Dynamic behavior and thermomechanical characterization of laser powder bed fusion and wrought Ti–6Al–4V

Salehi, Seyyed-Danial; Beal, Roger; Kingstedt, Owen T.

doi:10.1016/j.ijimpeng.2023.104552

Cited by 3 publications

(4 citation statements)

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“…A relatively random texture has been achieved as is evidenced by the

α

‐phase pole figure triad. From the presented microstructure data, it can be seen that the one‐step annealing HT has sufficiently transformed any

α^{'}

‐phase martensitic laths into the

β

‐phase when exceeding the

β

‐transus temperature which upon cooling have become

α

‐phase lamella 15 …”

Section: Resultsmentioning

confidence: 91%

“…The three HTs utilized match those of Salehi et al 15 Two HTs exceeding the

β

‐transus temperature (995° C) were selected, the first of which has a single dwell period followed by air cooling, and the second has two dwell periods, the second of which is an annealing step. Both of these HTs were inspired by the work of Kumar and Ramamurty 16 and are intended to increase ductility and fracture toughness while relieving residual stresses.…”

Section: Methodsmentioning

confidence: 99%

“…From the presented microstructure data, it can be seen that the one-step annealing HT has sufficiently transformed any α 0 -phase martensitic laths into the β-phase when exceeding the β-transus temperature which upon cooling have become α-phase lamella. 15 The two-step annealing HT, which is intended to increase fracture toughness and relieve residual stresses, The sawtooth HT is an attempt to achieve an equiaxed or bimodal structure solely through thermal processing. In Ti-6Al-4V, the equiaxed structure is typically accomplished by mechanical deformation processes such as rolling (as shown by the wrought material condition in Figure 3) which are not directly applicable to net shape LPBF components.…”

Section: Microstructurementioning

confidence: 99%

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Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

Beal,

Salehi,

Kingstedt

2024

Fatigue Fract Eng Mat Struct

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In this study, laser powder bed fusion (LPBF)‐produced Ti‐6Al‐4V is subjected to three separate post‐build heat treatments (HTs), specifically (1) a one‐step annealing HT exceeding the ‐transus temperature, (2) a two‐step annealing HT whose first step exceeds the ‐transus temperature and the second step is an anneal below the ‐transus temperature, and (3) a sawtooth HT with temperatures oscillating below the ‐transus temperature. Tensile properties and fatigue crack growth behavior were assessed and compared to wrought Ti‐6Al‐4V. LPBF materials nominally exhibited a 17% yield stress reduction, 1.9% strain‐to‐failure increase, and 9.2% modulus of toughness decrease. Fatigue crack growth curves were used to assess the linear crack growth rate region and approximate fracture toughness (). Post‐mortem fractography observed striations indicating the crack growth direction frequently changes direction providing an understanding of the slower crack growth rates observed in LPBF materials compared to their wrought counterpart.

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“…A relatively random texture has been achieved as is evidenced by the

α

‐phase pole figure triad. From the presented microstructure data, it can be seen that the one‐step annealing HT has sufficiently transformed any

α^{'}

‐phase martensitic laths into the

β

‐phase when exceeding the

β

‐transus temperature which upon cooling have become

α

‐phase lamella 15 …”

Section: Resultsmentioning

confidence: 91%

“…The three HTs utilized match those of Salehi et al 15 Two HTs exceeding the

β

Section: Methodsmentioning

confidence: 99%

Section: Microstructurementioning

confidence: 99%

See 1 more Smart Citation

Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

Beal,

Salehi,

Kingstedt

2024

Fatigue Fract Eng Mat Struct

Self Cite

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“…Titanium alloys have an excellent dynamic deformation ability [1]. Therefore, titanium alloys have a large number of applications in the fields of armor, aerospace, and vehicles that are resistant to high-speed impacts [2][3][4][5][6]. At this stage, the enhancement of the resistance of homogeneous materials to high-velocity impacts by conventional means is at its upper limit.…”

Section: Introductionmentioning

confidence: 99%

Influence of Interface Type on Dynamic Deformation Behavior of 3D-Printed Heterogeneous Titanium Alloy Materials

Li,

Luo,

Wang

et al. 2024

Materials

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Using the Split Hopkinson Pressure Bar technique, strain-limited dynamic compressive loading experiments were performed on TA1/TA15 heterostructure (HS) materials. The plastic deformation mechanisms, fracture forms, and energy absorption properties of an HS material with a metallurgical bonding interface (MB) and an HS material without a metallurgical bonding interface (NMB) are compared and analyzed. The results show that there is no significant difference between the two deformation mechanisms. The fracture forms are all “V-shaped” fractures within the TA1 part. The NMB was carried for 57 μs before failure and absorbed 441 J/cm3 of energy. The MB was carried for 72 μs before failure and absorbed 495 J/cm3 of energy. Microstructure observations show that there is a coordinated deformation effect near the MB interface compared to the NMB, with both TA1 and TA15 near the interface carrying stresses. This causes an enhancement of the MB load-bearing time and a 12% increase in energy absorption.

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Critical assessment and demonstration of high-emissivity coatings for improved infrared signal quality for Taylor–Quinney coefficient experimentation

Salehi

Kingstedt

2023

International Journal of Impact Engineering

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Dynamic behavior and thermomechanical characterization of laser powder bed fusion and wrought Ti–6Al–4V

Cited by 3 publications

References 50 publications

Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

Additively manufactured Ti‐6Al‐4V microstructure tailoring for improved fatigue life performance

Influence of Interface Type on Dynamic Deformation Behavior of 3D-Printed Heterogeneous Titanium Alloy Materials

Critical assessment and demonstration of high-emissivity coatings for improved infrared signal quality for Taylor–Quinney coefficient experimentation

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