doi.org/10.1002/jbm.b.33174

Abstract

This article describes the development of a partially degradable metal bone pin, proposed to minimize the occurrence of bone refracture by avoiding the creation of holes in the bone after pin removal procedure. The pin was made by friction welding and composed of two parts: the degradable part that remains in the bone and the nondegradable part that will be removed as usual. Rods of stainless steel 316L (nondegradable) and pure iron (degradable) were friction welded at the optimum parameters: forging pressure 533.2 kPa, friction time525 s, burn-off length515 mm, and heat input54.58 J/s. The optimum tensile strength and elongation was registered at 666 MPa and 13%, respectively. A spiral defect formation was identified as the cause for the ductile fracture of the weld joint. A 40-μm wide intermetallic zone was identified along the fusion line having a distinct composition of Cr, Ni, and Mo. The corrosion rate of the pin gradually decreased from the undeformed zone of pure iron to the undeformed zone of stainless steel 316L. All metallurgical zones of the pin showed no toxic effect toward normal human osteoblast cells, confirming the ppb level of released Cr and Ni detected in the cell media were tolerable.

Item Type:Article
Uncontrolled Keywords:biodegradable metal, bone pin, cytotoxicity
Subjects:Q Science > Q Science (General)
Divisions:Biosciences and Medical Engineering
ID Code:58758
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 04:07
Last Modified:10 Nov 2021 06:16

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