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

摘要: This article describes the development of a partially degradable metal bone pin, proposed to minimize occurrence refracture by avoiding creation holes in after pin removal procedure. The was made friction welding and composed two parts: part that remains nondegradable will be removed as usual. Rods stainless steel 316L (nondegradable) pure iron (degradable) were welded at optimum parameters: forging pressure =33.2 kPa, time = 25 s, burn-off length = 15 mm, heat input = 4.58 J/s. tensile strength elongation registered 666 MPa 13%, respectively. A spiral defect formation identified cause for ductile fracture weld joint. 40-µm wide intermetallic zone along fusion line having distinct composition Cr, Ni, Mo. corrosion rate gradually decreased from undeformed 316L. All metallurgical zones showed no toxic effect toward normal human osteoblast cells, confirming ppb level released Cr Ni detected cell media tolerable. © 2014 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 103B: 31–38, 2015.