Microstructural evolution and microhardness of a selective-laser-melted Ti–6Al–4V alloy after post heat treatments

Wu, Songquan; Lu, Yanjin; Gan, Yuan; Huang, Ting‐Ting; Chen, Zhao; Guo, Sai; Lin, Jinxin

doi:10.1016/j.jallcom.2016.02.183

Cited by 201 publications

(74 citation statements)

References 30 publications

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“…Известно [13][14][15], что орторомбическая α ′′ -фаза может образовываться в сплаве Ti−6Al−4V в условиях высокой скорости охлаждения и высокой концентрации бета-стабилизирующих элементов. В частности, в работе [13] формирование α ′′ -фазы наблюдалось при закалке прокатанных образцов Ti−6Al−4V, в которых локальное содержание ванадия достигало 15 wt.%.…”

Section: результаты и их обсуждениеunclassified

Влияние охлаждения подложки на микроструктуру и фазовый состав изделий из титанового сплава Ti-6Al-4V, полученных методами аддитивных технологий

Перевалова¹,

Panin²,

Kazachenok³

2020

Журнал Технической Физики

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The microstructure, phase composition, and parameters of the -Ti based solid solution in the Ti-6Al-4V alloy obtained by 3D printing without cooling and with water cooling of the titanium substrate were studied by the methods of X-ray diffraction analysis, transmission diffraction and scanning electron microscopy, and optical metallography. It was found that the use of water cooling of the substrate leads to a decrease of the hereditary  grains sizes, an increase in the volume fraction of the  phase, a decrease in the volume fraction of the  phase and the total mean square displacement of atoms in the -Ti crystal lattice, as well as an increase in the elastic macrostrain of the samples.

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Section: результаты и их обсуждениеunclassified

Влияние охлаждения подложки на микроструктуру и фазовый состав изделий из титанового сплава Ti-6Al-4V, полученных методами аддитивных технологий

Перевалова¹,

Panin²,

Kazachenok³

2020

Журнал Технической Физики

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“…From Table 1, compared with published literatures, there is still some work for improvement in our heat treatment results, although the influence of different scanning strategies should be considered. According to the principle of maximum temperature and cooling rates [20,31], a group of more refined experiments could contribute to a detailed description in the microstructure evolution. In fact, the balance of tensile strength and elongation through heat treatment is more determined by an actual application's need.…”

Section: Tensile Propertiesmentioning

confidence: 99%

“…After the heat treatment, the average micro-hardness value was measured at 367.67 ± 7.33 HV1. Wang et al [31] chose a 1000 mm/s scanning speed to build a specimen with a hardness of about 400 HV. Vilaro et al [32] found that the sample was annealed at 800-850 • C, and the hardness decreased by about 20 HV after cooling, which was closely related to the precipitation of α phase.…”

Section: Micro-hardnessmentioning

confidence: 99%

“…Vilaro et al [32] found that the sample was annealed at 800-850 • C, and the hardness decreased by about 20 HV after cooling, which was closely related to the precipitation of α phase. Moreover, the hardness can be reduced by about 35 HV when annealing at 875 • C [31], although the hardness of the sample was slightly reduced after heat treatment. …”

Section: Micro-hardnessmentioning

confidence: 99%

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Research on Selective Laser Melting of Ti6Al4V: Surface Morphologies, Optimized Processing Zone, and Ductility Improvement Mechanism

Wang

Dou

Yang

2018

Metals

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Abstract:The quality and mechanical properties of titanium alloy fabricated using selective laser melting (SLM) are critical to the adoption of the process which has long been impeded by the lack of uniformity in SLM-fabrication parameter optimization. In order to address this problem, laser power and scanning speed were combined into linear energy density as an independent variable, while surface morphology was defined as a metric. Based on full-factor experiments, the surface quality of SLM-fabricated titanium alloy was classified into five zones: severe over-melting zone, high-energy density nodulizing zone, smooth forming zone, low-energy density nodulizing zone, and sintering zone. The mechanism resulting in the creation of each zone was analyzed. Parameter uniformity was achieved by establishing a parameter window for each zone, and it also revealed that under smooth forming conditions, the relationship of linear energy density to the quality of the formed surface is not linear. It was also found that fabrication efficiency could be improved in the condition of the formation of a smooth surface by increasing laser power and scanning speed. In addition, maximum elongation of the SLM-fabricated titanium alloy increased when the densified parts were processed using an appropriate heat treatment, from a low value of 5.79% to 10.28%. The mechanisms of change in ductility of the alloy were thoroughly analyzed from the perspectives of surface microstructure and fracture morphology. Results indicate that after heat treatment, the microcosmic structure of the alloy was converted from acicular martensite α' phase to a layered α+β double-phase structure, the fracture type also changed from quasi-cleavage to ductile fracture.

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“…Considering Table 1, it is reasonable to set the bonding agent sintering temperature as 800 °C and the heating rate as 60 K/min, which is shown in Table 3. Table 2 Table 3 2.4 Preparation of Ti6Al4V specimen and three point bending test Ti6Al4V specimens were prepared with Selective laser melting technology (M-lab, Concept laser) [34]. As shown in Fig.…”

Section: Composition Of Borate Bonding Agents and Their Thermal Propementioning

confidence: 99%

Microstructural evolution and microhardness of a selective-laser-melted Ti–6Al–4V alloy after post heat treatments

Cited by 201 publications

References 30 publications

Влияние охлаждения подложки на микроструктуру и фазовый состав изделий из титанового сплава Ti-6Al-4V, полученных методами аддитивных технологий

Влияние охлаждения подложки на микроструктуру и фазовый состав изделий из титанового сплава Ti-6Al-4V, полученных методами аддитивных технологий

Research on Selective Laser Melting of Ti6Al4V: Surface Morphologies, Optimized Processing Zone, and Ductility Improvement Mechanism

Evaluation to the effect of B2O3–La2O3–SrO–Na2O–Al2O3 bonding agent on Ti6Al4V–porcelain bonding

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