Current capabilities of the residual stress diffractometer at the high flux isotope reactor

Cornwell, P; Bunn, Jeffrey R.; Fancher, Chris M.; Payzant, E. Andrew; Hubbard, Camden R.

doi:10.1063/1.5037593

Cited by 33 publications

(10 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rst experiment (i.e., TSR) was performed on the NRSF2 beamline at the Oak Ridge National Laboratory (ORNL) in Oak Ridge, USA and the second (i.e., TSR + Chills and T7) and third (i.e., T4 and T7LM) were performed on the Kowari beamline at the Australia Nuclear Science and Technology Organization (ANSTO) in Lucas Heights, Australia. The instrument setup for ORNL and ANSTO are described in detail in [13], [14]. The analysis was performed from the top (z = 6 mm) to bottom (z = 146 mm) of the center of the middle and edge cylinder bridges of non-sectioned engine blocks (see Fig.…”

Section: Methodsmentioning

confidence: 99%

Evolution of residual stress through the processing stages in manufacturing of bore-chilled sand-cast aluminum engine blocks with pressed-in iron liners

Stroh

Sediako

Lombardi

et al. 2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

The cumulative global emissions produced by the automotive industry over the last decade has put a tremendous strain on the environment. Consequently, automotive engineers and manufacturers have been forced to improve the e ciencies of their automobiles which is frequently accomplished by increasing the operating pressure, and therefore temperature, of the combustion engine. Unfortunately, in addition to the rise in operational pressures and temperatures, large tensile residual stresses often accumulate in the cylinder bridges during the casting process of aluminum engine blocks due to the use of cast-in iron cylinder liners, leading to combined stress magnitudes above the strength of the currently used aluminum alloys. Thus, the present study aims to characterize the evolution of residual stress, with application of neutron diffraction, at several critical stages of the manufacturing process of sand-cast aluminum engine blocks that have eliminated the iron cylinder liners from the casting process and replaced them with cylinder bore chills that are pressed-out after the thermal sand reclamation process.The replacement of the iron liners shifted the stress mode from purely tension to purely compression until the bore chills were removed. Following removal of the bore chills, the maximum tensile stress at the top of the cylinder bridge was ~70% lower than the engine's predecessor which was produced with iron liners. Moreover, in the production-ready state (i.e., T7 heat treated, machined and press-t liners inserted), the stress mode maintains the partially compressive nature with low magnitudes of tension, thereby lowering the material's susceptibility to crack growth and propagation.

show abstract

Section: Methodsmentioning

confidence: 99%

Evolution of residual stress through the processing stages in manufacturing of bore-chilled sand-cast aluminum engine blocks with pressed-in iron liners

Stroh

Sediako

Lombardi

et al. 2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…Further details regarding the experimental setup can be found in. [ 12,32 ] All of the following experiments were performed at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Mapping of Texture and Phase Fractions in Heterogeneous Stress States during Multiaxial Loading of Biomedical Superelastic NiTi

et al. 2020

View full text Add to dashboard Cite

Thermoelastic deformation mechanisms in polycrystalline biomedical‐grade superelastic NiTi are spatially mapped using in situ neutron diffraction during multiaxial loading and heating. The trigonal R‐phase is formed from the cubic phase during cooling to room temperature and subsequently deforms in compression, tension, and torsion. The resulting R‐phase variant microstructure from the variant reorientation and detwinning processes are equivalent for the corresponding strain in tension and compression, and the variant microstructure is reversible by isothermal loading. The R‐phase variant microstructure is consistent between uniaxial and torsional loading when the principal stress directions of the stress state are considered (for the crystallographic directions observed here). The variant microstructure evolution is tracked and the similarity in general behavior between uniaxial and torsional loading, in spite of the implicit heterogeneous stress state associated with torsional loading, pointed to the ability of the reversible thermoelastic transformation in NiTi to accommodate stress and strain mismatch with deformation. This ability of the R‐phase, despite its limited variants, to accommodate stress and strain and satisfy strain incompatibility in addition to the existing internal stresses has significance for reducing irrecoverable deformation mechanisms during loading and cycling through the phase transformation.

show abstract

“…These measurements were performed using the High Flux Isotope Reactor at Oak Ridge National Laboratory's (ORNL) 2 nd Generation Neutron Residual Stress Facility (Ref. 16). At each measurement point, lattice strains were calculated from the corresponding measured d-spacing changes in three orthogonal directions.…”

Section: Stress Measurement Using the Neutron Diffraction Methodsmentioning

confidence: 99%

•Exploring the Cooling Process for Residual Stress Reduction in Dissimilar Welds

2018

View full text Add to dashboard Cite

Current capabilities of the residual stress diffractometer at the high flux isotope reactor

Cited by 33 publications

References 12 publications

Evolution of residual stress through the processing stages in manufacturing of bore-chilled sand-cast aluminum engine blocks with pressed-in iron liners

Evolution of residual stress through the processing stages in manufacturing of bore-chilled sand-cast aluminum engine blocks with pressed-in iron liners

Mapping of Texture and Phase Fractions in Heterogeneous Stress States during Multiaxial Loading of Biomedical Superelastic NiTi

•Exploring the Cooling Process for Residual Stress Reduction in Dissimilar Welds

Contact Info

Product

Resources

About