Formation of low angle boundaries in Ni-based superalloys

D’Souza, N.; Newell, M.; Devendra, Kumar; Jennings, Paul; Ardakani, M.G.; Shollock, Barbara A.

doi:10.1016/j.msea.2005.08.188

Cited by 64 publications

(37 citation statements)

References 6 publications

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“…The small difference in dendrite growth orientation stems from the geometrical shape of liquid melt pool formed during LSM. Formation of low‐angle grain boundaries is also commonly observed in Ni‐base super alloy cast structures under slow cooling rates …”

Section: Discussionmentioning

confidence: 90%

“…Formation of low-angle grain boundaries is also commonly observed in Ni-base super alloy cast structures under slow cooling rates. 35,36 The greater cell proliferation on LSM samples compared to untreated 316L stainless steel can be attributable to (i) surface roughness (in as-processed condition) and (ii) crystallographic texture (in polished and as-processed condition). At day 3 in as-processed condition, 200% higher optical density observed on LSM at 1 mm/s is because of combined effect of surface roughness and preferred grain orientation.…”

Section: Discussionmentioning

confidence: 99%

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Laser surface modification of 316L stainless steel

et al. 2017

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Medical grade 316L stainless steel was laser surface melted (LSM) using continuous wave Nd-YAG laser in argon atmosphere at 1 and 5 mm/s. The treated surfaces were characterized using electron backscatter diffraction to study the influence of top surface crystallographic orientation and type of grain boundaries on corrosion resistance, wettability, and biocompatibility. The laser scan velocity was found to have a marginal influence on the surface roughness and the type of grain boundaries. However, the crystal orientation density was found to be relatively high in 1 mm/s samples. The LSM samples showed a higher concentration of {101} and {123} planes parallel to the sample surface as well as a higher fraction of low-angle grain boundaries. The LSM samples were found to exhibit better surface wettability and enhanced the viability and proliferation of human fetal osteoblast cells in vitro when compared to the untreated samples. Further, the corrosion protection efficiency of 316L stainless steel was improved up to 70% by LSM in as-processed condition. The increased concentration of {101} and {123} planes on surfaces of LSM samples increases their surface energy, which is believed to be responsible for the improved in vitro cell proliferation. Further, the increased lattice spacing of these planes and high concentration of low-energy grain boundaries in LSM samples would have contributed to the better in vitro corrosion resistance than untreated 316L stainless steel. Our results indicate that LSM can be a potential treatment option for 316L stainless steel-based biomedical devices to improve biocompatibility and corrosion resistance. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 569-577, 2018.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Laser surface modification of 316L stainless steel

et al. 2017

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“…High angle boundaries (HAB) and low angle boundaries (LAB) are formed in directionally solidified and SC castings as a result of incorrect direction of heat transfer during solidification, mold impurities, and too low temperature gradient [60]. Contact between dendrites of different orientation relating to the direction of casting solidification causes the formation of high or low angle grain boundaries.…”

Section: Macro and Microstructure Investigationmentioning

confidence: 99%

The Unidirectional Crystallization of Metals and Alloys (Turbine Blades)

Kubiak

Szeliga

Sieniawski

et al. 2015

Handbook of Crystal Growth

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“…[19] These observations are further supported by the research of D'Souza and co-workers, who found evidence of cumulative misorientations along castings of CMSX-4 and identified that this was a result of plastic deformation in the mush. [20][21][22] Similarly, a study of the origins of sliver defects identified that they arise through mushy zone deformation as a result of differential thermal contraction between metal and mold. [23] As such studies have highlighted the importance of deformation behavior in the semi-solid state, it is clearly highly desirable to have direct evidence of the transient phenomena that give rise to the formation of these macroscopic casting defects.…”

Section: Introductionmentioning

confidence: 99%

On the Deformation of Dendrites During Directional Solidification of a Nickel-Based Superalloy

Aveson

Reinhart

Goddard

et al. 2019

Metall Mater Trans A

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Synchrotron X-ray imaging has been used to examine in situ the deformation of dendrites that takes place during the solidification of a nickel-based superalloy. By combining absorption and diffraction contrast imaging, deformation events could be classified by their localization and permanence. In particular, a deformation mechanism arising from thermal contraction in a temperature gradient was elucidated through digital image correlation. It was concluded that this mechanism may explain the small misorientations typically observed in single crystal castings.

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Formation of low angle boundaries in Ni-based superalloys

Cited by 64 publications

References 6 publications

Laser surface modification of 316L stainless steel

Laser surface modification of 316L stainless steel

The Unidirectional Crystallization of Metals and Alloys (Turbine Blades)

On the Deformation of Dendrites During Directional Solidification of a Nickel-Based Superalloy

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