The Ti-6Al-4V samples have been fabricated by the laser powder bed fusion (LPBF) process, in which the special emphasis is given on the optimization of laser power and scan speed to attain better mechanical strength and corrosion resistance. In the present study, the percentage elongation was recorded using extensometer and the sample recorded with higher elongation and tensile strength are subjected to corrosion resistance studies and the results are correlated with the microstructural features. The grain refinement occurs during the heat treatment process, the fine grain distribution less than 10 µm results in improved tensile strength and reasonable value of percentage elongation as per the Hall – Petch effect. The finer grain has resulted in improved corrosion resistance and tensile strength which is scarcely reported. The results reveal that as printed Ti-6Al-4V samples contain both the α and β phases in more or less equal percentages. The grain sizes of both α and β phases appear larger in as printed samples, whereas ultra-fine for heat-treated Ti-6Al-4V samples. The formation of ultra-fine grains is due to the dissolution and recrystallization of α and β phases. The corrosion studies in both NaCl and phosphate buffer electrolytes reveal that non-heat treated Ti-6Al-4V samples undergo high corrosion rates, while the heat-treated Ti-6Al-4V samples demonstrate lower corrosion rates. The electrochemical impedance results also reflect a similar trend, where the low corrosion rates were attained due to the formation and buffer layer effect induced by ultra-fine grain structures of β colonies. To highlight, this work paves a new pathway for producing the Ti-6Al-4V alloy samples with high ductility and corrosion resistance through the variations in process parameters and heat treatment conditions.

Ti-6Al-4V样品是通过激光粉末床熔合（LPBF）工艺制造的，其中特别强调优化激光功率和扫描速度以获得更好的机械强度和耐蚀性。在本研究中，使用引伸计记录伸长率，并对记录的具有较高伸长率和拉伸强度的样品进行耐蚀性研究，其结果与微观结构特征相关。晶粒细化发生在热处理过程中，小于10 µm的细晶粒分布可根据Hall – Petch效应提高抗拉强度，并具有合理的百分伸长率值。较细的晶粒导致改善的耐腐蚀性和拉伸强度，这鲜有报道。结果表明，印刷的Ti-6Al-4V样品或多或少相等地包含α和β相。在印刷样​​品中，α相和β相的晶粒尺寸均较大，而经热处理的Ti-6Al-4V样品则为超细晶粒。超细晶粒的形成是由于α和β相的溶解和重结晶。在NaCl和磷酸盐缓冲电解液中的腐蚀研究表明，未经热处理的Ti-6Al-4V样品的腐蚀速率较高，而经过热处理的Ti-6Al-4V样品的腐蚀速率较低。电化学阻抗结果也反映了类似的趋势，其中低腐蚀速率归因于β菌落的超细晶粒结构诱导的形成和缓冲层效应。为了突出，