Commercially pure titanium (CP-Ti) has seen major applications in biomedical equipment. The use of selective laser melting (SLM) has become more common concerning the fabrication of CP-Ti components with a complicated shape in biomedical implants, where high strength and ductility are required. However, SLM manufactured CP-Ti often exhibits high strength and low ductility, as well as mechanical anisotropy because SLM process typically results in the formation of long columnar grains comprising of fine acicular α′ martensite. Heat treatment must be preceded to transform the acicular α′ to equiaxed α grain. This study demonstrated that annealing at 650 °C of SLM CP-Ti can create an equiaxed structure, resulting in a weakened texture. The formation of equiaxed grains occurred at two types of microstructural features, acicular α′ and irregular massive (α′_m) martensite, which exhibited different sizes, morphologies, and contained different types of substructures under SLM as-fabricated condition. The formation mechanism of equiaxed grains in the α′ region is dominated by the coalescence of acicular α′ of the same variant and the dissolution of α′ into the matrix, whereas the formation mechanism in the α′_m region is primarily dominated by the growth of the preexisting subgrains. A small number of equiaxed grains with new orientations were formed in the α′_m region. The majority of equiaxed grains were formed in the acicular α′ region and inherited the grain orientations of the preexisting α′ or matrix. Therefore, a similar but weakened texture was inherited from the microstructure of the SLM CP-Ti after annealing.

商业纯钛（CP-Ti）已在生物医学设备中得到了主要应用。关于在要求高强度和延展性的生物医学植入物中制造具有复杂形状的CP-Ti组件，使用选择性激光熔化（SLM）变得更加普遍。但是，SLM制造的CP-Ti通常表现出高强度和低延展性以及机械各向异性，因为SLM工艺通常会导致形成由细针状α'马氏体组成的长柱状晶粒。必须先进行热处理才能将针状α'转变为等轴α晶粒。这项研究表明，在SLM CP-Ti的650°C下退火会产生等轴结构，从而导致织构变弱。等轴晶的形成发生在两种类型的微观结构特征上，_m）马氏体，在SLM加工条件下表现出不同的尺寸，形态，并包含不同类型的亚结构。在α等轴晶粒的形成机理相同的变体和α的溶解的“区域由针状α的聚结支配''到基质，而在α的形成机理”_米区域主要是由生长为主先前存在的子晶粒。分别形成在所述α'与新方向等轴晶粒的少数_米区域。等轴晶粒的大部分形成在针状α'区域，并继承了先前存在的α'或基体的晶粒取向。因此，退火后，SLM CP-Ti的微观结构继承了相似但减弱的质构。