Sizing up mechanical testing: Comparison of microscale and mesoscale mechanical testing techniques on a FeCrAl welded tube

Gigax, Jonathan; Torrez, Avery; McCulloch, Q.; Kim, Hyosim; Maloy, Stuart A.; Li, Nan

doi:10.1557/jmr.2020.195

Cited by 10 publications

(3 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We do not explore the extent of damage caused by the technique, but rely on prior studies that have shown that the damage for metals is limited to a few micrometers below the surface. 7,8,19 It is not expected that, for the laser parameters used here, the damage should significantly exceed prior findings. For the 316L foil and AM91, a laseraffected region a few micrometers below the surface would comprise less than 5% of the response, well within the variation observed from measurements.…”

Section: Discussionmentioning

confidence: 51%

“…Gigax et al used femtosecond machining to create tensile samples for a coarse-grained metal which resulted in good correlation with that of bulk testing. 7 The HAZ in this study would have accounted for an insignificant fraction of the total gauge volume, meaning that its effects could be ignored. Another study also looked at the effects of the femtosecond laser process on the production of micropillars.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Demonstration of a High-Throughput Tensile Testing Technique Using Femtosecond Laser-Fabricated Tensile Bars in AISI 316 and Additively Manufactured Grade 91 Steel

Harvey

Torrez

Lam

et al. 2021

JOM

Self Cite

View full text Add to dashboard Cite

Femtosecond laser machining offers a fast, low damage route to fabricating features on the order of a few micrometers to millimeters. Within this broad application space, mechanical testing samples on this scale provides a combination of region selectivity and a bulk-like response. Use of such mechanical test specimens, however, is relatively unexplored compared to microscale and macroscale testing. The present study showcases the benefit of combining efficient specimen fabrication and testing on the mesoscale for extracting a more comprehensive picture of material mechanical properties. Moreover, a material with a complex and heterogeneous microstructure, additively manufactured grade 91, has also been studied to highlight the considerations needed and limitations of testing on this scale.

show abstract

Section: Discussionmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Demonstration of a High-Throughput Tensile Testing Technique Using Femtosecond Laser-Fabricated Tensile Bars in AISI 316 and Additively Manufactured Grade 91 Steel

Harvey

Torrez

Lam

et al. 2021

JOM

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hardness and modulus measurements were computed using the Oliver-Pharr method, assuming a Poisson ratio of 0.3 [37]. For microtensile testing, small scale tensile specimens were fabricated using a femtosecond laser cutting system and procedure described in previous studies [38][39][40]. Tensile specimens were cut using an output pulse width of 350 fs, wavelength of 1053 nm, repetition rate of 20 kHz, and energy of 10 µJ focused through a 5x objective.…”

Section: Methodsmentioning

confidence: 99%

Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining

et al. 2021

Self Cite

View full text Add to dashboard Cite

Beyond the current commercial materials, refining the grain size is among the proposed strategies to manufacture resilient materials for industrial applications demanding high resistance to severe environments. Here, large strain machining (LSM) was used to manufacture nanostructured HT-9 steel with enhanced thermal stability, mechanical properties, and ductility. Nanocrystalline HT-9 steels with different aspect rations are achieved. In-situ transmission electron microscopy annealing experiments demonstrated that the nanocrystalline grains have excellent thermal stability up to 700 °C with no additional elemental segregation on the grain boundaries other than the initial carbides, attributing the thermal stability of the LSM materials to the low dislocation densities and strains in the final microstructure. Nano-indentation and micro-tensile testing performed on the LSM material pre- and post-annealing demonstrated the possibility of tuning the material’s strength and ductility. The results expound on the possibility of manufacturing controlled nanocrystalline materials via a scalable and cost-effective method, albeit with additional fundamental understanding of the resultant morphology dependence on the LSM conditions.

show abstract

High‐Temperature Mechanical Behavior of Single‐Crystal FeCrAl Alloy Under In Situ Micropillar Compression

Sun,

Niu,

Shang

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

FeCrAl cladding is one of the candidate materials for the near‐term accident‐tolerant fuel technologies under development. Research on high‐temperature mechanical behaviors of single‐crystal FeCrAl alloy is rather limited. Previous studies have reported the mechanical property of low‐index orientation in single‐crystal FeCrAl alloy at room temperature. However, the critical resolved shear stress to activate slip systems can be orientation and temperature dependent. Here, single‐crystal grains in a coarse‐grained FeCrAl alloy with different crystallographic orientations are selected to preferentially activate {110}<111> slip systems or {112}<111> slip systems. Micropillars are fabricated in the selected single‐crystal grains and tested at elevated temperatures in situ in a scanning electron microscope. The critical resolved shear stresses of {110}<111> slip systems and {112}<111> slip systems are determined at various temperatures. The critical resolved shear stress shows a temperature dependence and orientation independence. This study provides important insight for understanding the deformation mechanisms of FeCrAl alloys at elevated temperatures.

show abstract

Sizing up mechanical testing: Comparison of microscale and mesoscale mechanical testing techniques on a FeCrAl welded tube

Abstract: Abstract

Cited by 10 publications

References 60 publications

Demonstration of a High-Throughput Tensile Testing Technique Using Femtosecond Laser-Fabricated Tensile Bars in AISI 316 and Additively Manufactured Grade 91 Steel

Demonstration of a High-Throughput Tensile Testing Technique Using Femtosecond Laser-Fabricated Tensile Bars in AISI 316 and Additively Manufactured Grade 91 Steel

Stable, Ductile and Strong Ultrafine HT-9 Steels via Large Strain Machining

High‐Temperature Mechanical Behavior of Single‐Crystal FeCrAl Alloy Under In Situ Micropillar Compression

Contact Info

Product

Resources

About