Tensile and fatigue crack growth behavior of commercially pure titanium produced by laser powder bed fusion additive manufacturing

Hasib, M. Tarik; Ostergaard, Halsey E.; Liu, Qian; Li, Xiao Peng; Kruzic, Jamie J.

doi:10.1016/j.addma.2021.102027

Cited by 28 publications

(19 citation statements)

References 86 publications

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“…A significant study on the fatigue behavior of AM CPTi was conducted by Hasib et al [29]. They discussed the correlation between the building orientation in LPBF and fatigue.…”

Section: Discussionmentioning

confidence: 99%

Comparison of the fatigue life of pure titanium and titanium alloy clasps manufactured by laser powder bed fusion and its prediction before manufacturing

et al. 2023

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In this study, the fatigue properties of additively manufactured titanium clasps were compared with those of commercially pure titanium (CPTi) and Ti-6Al-4V (Ti64), manufactured using laser powder-bed fusion. Methods: Fourteen specimens of each material were tested under the cyclic condition at 1 Hz with applied maximum strokes ranging from 0.2 to 0.5 mm, using a small stroke fatigue testing machine. A numerical approach using finite element analysis (FEA) was also developed to predict the fatigue life of the clasps. Results: The results showed that although no significant differences were observed between the two materials when a stroke larger than 0.35 mm was applied, CPTi had a better fatigue life under a stroke smaller than 0.33 mm. The distributions of the maximum principal stress in the FEA and the fractured position in the experiment were in good agreement. Conclusions: Using a design of the clasp of the present study, the advantage of the CPTi clasp in its fatigue life under a stroke smaller than 0.33 mm was revealed experimentally. Furthermore, the numerical approach using FEA employing calibrated parameters for the Smith-Watson-Topper method are presented. Under the limitations of the aforementioned clasp design, the establishment of a numerical method enabled us to predict the fatigue life and ensure the quality of the design phase before manufacturing.

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“…A significant study on the fatigue behavior of AM CPTi was conducted by Hasib et al [29]. They discussed the correlation between the building orientation in LPBF and fatigue.…”

Section: Discussionmentioning

confidence: 99%

Comparison of the fatigue life of pure titanium and titanium alloy clasps manufactured by laser powder bed fusion and its prediction before manufacturing

et al. 2023

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“…The measured nitrogen in this work exceeded that with values in the range of 3 wt% using standardless quantification, depending on the scanning pattern and location of scan. In one study using X-ray diffraction, the weight percent of nitrogen was found to be higher in CpTi when produced from laser powder bed fusion (LPBF) additive than the wrought CpTi [43]. In general, the nitrogen content exceeded the grade 2 specification.…”

Section: Discussionmentioning

confidence: 99%

“…The additive samples were created in an argon atmosphere, yet they assume that nitrogen impurities were picked up from the LPBF chamber. In addition, they claim higher temperatures lead to more nitrogen pick-up [43].…”

Section: Discussionmentioning

confidence: 99%

Analysis of Face-Centered Cubic Phase in Additively Manufactured Commercially Pure Ti

Adams,

Field

2023

Metals

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Metal additive manufacturing is a developing technique with numerous advantages and challenges to overcome. As with all manufacturing techniques, the specific raw materials and processing parameters used have a profound influence on microstructures and the resulting behavior of materials. It is important to understand the relationship between processing and microstructures of Ti to advance knowledge of Ti-alloys in the additive field. In this study, a face-centered cubic (FCC) phase was found in grade 2 commercially pure titanium specimens, additively manufactured with directed energy deposition in an argon atmosphere. Two scanning speeds (500 and 1000 mm/min) and three scanning patterns (cross-hatched and unidirectional patterns) were investigated. Electron backscatter diffraction and energy-dispersive X-ray spectroscopy were used for microstructural and compositional analysis. Inverse pole figure, phase, and kernel average misorientation (KAM) maps were analyzed in this work. Larger amounts of the FCC phase were found in the unidirectional scanning patterns for the slower scanning speed, while the cross-hatched pattern for both scanning speeds showed a lower amount of FCC. Higher KAM averages were present in the faster scanning speed specimens. According to EDS scans, small amounts of nitrogen were uniformly distributed throughout the specimens, leading to the possibility of interstitial content as a contributing factor for development of the observed FCC phase. However, there is no clear relationship between nitrogen and the FCC phase. The formation of this FCC phase could be connected to high densities of crystalline defects from processing, plastic deformation, or the distribution of interstitials in the AM structure. An unexpected Kurdjumow–Sachs-type orientation relationship between the parent beta phase and FCC phase was found, as 110BCC∥111FCC, 111BCC∥110FCC.

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“…Для решения этих задач может быть использована технология селективного лазерного сплавления (СЛС) -активно развивающаяся аддитивная тех-нология 3D-печати, позволяющая создавать прецизионные изделия сложной формы [10][11][12]. Несмотря на большое число исследований, направленных на повышение механических характеристик СЛС-титана [13][14][15][16][17][18][19][20], задача значительного повышения прочности нелегированного титана еще не решена и остается весьма актуальной.…”

Section: Introductionunclassified

Улучшение Физико-Механических Характеристик Нелегированного Титана Вт1-0 И Исследование Влияния На Них Режимов Селективного Лазерного Сплавления

Грязнов¹,

Шотин²,

Чувильдеев³

et al. 2023

Журнал Технической Физики

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Comprehensive studies of the physical and mechanical properties and structure of VT1-0 titanium samples processed by selective laser melting have been carried out. High strength characteristics (the ultimate tensile strength of 820 MPa, the yield strength of 710 MPa) have been achieved. These values exceed by 2 times the values for this material produced using conventional technology. The formation of the martensitic αʹ-phase, obtained due to the high crystallization rates realized in selective laser melting process, is the reason for the increase in the mechanical characteristics of titanium VT1-0. Mechanical characteristics of titanium VT1-0 subjected to high-temperature annealing demonstrated a monotonous decrease in strength parameters by 15% and an increase in plastic characteristics by 30%. It is shown that the technology of selective laser melting makes it possible to solve the problem of improving the strength characteristics of unalloyed titanium to create a new class of medical devices.

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Tensile and fatigue crack growth behavior of commercially pure titanium produced by laser powder bed fusion additive manufacturing

Cited by 28 publications

References 86 publications

Comparison of the fatigue life of pure titanium and titanium alloy clasps manufactured by laser powder bed fusion and its prediction before manufacturing

Comparison of the fatigue life of pure titanium and titanium alloy clasps manufactured by laser powder bed fusion and its prediction before manufacturing

Analysis of Face-Centered Cubic Phase in Additively Manufactured Commercially Pure Ti

Улучшение Физико-Механических Характеристик Нелегированного Титана Вт1-0 И Исследование Влияния На Них Режимов Селективного Лазерного Сплавления

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