Mechanical properties of Zr–2.5%Nb pressure tube material subjected to heat treatments in α+β phase field

Kulkarni, R.V.; Krishna, K.V. Mani; Neogy, S.; Srivastava, D.; Ramadasan, E.; Shriwastaw, R.S.; Rath, B.N.; Saibaba, N.; Jha, S.K.; Dey, G.K.

doi:10.1016/j.jnucmat.2014.04.005

Cited by 17 publications

(4 citation statements)

References 33 publications

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“…The corrosion and mechanical performance of Zr alloys is intrinsically related to the nature, morphology and behaviour of second phases and the underlying microstructure [1][2][3][4][5][6][7][8][9]. It is therefore essential to characterise second phases with clarity and consistency in order to accurately assess their evolving behaviour during the lifetime of nuclear components.…”

Section: Introductionmentioning

confidence: 99%

The characterisation of second phases in the Zr-Nb and Zr-Nb-Sn-Fe alloys: A critical review

Harte

Griffiths

Preuss

2018

Journal of Nuclear Materials

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The nature and evolution of the Fe environment in Zr-Nb and Zr-Nb-Sn-Fe systems is essential to alloy performance during corrosion, hardening and irradiation-induced growth. Unfortunately, there is ambiguity in the literature regarding the characterisation of secondary phases in these systems. The presence, or not, of Fe in β-Nb phase has been a source of disagreement. In ternary ZrNbFe intermetallics, identical compositions have been designated as Zr(Nb,Fe)2 or (Zr,Nb)3Fe. We show that while Zr(Nb,Fe)2 is commonly reported, it is not always justified. The cubic phase (Zr,Nb)2Fe is easily identified, but its composition is more variable after low temperature heat treatments. We demonstrate the need for correlative approaches in the assessment of phase composition, crystallography and local Fe environment under different heat treatment regimes. Irradiation effects allow us to draw clues regarding phase designation, but there is diverse behaviour under irradiation due to initial phase composition, irradiation dose rate and temperature.

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Section: Introductionmentioning

confidence: 99%

The characterisation of second phases in the Zr-Nb and Zr-Nb-Sn-Fe alloys: A critical review

Harte

Griffiths

Preuss

2018

Journal of Nuclear Materials

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“…ABI is suitable for finding coefficients of a power law hardening material model, by calculating a stress-strain curve from the indentation diameter, the indenter diameter, applied load and a correlation parameter, which is found iteratively. The strain Puchnin et al 109 and Patil et al 112 Ammar et al 108 and Wang et al 110 Kulkarni et al 114 Bespoke specimens Knitel et al 181 Kazakeviciute et al 188 hardening exponent can be found to within 2% of the actual value. 101 There was a linear correlation between small punch strain hardening index (calculated from maximum load and limit load) and tensile test strain hardening index, which allowed to convert one into another.…”

Section: Plastic Behaviourmentioning

confidence: 90%

Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Kazakeviciute

Rouse

Focatiis

et al. 2021

The Journal of Strain Analysis for Engineering Design

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Small specimen mechanical testing is an exciting and rapidly developing field in which fundamental deformation behaviours can be observed from experiments performed on comparatively small amounts of material. These methods are particularly useful when there is limited source material to facilitate a sufficient number of standard specimen tests, if any at all. Such situations include the development of new materials or when performing routine maintenance/inspection studies of in-service components, requiring that material conditions are updated with service exposure. The potentially more challenging loading conditions and complex stress states experienced by small specimens, in comparison with standard specimen geometries, has led to a tendency for these methods to be used in ranking studies rather than for fundamental material parameter determination. Classifying a specimen as ‘small’ can be subjective, and in the present work the focus is to review testing methods that utilise specimens with characteristic dimensions of less than 50 mm. By doing this, observations made here will be relevant to industrial service monitoring problems, wherein small samples of material are extracted and tested from operational components in such a way that structural integrity is not compromised. Whilst recently the majority of small specimen test techniques development have focused on the determination of creep behaviour/properties as well as sub-size tensile testing, attention is given here to small specimen testing methods for determining specific tensile, fatigue, fracture and crack growth properties. These areas are currently underrepresented in published reviews. The suitability of specimens and methods is discussed here, along with associated advantages and disadvantages.

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“…Following the quenching rate, sampling positions of ASTM A255 and ISO 642, SPT specimens could be used to explore the mechanical properties generated by three tempering conditions for at least 22 quenching rates with a single Jominy bar. Despite some works that studied the effect of the cooling rate on mechanical properties by employing the SPT, including research on the heat affected zones (HAZs) on thermal cutting and welds [20,25] and on pressure tubes combining dilatometry and the SPT [26], we have not found any instances in the literature regarding the combination of the Jominy test and SPT for the same purposes.…”

Section: Introductionmentioning

confidence: 92%

Small Punch Test on Jominy Bars for High-Throughput Characterization of Quenched and Tempered Steel

Miguel,

Berriozabalgoitia,

Artola

et al. 2023

Metals

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Studying the effect of quench and tempering heat treatments on steel, more specifically screening the effect of the austenitizing, quenching, and tempering conditions on mechanical properties, can be extremely material- and time-consuming when standard tensile testing specimens are employed. Jominy bar end quench testing has been used as a standard method to reduce the resources that are required for this type of screening. Jominy bar testing by itself shows, though, the limitation of yielding only hardness and microstructure as a result. In the last few years, the small punch test (SPT) standard has been developed. This technique can obtain an estimation of tensile mechanical properties with miniaturized specimens, which can be dissected from Jominy bars. The paper proposes a new testing methodology for screening the outcome of heat treatment conditions by combining the Jominy bar testing and SPT. Quench and tempering of API 5L X65Q pipe steel is used as a case study to describe the proposed methodology. The ability of the Jominy with SPT to detect variations in the mechanical properties produced by heat treatments is shown. This methodology can be directly applied as a high-throughput testing approach in the optimization of heat treatments.

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Mechanical properties of Zr–2.5%Nb pressure tube material subjected to heat treatments in α+β phase field

Cited by 17 publications

References 33 publications

The characterisation of second phases in the Zr-Nb and Zr-Nb-Sn-Fe alloys: A critical review

The characterisation of second phases in the Zr-Nb and Zr-Nb-Sn-Fe alloys: A critical review

Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Small Punch Test on Jominy Bars for High-Throughput Characterization of Quenched and Tempered Steel

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