Residual stress in a laser welded EUROFER blanket module assembly using non-destructive neutron diffraction techniques

Hughes, Darren J.; Koukovini-Platia, Eirini; Heeley, Ellen L.

doi:10.1016/j.fusengdes.2013.12.041

Cited by 6 publications

(9 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A common assumption for thin welded plates, as is the case for the work-pieces investigated in this paper, is a state of plane stress. [19][20][21][22] Using this plane-stress assumption, a d 0 (or sin h 0 ) value is applied at each measurement location to force the normal stress to zero. The in-plane stresses, calculated with the same d 0 value, are thus corrected.…”

Section: B Determination Of Strain-free Reference Parametermentioning

confidence: 99%

“…Although far-field values are commonly used for the d 0 value, microstructural changes, as a result of welding, are known to lead to a variation in the d 0 value across the weld. [16,21] In such cases, a global reference d 0 value cannot be assumed; [16] hence, it is necessary to obtain the distribution of d 0 as a function of distance from the weld center for accurate strain calculations.…”

Section: Plane-stress Correctionmentioning

confidence: 99%

“…A similar relation between hardness and pseudostrain was found in other works. [21] Figure 12 shows a pseudo-strain difference of approximately 800 9 10 À6 between the hard nugget and relatively soft BM of the DP600 work-piece. This is to be expected, as both regions have undergone significantly different processing routes, leading to different microstructures.…”

Section: Plane-stress Correctionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds

Raath

Norman

McGregor

et al. 2017

Metall Mater Trans A

View full text Add to dashboard Cite

2017) Effect of weld schedule on the residual stress distribution of boron steel spot welds. Metallurgical and Materials Transactions A, 48 (6). pp. 2900-2914. Permanent WRAP URL:Press-hardened boron steel has been utilized in anti-intrusion systems in automobiles, providing high strength and weight-saving potential through gage reduction. Boron steel spot welds exhibit a soft heat-affected zone which is surrounded by a hard nugget and outlying base material. This soft zone reduces the strength of the weld and makes it susceptible to failure. Additionally, different welding regimes lead to significantly different hardness distributions, making failure prediction difficult. Boron steel sheets, welded with fixed and adaptive schedules, were characterized. These are the first experimentally determined residual stress distributions for boron steel resistance spot welds which have been reported. Residual strains were measured using neutron diffraction, and the hardness distributions were measured on the same welds. Additionally, similar measurements were performed on spot welded DP600 steel as a reference material. A correspondence between residual stress and hardness profiles was observed for all welds. A significant difference in material properties was observed between the fixed schedule and adaptively welded boron steel samples, which could potentially lead to a difference in failure loads between the two boron steel welds.

show abstract

Section: B Determination Of Strain-free Reference Parametermentioning

confidence: 99%

Section: Plane-stress Correctionmentioning

confidence: 99%

Section: Plane-stress Correctionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds

Raath

Norman

McGregor

et al. 2017

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…It is used as the European reference material for the EU-DEMO reactor because of its excellent mechanical properties: creep life, fracture, strength, and ductility ( 5 , 6 ). When joining Eurofer97, laser welding does, however, induce significant residual stresses, up to c.800 MPa, as a result of the nonuniform deformation caused by the thermal cycle and the martensite phase transformation, which takes place after welding ( 7 , 8 ).…”

Section: Introductionmentioning

confidence: 99%

“…Many techniques can be used to characterize the residual stress distribution in metallic materials, e.g., neutron diffraction (7,8,10), hole drilling (11), and laboratory-based and synchrotron-based x-ray diffraction (XRD) techniques (12)(13)(14). For example, some attempts have been made to study the residual stress distribution in laser-welded Eurofer97 by the neutron diffraction, where the resolution is over a millimeter for macroscale characterization (8,10). Microscale residual stress characterization is therefore neglected because of low resolution.…”

Section: Introductionmentioning

confidence: 99%

A novel pathway for multiscale high-resolution time-resolved residual stress evaluation of laser-welded Eurofer97

et al. 2022

View full text Add to dashboard Cite

The plasma-facing components of future fusion reactors, where the Eurofer97 is the primary structural material, will be assembled by laser-welding techniques. The heterogeneous residual stress induced by welding can interact with the microstructure, resulting in a degradation of mechanical properties and a reduction in joint lifetime. Here, a Xe + plasma focused ion beam with digital image correlation (PFIB-DIC) and nanoindentation is used to reveal the mechanistic connection between residual stress, microstructure, and microhardness. This study is the first to use the PFIB-DIC to evaluate the time-resolved multiscale residual stress at a length scale of tens of micrometers for laser-welded Eurofer97. A nonequilibrium microscale residual stress is observed, which contributes to the macroscale residual stress. The microhardness is similar for the fusion zone and heat-affected zone (HAZ), although the HAZ exhibits around ~30% tensile residual stress softening. The results provide insight into maintaining structural integrity for this critical engineering challenge.

show abstract

Status of European reduced activation ferritic/martensitic steel EUROFER97

Rieth,

Aiello,

Zmitko

2025

Fusion Energy Technology R&D Priorities

View full text Add to dashboard Cite

Residual stress in a laser welded EUROFER blanket module assembly using non-destructive neutron diffraction techniques

Cited by 6 publications

References 15 publications

Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds

Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds

A novel pathway for multiscale high-resolution time-resolved residual stress evaluation of laser-welded Eurofer97

Status of European reduced activation ferritic/martensitic steel EUROFER97

Contact Info

Product

Resources

About