Abstract
Due to the rapid melting and solidification mechanisms involved in selective laser melting (SLM), CoCrMo alloys fabricated by SLM differ from the cast form of the same alloy. In this study, the relationship between process parameters and the morphology and macromechanical properties of cobalt-chromium alloy micro-melting pools is discussed. By measuring the width and depth of the molten pool, a theoretical model of the molten pool is established, and the relationship between the laser power, the scanning speed, the scanning line spacing, and the morphology of the molten pool is determined. At the same time, this study discusses the relationship between laser energy and molding rate. Based on the above research, the optimal process for the laser melting of cobalt-chromium alloy in the selected area is obtained. These results will contribute to the development of biomedical CoCr alloys manufactured by SLM.
Highlights
Over the years, cobalt-chromium-molybdenum (CoCrMo) has demonstrated a remarkable level of versatility and durability as an orthopedic implant material
In order to study the influence of laser power on the geometry of the molten pool, fiveaCoCr alloy samples were prepared on selective laser melting (SLM) equipment, maintaining a scanning mm/s, scan
In order to study the influence of laser power on the geometry of thespeed moltenofpool, five CoCr alloy samples were prepared on equipment, maintaining a scanning speed of mm/s, a scan line alloy spacing of
Summary
Cobalt-chromium-molybdenum (CoCrMo) has demonstrated a remarkable level of versatility and durability as an orthopedic implant material. These alloys are widely used in biomedical applications as they are the hardest known biocompatible alloys, and possess good tensile and fatigue properties. They were initially applied to dental implant materials, and are commonly used in artificial hip joints and knee joints due to their excellent corrosion resistance [1,2,3] and wear resistance [4,5]. Lee studied the fracture behavior of CoCrMo alloys during tensile deformation, observing that cracks were formed at the triple junction which propagated along the annealing twin boundaries and the interface between the γ-FCC phase and the ε-HCP martensite phases [9]
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