Solute induced hardening near grain boundaries in zone refined metals

Aust, K.T.; Hanneman, R. E.; Niessen, P.; Westbrook, J. H.

doi:10.1016/0001-6160(68)90014-x

Cited by 228 publications

(75 citation statements)

References 14 publications

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“…In these and other experiments in literature, Ngan and Chiu [5] found a Hall -Petch type dependence of the hardness on the distance to the grain boundary, from which they calculated the Hall -Petch slope k y as a measure of the resistance to slip transfer across the particular boundary. This approach is however much disputed, as further indentation measurements on grain boundaries in Ni 3 Al showed no appreciable hardening [6]. Recently, Soifer et al [7] carried out ultralow load (90 AN) nanoindentation experiments on high- In this study, we present a new method for probing the slip transmission properties of an individual grain boundary using nanoindentation.…”

Section: Introductionmentioning

confidence: 90%

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Detection of grain-boundary resistance to slip transfer using nanoindentation

Soer

Hosson

2005

Materials Letters

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Section: Introductionmentioning

confidence: 90%

“…Subgranular microhardness testing has been used for a long time to measure grain boundary hardening due to solute segregation [3], i.e. solid-solution hardening.…”

Section: Introductionmentioning

confidence: 99%

Detection of grain-boundary resistance to slip transfer using nanoindentation

Soer

Hosson

2005

Materials Letters

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“…Micro-hardness experiments indicate that segregation of solute atoms at the GBs results in either hardened or softened regions compared to the interior of the adjacent grains [11,12]. Nanoindentation has detected a significant increase in the intrinsic hardness of the material near the GBs due to dislocation pinning [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel

Yavas

Mishra

Alshehri

et al. 2018

Electrochemistry Communications

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High-strength low-alloy steels used for oil and gas pipelines are vulnerable to intergranular stress corrosion cracking in moderately alkaline soils. The mechanism of corrosion-induced embrittlement under such conditions is not yet understood. Nanoindentation was used to detect localized degradation of mechanical properties near internal grain boundaries of X-70 steel undergoing intergranular corrosion at active dissolution potentials at pH 8.2. The measurements identified a one-micron thick mechanically-degraded layer with 25% reduced hardness near corroded grain boundaries. It is suggested that the corrosion process may introduce an active softening agent, possibly non-equilibrium lattice vacancies generated by oxidation. KeywordsIntergranular corrosion, Dissolution-induced degradation, Stress corrosion cracking, Grain boundary softening, Nanoindentation Disciplines Aerodynamics and Fluid Mechanics | Aerospace Engineering | Nanoscience and Nanotechnology | Structures and Materials CommentsThis is a manuscript of an article published as Yavas, Denizhan, Pratyush Mishra, Abdullah Alshehri, Pranav Shrotriya, Kurt R. Hebert, and Ashraf F. Bastawros. "Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel." Electrochemistry Communications 88 (2018) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D MA N U S C R I P T AbstractHigh-strength low-alloy steels used for oil and gas pipelines are vulnerable to intergranular stress corrosion cracking in moderately alkaline soils. The mechanism of corrosion-induced embrittlement under such conditions is not yet understood. Nanoindentation was used to detect localized degradation of mechanical properties near internal grain boundaries of X-70 steel undergoing intergranular corrosion at active dissolution potentials at pH 8.2. The measurements identified a one-micron thick mechanicallydegraded layer with 25% reduced hardness near corroded grain boundaries. It is suggested that the corrosion process may introduce an active softening agent, possibly non-equilibrium lattice vacancies generated by oxidation.

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“…Much research work (29,64,101,102) have been done on the determination of grain boundary chemistry to interpret the intergranular embrittlement by using surface-sensitive instruments or scanning transmission electron microscopic studies. In most cases, solute enrichment at grain boundaries was restricted to .the more common impurities in iron such as P, S, N, Sn and Sb.…”

Section: B Effect Of Boron Segregationmentioning

confidence: 99%

Study of intergranular embrittlement in Fe-12Mn alloys

Lee¹

1982

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Solute induced hardening near grain boundaries in zone refined metals

Cited by 228 publications

References 14 publications

Detection of grain-boundary resistance to slip transfer using nanoindentation

Detection of grain-boundary resistance to slip transfer using nanoindentation

Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel

Study of intergranular embrittlement in Fe-12Mn alloys

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