ABSTRACT

Direct metal laser sintering (DMLS) of Ti6Al4V is being widely used to manufacture biomedical implants. The rapid solidification process can result in undesired microstructure that imparts poor ductility and end up residual stresses. An optimum heat treatment minimizes distortion and enables a desirable microstructure. In this work, we have examined the efficacy of heat treatment in vacuum and in air, at 800°C and 1100°C. There were minimal differences in the microstructure and mechanical properties when heat treated in air or vacuum, at 800°C. Heat treatment at 1100°C was feasible in vacuum but not in air. Comparisons were made with two-layer thicknesses (30 and 50mm) to enable higher productivity. These results were validated using a cranial implant. Thus, it may be possible to do heat treatment in air at 800°C for DMLS Ti6Al4V thereby enabling manufacturing of implants by DMLS process in a timely and cost-effective manner.

摘要

Ti6Al4V的直接金属激光烧结（DMLS）被广泛用于制造生物医学植入物。快速固化过程可能导致不希望的微观结构，从而导致延展性差并最终产生残余应力。最佳的热处理可最大程度地减少变形并实现所需的微结构。在这项工作中，我们研究了在800°C和1100°C的真空和空气中进行热处理的功效。在空气或真空中于800°C进行热处理时，微观结构和机械性能差异极小。在1100°C的热处理在真空中可行，但在空气中不可行。比较了两层厚度（30和50mm）以提高生产率。使用颅骨植入物验证了这些结果。从而，