Fundamental Properties of Ti-6Al-4V Alloy Produced by Selective Laser Melting Method

Morita, Tatsuro; Tsuda, Chika; Sakai, Hitoshi; Higuchi, Norio

doi:10.2320/matertrans.m2017103

Cited by 13 publications

(7 citation statements)

References 25 publications

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“…This is due to the martensitic transformation owing to water-quenching. In a previous study, 16) we reported on the possibility that fine ¢ phase exists in the dark area of the phase map. Thus, it is inferred that the ¢ phase was generated in the fine acicular ¡A phase.…”

Section: Resultsmentioning

confidence: 93%

Rapid Oxynitriding of Ti–6Al–4V Alloy by Induction Heating in Air

et al. 2021

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In this study, a rapid oxynitriding technique based on induction-heating was developed for the titanium alloy Ti6Al4V, and its effects on surface characteristics of the alloy were investigated. The surface microstructures of the alloy were characterized by employing a scanning electron microscope, electron back-scatter diffraction, X-ray diffraction and nano-indentation tests. Induction-heating in air for 60 s caused the formation of a hardened layer on the Ti6Al4V alloy surface, which can be attributed to the diffusion of oxygen and nitrogen atoms. When water quenching was performed after heating, transformation to an acicular martensitic ¡A phase occurred, resulting in increased in substrate hardness. However, cracks were initiated at the surface of the oxynitrided alloy. The cracks were eliminated through fine particle bombarding treatment, whereas the hardened layer formed by the oxynitriding treatment remained. The obtained results thus indicate that the oxynitriding technique developed in this study can enhance the wear resistance and tensile strength of the Ti6Al4V alloy within a short period of time.

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Section: Resultsmentioning

confidence: 93%

Rapid Oxynitriding of Ti–6Al–4V Alloy by Induction Heating in Air

et al. 2021

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“…For comparison, we referred to our previous study concerning the XRD profiles, the Vickers hardness, the mechanical properties, the S-N plots and the observation results of the fracture surfaces of the wrought material (hereafter W material) and the UN material. 28) In addition, the W material was annealed at 1023 K for 3.6 ks before the tests. For reference, its chemical compositions are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…3). Based on the previous study, 28) the dark regions in the phase map of the UN material were considered to mainly be composed of the metastable ¢ phase. However, no peaks of the ¢ phase were found in the XRD profile of the UN material (Fig.…”

Section: Microstructuresmentioning

confidence: 99%

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Short-Time Heat Treatment for Ti–6Al–4V Alloy Produced by Selective Laser Melting

et al. 2022

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In this study, we systematically investigated the effects of short-time heat treatment on the mechanical properties and fatigue strength of Ti 6Al4V alloy produced by selective laser melting (hereafter SLM material). The short-time heat treatment was composed of the following two heat treatments: the first treatment was short-time solution treatment (ST treatment) in which the SLM material was heated at 11731298 K for 60 s and water-quenched; the second treatment was short-time aging treatment (AG treatment) in which the ST-treated materials were reheated at 823 K for 40 s and air-cooled. Before the heat treatments, the microstructure of the SLM material was composed of the acicular ¡A martensite phase and the metastable ¢ phase. When the ST treatment was conducted at 1173 K and 1223 K lower than the ¢ transformation temperature of Ti6Al4V alloy (1271 K), the ¡A phase was transformed to the stable ¡ phase during heating and the new fine ¡A phase was generated in the metastable ¢ phase by water quenching. These microstructural changes reduced the static strength but increased the ductility. When the ST treatment was carried out at 1298 K higher than the ¢ transformation temperature, the microstructure was almost the same as that of the SLM material and the mechanical properties were not greatly altered. AG treatment of the ST-treated materials induced the precipitation of the small ¡ phase and reduced the volume fraction of the metastable ¢ phase. This treatment improved the static strength but reduced the ductility. The fatigue strength of the SLM material was much lower than that of the wrought material (63%) because the molding defects formed inside caused stress concentration and accelerated the initiation of fatigue cracks. However, the ST treatment at 1298 K and its combination with AG treatment effectively suppressed the initiation of fatigue cracks and markedly improved the fatigue strength to the same level as that of the wrought material. To improve the fatigue strength, the ST treatment at 1298 K was more effective than its combination with AG treatment because the volume fraction of the metastable ¢ phase was higher and the compressive residual stress near the surface was higher.

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“…In recent years, more and more attention has been attracted on additive manufacturing (AM) technology due to its solid freeform fabrication, material saving, time saving and so on. [1][2][3][4][5] Selective laser melting (SLM), which is one of additive manufacturing technology, has got notice from a series of industries like military field, automotive field and aerospace field as it can achieve the formation of the metal part. [6][7][8][9][10] What's more, as the layer by layer forming from the bottom of the manufactured part, this method makes it possible to manufacture any complex structure part in theory.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Laser Power and Scan Speed in SLM

Han¹,

Duan

Mao

et al. 2022

ISIJ Int.

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With the rapid development of selective laser melting technology, the effect of different process parameters on the quality of the printed parts was studied by many researchers in recent years. In this work, a comparison on the effect of laser power and scan speed which was considered as two main factors to affect laser power density, was studied. An inner structure part with overhanging surface was designed and printed to better study the influence on the surface quality caused by these two factors. The testing results revealed that with the same energy density, different performance can be observed on the overhanging and side surface quality caused by laser power and scan speed. With the increasing of the laser power, side surface roughness value showed an increasing trend due to the increasing of the temperature gradient of the molten pool while the overhanging surface quality had a descending trend. It was mainly due to the fact that to keep the same laser power density, the scan speed decreased which resulted to the increasing time for solidification of the molten pool. This phenomenon lead to the increasing of the sinking distance and the overhanging surface quality showed a decline trend. KEY WORDS: selective laser melting (SLM); inner structure part; laser power; scan speed; inner surface quality.

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Fundamental Properties of Ti-6Al-4V Alloy Produced by Selective Laser Melting Method

Cited by 13 publications

References 25 publications

Rapid Oxynitriding of Ti–6Al–4V Alloy by Induction Heating in Air

Rapid Oxynitriding of Ti–6Al–4V Alloy by Induction Heating in Air

Short-Time Heat Treatment for Ti–6Al–4V Alloy Produced by Selective Laser Melting

Comparison of Laser Power and Scan Speed in SLM

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