Abstract
Heat treatment processing is commonly applied for additively manufactured metal materials, since the as-fabricated material frequently exhibits high internal stress and self-cracking. In this work, a heat treatment route was applied to an additively manufactured Ti-6Al-4V alloy, and its effect on the dynamic compressive behavior was investigated. The experimental results showed that the heat treatment process not only increased the dynamic compressive strength of the material, but also induced a change of the dynamic compressive strength from isotropic to anisotropic. In addition, the strain rate sensitivity of the material was reduced by heat treatment, even though both the as-deposited and heat-treated samples demonstrated positive sensitivity to the loading rate. Microstructural analysis suggested that the grain size and morphology were the same before and after heat treatment, while the internal stress increased due to heat treatment.
Highlights
Three-dimensional printing is a breakthrough technique and is widely used to manufacture complex structures that can hardly be produced with traditional techniques.In comparison with traditional technologies, 3D printing or laser deposition additive manufacturing is characterized by high flexibility and short production cycle and is especially suitable for complex-shaped components
A forged pure Ti-6Al-4V plate with dimensions of 110 × 40 × 6 mm3 was used as a substrate for the Laser Additive manufacturing (LAM) process, which was grounded with the SiC paper and degreased with acetone and ethanolIncrement before use
The needle grains have been widely reported for additively manufactured Ti-6Al-4V alloys as the α’ martensite phase [16]
Summary
Three-dimensional printing is a breakthrough technique and is widely used to manufacture complex structures that can hardly be produced with traditional techniques. In comparison with traditional technologies, 3D printing or laser deposition additive manufacturing is characterized by high flexibility and short production cycle and is especially suitable for complex-shaped components. It has been widely used in many fields including automobile and aerospace industries [1,2,3]. Strain rate sensitivity as regards deformation mechanisms, mechanical properties and failAhmed et al [8] reported that the activation of deformation-induced phase transformation ure twinning modes This issue is veryon important forDeformation structural materials that are intended and is strongly dependent strain rate. Additively manufactured alloys show quite rate different microstructures from those processed by traditional technology [12,13,14,15], implying that AM alloys may have a different strain rate
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