Residual stress measurements of laser metal deposited Ti-6Al-4V parts using neutron diffraction

Em, V. T.; Ivanov, S. Yu.; Karpov, I. D.; Rylov, S. A.; Zemlyakov, Evgeniy; Babkin, Konstantin

doi:10.1088/1742-6596/1109/1/012049

Cited by 9 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Titanium and its alloys have been investigated by neutron diffraction under various conditions and manufacturing processes. [15][16][17][18] Being mainly an hcp metal, Ti64 exhibits anisotropic behavior typical of metals possessing the same crystal structure. [19] In this study, the lattice plane response to mechanical loading is investigated and compared to the response from thermally induced strains.…”

Section: Introductionmentioning

confidence: 99%

Neutron Diffraction Measurements of Forged Ti–6A–4V Alloy under Tensile Loading

et al. 2022

View full text Add to dashboard Cite

Herein, lattice‐specific elastic stiffnesses of a structural alloy with commercial, medical, and military aircraft applications are investigated by neutron diffraction. Macroscopic mechanical properties are characterized by conventional techniques and response to thermally induced strains is probed by X‐ray diffraction (XRD); these findings are compared to data given by neutron diffraction tools. The material used in this study is the forged Ti64 titanium alloy (6% aluminum and 4% vanadium). Diffraction elastic constants are found to range from 114 GPa to 138 GPa. Macroscopic moduli of 118 GPa and 116 GPa are found from extensometry and digital imaging correlation, respectively. The (101) reflection is the reflection that best matches the macroscopic material behavior with a modulus of 117 GPa for the studied material. The effect of mechanical and thermal strains on the axial ratio of the crystal structure is investigated. Texture is an important consideration when comparing micro‐ and macro‐scale behavior; texture from electron backscatter diffraction (EBSD) maps reveals minimal preferred orientation for the material under study thus indicating (101) planes suitably reflect overall material behavior.

show abstract

Section: Introductionmentioning

confidence: 99%

Neutron Diffraction Measurements of Forged Ti–6A–4V Alloy under Tensile Loading

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In contrast to the temperature field, which disappears after cooling, the stresses field does not disappear due to irreversible nature. Therefore, after complete cooling there are residual strains and stresses in the fabricated part [11][12][13][14]. The main factors affecting the stress and strain fields are the shape and the size of the buildup, the process parameters, the thermomechanical and the thermophysical properties of the deposited material and the interlayer dwell time [8,15,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Inter-Layer Dwell Time on Distortion and Residual Stresses of Laser Metal Deposited Wall

Ivanov

Vildanov

Golovin

et al. 2019

KEM

View full text Add to dashboard Cite

The laser metal deposition is an advanced manufacturing technology enabling the production of large-sized parts and partially or completely elimination of machining and welding. The process is characterised by a non-uniform local heating of the buildup leading to a stress distribution, which may exceed the yield strength of the material and leads to loss of dimensional accuracy. The interlayer dwell time has a strong influence on the temperature field. The effect of the interlayer dwell time on the distortion and the stress distribution during laser metal deposition of a single-pass wall on the edge of 2 mm thick plate was studied experimentally and numerically. The deposited material was IN625 and the substrate material was AISI 316. A decrease of the residual displacement, due to a uniform shrinkage after the deposition of the last layer and a lower level of the residual compressive longitudinal plastic strain, has been observed in the studies without a dwell time. The peak increment of the free edge displacement corresponds to the first layer and hence the subsequent layers will be deposited on the already plastically deformed buildup. The tensile residual longitudinal stress near the top of the buildup and transverse stress near the edges of the buildup is higher than yield strength in the studies with dwell time.

show abstract

Connecting Diffraction-Based Strain with Macroscopic Stresses in Laser Powder Bed Fused Ti-6Al-4V

Mishurova

Artzt

Haubrich

et al. 2020

Metall Mater Trans A

View full text Add to dashboard Cite

The laser powder bed fusion (LPBF) production process often results in large residual stress (RS) in the parts. Nondestructive techniques to determine RS are badly needed. However, a reliable quantification of macro-RS (i.e., stress at the component level) by means of diffraction-based techniques is still a great challenge, because the link between diffraction-based strain and macro-RS is not trivial. In this study, we experimentally determine (by means of in-situ synchrotron radiation diffraction) this link for LPBF Ti-6Al-4V. We compare our results with commonly used models to determine the so-called diffraction elastic constants (DECs). We show that LPBF materials possess different DECs than wrought alloys, simply because their microstructural and mechanical properties are different. We also show that the existing models can be used to calculate DECs only if high accuracy of the RS values is not required. If the peculiarities of the microstructure have to be taken into account (as is the case of additively manufactured materials), a radically new approach is desirable.

show abstract

Residual stress measurements of laser metal deposited Ti-6Al-4V parts using neutron diffraction

Cited by 9 publications

References 16 publications

Neutron Diffraction Measurements of Forged Ti–6A–4V Alloy under Tensile Loading

Neutron Diffraction Measurements of Forged Ti–6A–4V Alloy under Tensile Loading

Effect of Inter-Layer Dwell Time on Distortion and Residual Stresses of Laser Metal Deposited Wall

Connecting Diffraction-Based Strain with Macroscopic Stresses in Laser Powder Bed Fused Ti-6Al-4V

Contact Info

Product

Resources

About