首页|Spallation damage mechanisms and microstructural evolution in selective laser melted Ti-6Al-4V under quasi-isentropic loading
Spallation damage mechanisms and microstructural evolution in selective laser melted Ti-6Al-4V under quasi-isentropic loading
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NETL
NSTL
Elsevier
The microstructure of additively manufactured(AM)Ti-6Al-4V significantly differs from that of traditional casting processes, and this microstructural variation directly impacts the material's mechanical properties. To ensure the safety and stability of additively manufactured Ti-6Al-4V in practical applications, this study achieves controlled dynamic loading by optimizing the cross-sectional surface density of the structural gradient flyer(SGFs). It further explores material response characteristics under varying stress and strain rates by adjusting the loading velocity in spallation experiments. The initial microstructure of Ti-6Al-4V produced via selective laser melting (SLM) was investigated and analyzed, and quasi-isentropic loading experiments were conducted on 6 mm thick samples at strain rates ranging from 5.07 × 10~4 s~(-1) to 1.24 × 10~5 s~(-1). The results demonstrate that, in comparison to as-cast alloys, the SLM-processed Ti-6A1-4V alloys exhibit reduced plasticity, primarily attributed to the higher cooling rates of SLM. The alloys predominantly display brittle fracture characteristics, with distinct transgranular fracture patterns. As the loading strain rate increases, the pulse width of the loading waveform progressively narrows, spall strength markedly rises, and cracks continue to propagate and grow. Grain refinement was evident in both the crack extension region and along the edges, accompanied by localized stress concentration, yet no signs of recrystallization were detected. The spall strength of the material exhibited heightened sensitivity to impact stresses relative to plate impact conditions. These findings offer critical theoretical insights into the potential applications of additively manufactured titanium alloys, particularly in aerospace and defense sectors.
State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, China
Hubei Longzhong Laboratory, 441000, Xiangyang, Hubei, China||State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Wuhan, China
NETL
NSTL
Elsevier
