Abstract
Additive manufacturing is a rapidly developing manufacturing technology of great potential for applications. One of the merits of AM is that the microstructure of manufactured materials can be actively controlled to meet engineering requirements. In this work, three types of Ti-6Al-4V (TC4) materials with different porosities are manufactured using selective laser melting using different printing parameters. Their dynamic behaviors are then studied by planar impact experiments based on the free-surface velocity measurements and shock-recovery characterizations. Experimental results indicate that the porosity significantly affects their dynamic response, including not only the yield, but also spall behaviors. With the increasing porosity, the Hugoniot elastic limit and spall strength decrease monotonically. In the case of TC4 of a large porosity, it behaves similar to energy-absorbing materials, in which the voids collapse under shock compression and then the spallation takes place.
Highlights
Additive manufacturing (AM) technology has a series of technical advantages such as rapid prototyping, free manufacturing, and high material utilization, showing great development potentials and broad application prospects in automation industry [1,2], aerospace [3,4], shipbuilding, biotechnology [5], automobile [6], parts processing [7], and other fields [8,9]
AM technology has shown one advantage which is even more attractive—that is, it can actively manipulate the microstructure of materials by adjusting printing parameters and strategies, such that some unique and excellent mechanical properties could be designed for specific applications
SLM TC4 samples were wire-cut to 1.8 mm in free‐surface particle velocity history
Summary
Additive manufacturing (AM) technology has a series of technical advantages such as rapid prototyping, free manufacturing, and high material utilization, showing great development potentials and broad application prospects in automation industry [1,2], aerospace [3,4], shipbuilding, biotechnology [5], automobile [6], parts processing [7], and other fields [8,9]. AM technology has shown one advantage which is even more attractive—that is, it can actively manipulate the microstructure of materials by adjusting printing parameters and strategies, such that some unique and excellent mechanical properties could be designed for specific applications. The mechanical properties of materials under dynamic loading are of importance and have been approved to be sensitive to the internal microstructure [15–17]. There is an urgent demand to employ AM technology to control the microstructures, and to manipulate the macroscopic dynamic properties of materials
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