Use of the small punch test for the estimation of ductile-to-brittle transition temperature shift of irradiated steels

Altstadt, E.; Bergner, F.; Houška, M.

doi:10.1016/j.nme.2021.100918

Cited by 12 publications

(6 citation statements)

References 55 publications

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“…where R is the lower hole radius, and ν is the Poisson ratio. Equation (7) shows that the yield strength is proportional to the yield load, which is also the basis of previous empirical correlation analyses. Based on Equations ( 6) and ( 7), F y-i /t 0 2 was used to calculate the yield strength.…”

Section: Yield Strength Estimation Based On the First Inflection Pointmentioning

confidence: 77%

“…The diameter of circular specimens or the side length of square specimens utilized is generally not greater than 10 mm [5]. Meanwhile, the feasibility of small punch analysis has been demonstrated in different temperature environments to obtain creep and low temperature strengths [6,7]. Due to this advantage, how to estimate material properties using the small punch test with small specimen volumes instead of traditional tests has attracted more and more attention.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Tensile Properties of Inconel 625 Using Small Punch Test

Li,

Shi,

Zhang

et al. 2024

Metals

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As a commonly used material in the petrochemical, nuclear and aerospace fields, Inconel 625 has excellent strength and corrosion resistance. The accurate evaluation of material properties with small specimen volume is of great significance to ensure in-service equipment safety. To realize reasonable estimations of tensile strength based on the small punch test, load–displacement and slope–displacement curves of Inconel 625 were discussed in this study. The results prove that the first inflexion point can be used in the yield strength analysis based on the empirical correlation method and plate bend theory. Meanwhile, the lowest point of the elastic and plastic deformation stages in the slope–displacement curves were compared. A new deformation energy method was established to realize yield strength estimations. To analyze the ultimate tensile strength, a small punch deformation feature was discussed based on the geometric deformation model and microstructure analysis. The relationship between stress and displacement was obtained. Fm/dmt0 was proven to be a more appropriate parameter in ultimate tensile strength estimations.

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Section: Yield Strength Estimation Based On the First Inflection Pointmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Investigation on the Tensile Properties of Inconel 625 Using Small Punch Test

Li,

Shi,

Zhang

et al. 2024

Metals

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show abstract

“…The load-displacement curves of the materials were obtained using a small round specimen (Φ10 mm × 0.5 mm), which was punched at a constant loading rate (0.2~0.5 mm/min) [37][38][39]. After decades of development, SPT testing results can be associated with several mechanical properties of materials, such as yield strength and tensile strength [40,41], ductile-to-brittle transition temperature [42], fracture toughness [43], creep strength [44] and life prediction [45], etc., playing a positive auxiliary role in the aspects of material mechanical property testing, structural integrity assessment and damage fracture control.…”

Section: Description Of Small Punch Testmentioning

confidence: 99%

Review of Characterization on Hydrogen Embrittlement by Micro-Sample Testing Methods

Tao,

Zhou,

Miao

et al. 2023

Metals

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Conventional-sized specimens have been well and widely applied in research on hydrogen embrittlement. However, when the limited-size core components (nozzles and valves, etc.) of hydrogen energy equipment are evaluated for service damage, traditional testing with conventional-sized samples is no longer applicable and micro-sample testing methods are required. In this paper, recent progress in the characterization of hydrogen embrittlement achieved via a small-sized sample tensile test, small punch test and nanoindentation test is reviewed. The commonly used geometries and dimensions of various small-sized specimens are first described and the in situ hydrogen-containing environment testing cases equipped with small-sized specimens are presented, proving the advantages of direct observations of hydrogen influences on the mechanical property and microstructure evolution. Then, the quantitative analysis of hydrogen embrittlement sensitivity involving a small punch test is discussed, with a focus on the comparisons of the hydrogen embrittlement index calculated using different definition methods. Finally, the nanoindentation test of investigation on the interaction between hydrogen and dislocation in metals and the effect of indentation strain rate are summarized. Furthermore, the specific research directions and applications of micro-size specimens for further investigation on hydrogen embrittlement are identified.

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“…Finally, guidelines for MCT usage will be developed within WP5 in the final stage of the project. In addition to MCT testing, some project partners will provide in-kind contributions related to miniaturized specimen testing techniques, such as small punch tests [32]. At the date of this paper's writing, the unirradiated specimen preparation task is being finalized, and the first series of specimens have been tested in accordance with MC standards.…”

Section: Fractesus -Miniaturization In Fracture Toughness Testing In ...mentioning

confidence: 99%

Increase of nuclear installations safety by better understanding of materials performance and new testing techniques development (MEACTOS, INCEFA-SCALE, and FRACTESUS H2020 projects)

Brynk

Lopez

McLennan

2022

EPJ Nuclear Sci. Technol.

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Research to better understand the phenomena influencing materials and components’ performance is important for increasing the safety of Generation II and III nuclear plants. A crucial step for improving nuclear safety is the development of new experimental techniques that can provide the necessary data. The three H2020 projects presented in this paper, MEACTOS (2017–2022), INCEFA-SCALE (2020–2025), and FRACTESUS (2020–2024), cover the steps needed to realize those safety improvements. The goal of the MEACTOS project is to improve the resistance of critical locations, including welds, to environmentally-assisted cracking through optimizing surface machining and treatments. The project is currently in its final stage, and the complete analysis of the data is finished. The objective of INCEFA-SCALE is to improve predictions of component fatigue lifetime when subjected to Environmentally-Assisted Fatigue (EAF). The strategy consists of producing guidance on how to appropriately accommodate variable amplitude and plant-relevant loading in EAF assessments. Increasing the understanding of the EAF mechanism based on substantial testing, characterization, and analysis program will support the INCEFA-SCALE strategy. The FRACTESUS project will validate the use of miniaturized compact tension specimens by comparing the results of master curve-oriented fracture toughness tests performed with small and large specimens. The round-robin exercises will use irradiated and non-irradiated Reactor Pressure Vessel (RPV) materials. The material selection process is complete in time for the project to enter the testing phase. The output of the project will be beneficial from a long-term operation perspective and a saving in the material amount needed for RPV surveillance programs. Even though each project is devoted to different research areas, common aspects are clearly visible. All three projects investigate phenomena that are relevant to the performance and safe operation of the nuclear plant. Moreover, each project will provide valuable databases and analyses of test results for materials relevant to components in the nuclear plant. The output of these projects will be of great value to the nuclear industry. This paper presents the current progress for each project, emphasizing the common research domains between the projects.

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Use of the small punch test for the estimation of ductile-to-brittle transition temperature shift of irradiated steels

Cited by 12 publications

References 55 publications

Investigation on the Tensile Properties of Inconel 625 Using Small Punch Test

Investigation on the Tensile Properties of Inconel 625 Using Small Punch Test

Review of Characterization on Hydrogen Embrittlement by Micro-Sample Testing Methods

Increase of nuclear installations safety by better understanding of materials performance and new testing techniques development (MEACTOS, INCEFA-SCALE, and FRACTESUS H2020 projects)

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