Residual stress measurement on Titanium Grade 5 and Inconel 625 thin dissimilar welded joints by contour method

Carone, Simone; Moramarco, Vincenzo; Pappalettera, Giovanni; Barbieri, G.; Casavola, Caterina

doi:10.1007/s10853-021-06581-y

Cited by 9 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This technique is easily applicable and particularly suitable to welded joints, owing to the fact that it is not affected by microstructural changes and inhomogeneities, and it is capable of capturing even steep stress gradients [44,45]. Indeed, it has been successfully employed on dissimilar joints, especially friction-welded [42,[46][47][48][49]; • since the contour method is a destructive technique and capable of measuring only one stress component per each cut, longitudinal stresses, which are generally larger in magnitude, should be measured as first followed by transverse stress; • subsequently, fatigue tests have to be performed in conjunction with a thermographic analysis of the increase in surface temperature of the specimens to monitor the failure zone [43];…”

Section: Methodsmentioning

confidence: 99%

“…To manufacture the complex dissimilar joints examined, two inserts of pure Vanadium and AISI 304 were selected to join Ti6Al4V and Inconel 625 to inhibit the formation of Ti x Ni y brittle phases. Additional information on the selection of this particular combination of interlayers can be found in [42,43]. Table 1 reports the nominal chemical compositions of the base metals and Vanadium, as well as the chemical composition of AISI 304 measured by X-ray Fluorescence (XRF).…”

Section: Materials and Welding Conditionsmentioning

confidence: 99%

“…The aim of this research is to propose a comprehensive experimental approach to characterize the fatigue behavior of dissimilar joints, taking into account the relationship with residual stresses and fracture modes. A complex 2-mm-thick laser-welded Ti6Al4V/Inconel 625 dissimilar welded joint with intermediate inserts of Vanadium and AISI 304 was considered as case study [42,43]. Titanium alloys combine high strength with good corrosion resistance, while Inconel alloys exhibit superior mechanical properties even at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Innovative Approach for the Evaluation of the Mechanical Behavior of Dissimilar Welded Joints

Carone

Corigliano

Moramarco

et al. 2022

Metals

Self Cite

View full text Add to dashboard Cite

This study aims to propose a thorough experimental methodology to assess the mechanical quality of dissimilar joints. This comprehensive approach investigates the fatigue behavior by exploiting the thermographic method, accompanying and correlating the results with information obtained from extensive measurements of residual stresses and detailed evaluation of fracture surfaces. The integration of the information obtained by this hybrid approach allows for a deeper understanding in terms of fatigue behavior even in complicated situations as those represented by dissimilar welded joints. A complex laser-welded Ti6Al4V/Inconel 625 dissimilar joint, obtained using intermediate inserts of Vanadium and AISI 304, was considered as case study. The residual stresses, both longitudinal and transverse to the weld beads, were measured on surface by means of X-ray diffraction, whereas, for in-depth measurements, the multiple-cut contour method was implemented to determine full 2D maps of longitudinal residual stresses with the first cut, and transverse stresses in the Vanadium insert with the second cut. In the investigation of longitudinal residual stresses, the area mostly affected by harmful tensile residual stresses is the weld between the stainless steel and Vanadium, where the maximum value of about 560 MPa is reached; the analysis of transverse residual stresses highlighted a maximum value of 350 MPa at the core of the Vanadium insert. The fatigue behavior of the joints was investigated along with a detailed analysis of the fractured surfaces by scanning electron and confocal microscopes. The analysis of the fracture surfaces indicated that the failure modes are mainly related to the occurrence of defects on the crack path, especially at stress range higher than 200 MPa, for which a large number of pores cluster were detected. Nevertheless, the crack initiation is usually on the side of Vanadium. When the crack path deviates on the stainless-steel region, the fracture mode is brittle due to high residual stresses.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Materials and Welding Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Innovative Approach for the Evaluation of the Mechanical Behavior of Dissimilar Welded Joints

Carone

Corigliano

Moramarco

et al. 2022

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…Before measuring the deformed surfaces, the sectioned specimens were held for several hours in a temperature-controlled laboratory to ensure thermal equilibrium. Displacements in the direction perpendicular to the cut surfaces were measured by means of fringe projection, a full-eld optical technique recently proposed by the authors [55]. The schematic set-up representation is displayed in Fig.…”

Section: Residual Stress Measurement Set-up and Proceduresmentioning

confidence: 99%

“…A sequence of sinusoidal fringe patterns is projected onto the surface to be acquired, consequently these fringes are modulated in phase by the height distribution of the surface itself and acquired by a camera with a resolution of 2 MPix (1624 × 1234 pixels). By analyzing the images, the 3D coordinates of the sample surface are reconstructed from the acquired phase map [55][56][57]. For each specimen analyzed, the point clouds measured on the two sides of the cut were aligned and averaged to eliminate the contribution of shear stresses.…”

Section: Residual Stress Measurement Set-up and Proceduresmentioning

confidence: 99%

Residual stress evaluation in innovative layer-level continuous functionally graded materials produced by Powder Bed Fusion-Laser Beam

Campanelli,

Carone,

Casavola

et al. 2024

Preprint

Self Cite

View full text Add to dashboard Cite

Powder Bed Fusion-Laser Beam (PBF-LB) can manufacture advanced multi-material metal components that outperform conventional material restrictions by combining different properties within a single structure. This process increasingly incorporates functionally graded materials (FGMs) to facilitate smooth transitions between dissimilar materials. However, high thermal gradients experienced by materials during construction can result in the development of a complex and high residual stress field. If not adequately managed, component failure is possible, even during construction. The main objective of this study is to evaluate residual stresses in AISI 316L and 18Ni Maraging 300 FGMs with continuous variation of composition within a single layer, using the contour method. The manufacture of this kind of layer-level continuous FGMs by employing PBF-LB system utilizing a blade/roller-based powder spreading technique has only been recently devised and a proper residual stress analysis is still required. In fact, as the mechanical properties in additively manufactured samples are significantly influenced by the direction of construction, the same holds true for the direction along which the compositional variation is made. Furthermore, in this study the impact of solution annealing and aging heat treatment, necessary for enhancing the mechanical properties of martensitic steel, on residual stresses was explored. Additionally, the effect of adopting material-differentiated process parameters was investigated. The results indicated that each specimen displayed areas of tensile stress concentration on the upper and lower surfaces, balanced by compression in the center. The application of heat treatment led to a decrease in the maximum tensile stress and provided a uniform and significant stress reduction within the maraging steel. Finally, the implementation of material-specific process parameters for the three composition zones in conjunction with the heat treatment resulted in a reduction in the maximum residual stress of 35% and also a significantly lower residual stress field throughout the specimen.

show abstract

Residual stress evaluation in innovative layer-level continuous functionally graded materials produced by Powder Bed Fusion-Laser Beam

Campanelli,

Carone,

Casavola

et al. 2024

Int J Adv Manuf Technol

View full text Add to dashboard Cite

The main objective of this study is to evaluate residual stresses in AISI 316L and 18Ni Maraging 300 functionally graded materials with continuous variation of composition within a single layer using the contour method. The manufacture of this kind of layer-level continuous functionally graded materials by employing a Powder Bed Fusion-Laser Beam system utilizing a blade/roller-based powder spreading technique has only been recently devised and a proper residual stress analysis is still required. In fact, as the mechanical properties of additively manufactured samples are significantly influenced by the direction of construction, the same holds true for the direction along which the compositional variation is made. Furthermore, in this study, the impact of solution annealing and aging heat treatment, which are necessary for enhancing the mechanical properties of martensitic steel, on residual stresses was explored. Additionally, the effect of adopting material-differentiated process parameters was investigated. The results indicated that each specimen displayed areas of tensile stress concentration on the upper and lower surfaces, balanced by compression in the center. The application of heat treatment led to a decrease in the maximum tensile stress of 8% and provided a uniform and significant stress reduction within the maraging steel. Finally, the implementation of material-specific process parameters for the three composition zones in conjunction with the heat treatment resulted in a reduction in the maximum residual stress of 35% and also a significantly lower residual stress field throughout the specimen.

show abstract

Residual stress measurement on Titanium Grade 5 and Inconel 625 thin dissimilar welded joints by contour method

Cited by 9 publications

References 42 publications

Innovative Approach for the Evaluation of the Mechanical Behavior of Dissimilar Welded Joints

Innovative Approach for the Evaluation of the Mechanical Behavior of Dissimilar Welded Joints

Residual stress evaluation in innovative layer-level continuous functionally graded materials produced by Powder Bed Fusion-Laser Beam

Residual stress evaluation in innovative layer-level continuous functionally graded materials produced by Powder Bed Fusion-Laser Beam

Contact Info

Product

Resources

About