Application of Automated Ball Indentation for Property Measurement of Degraded Zr2.5Nb

Effects of chemical composition and heat treatment on the microstructures and mechanical properties were investigated with automated ball-indentation tests, scanning and transmission electron microscopy, and energy-dispersive X-ray analysis. In this work, the automated ball-indentation (ABI) technique was compared with the standard mechanical tests. The ABI method is based on load-controlled multiple indentations into a polished surface by a spherical indenter. The indentation depth is progressively increased to the specified maximum limit with intermediate partial unloading. This technique allows us to measure the yield strength, the stress-strain curve, the strength coefficient and the strain-hardening exponent. For all the test materials and conditions, the ABI-derived results were in very good agreement with those obtained with conventional standard test methods. We analyzed the effect of heat treatment on the alloys with different chemical compositions. Heat treatment leads to changes in the mechanical properties of the alloys, which are the results of several processes. Keywords: Al-alloys, heat treatment, tensile strength, yield strength, ABI hardness test Vpliv kemijske sestave in toplotne obdelave na mikrostrukturo in mehanske lastnosti je bil preiskovan z avtomatiziranim preizkusom trdote z vtiskovanjem kroglice, z vrsti~no in presevno elektronsko mikroskopijo in energijsko disperzijsko rentgensko spektroskopijo. V tem delu je bila tehnika avtomatskega vtiskovanja kroglice (ABI) primerjana s standardnimi mehanskimi preizkusi. ABI metoda temelji na kontrolirani obte`itvi pri ve~kratnem vtiskovanju krogli~nega telesa v polirano povr{ino. Globina vtiskovanja postopoma nara{~a do maksimalne dolo~ene globine z vmesnimi razbremenitvami. Ta tehnika omogo~a merjenje meje te~enja, krivulje raztezek-obremenitev, koeficienta trdnosti in eksponenta napetostnega utrjevanja. Za vse preizku{ane materiale in pogoje, so se dobljeni ABI rezultati dobro ujemali z rezultati dobljenimi iz obi~ajnih metod preizku{anja. Preu~evan je bil vpliv toplotne obdelave na zlitine z razli~no kemijsko sestavo. Toplotna obdelava povzro~i spremembo mehanskih lastnosti zlitin, kar je posledica ve~ih procesov.

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“…4,5 As shown previously 6 , the results obtained with this method achieve good compatibility with those of the conventional methods.…”

Section: Introductionsupporting

confidence: 49%

Use of the ABI technique to measure the mechanical properties of aluminium alloys: effect of heat-treatment conditions on the mechanical properties of alloys

Trudonoshyn

Puchnin²,

Prach³

2016

Mater. Tehnol.

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“…H. K. Khandelwal et al [12] characterized the flow behavior of reactor pressure vessel steel SA 508, pressure tube material Zr-2.5Nb and other nuclear component materials using BI approach. Kamal Sharma et al [13] used numerical simulation with finite element and artificial neural network methodology to estimate the mechanical properties using BI approach. Kamal Sharma et al [14] also applied BI methodology to estimate the degradation of Zr-2.5Nb alloy.…”

Section: Ball Indentation Approachmentioning

confidence: 99%

Mechanical Property Estimation of Similar Weld using Ball Indentation Technique

Khandelwal¹,

Sharma²,

Chhibber³

2012

JMMCE

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A weld joint is composed of three principal zones viz., base metal, Heat Affected Zone (HAZ), and weld zone. Thus, the variation in mechanical behavior exists not only among these zones, but also from point to point in each individual zone. Being destructive in nature, the conventional method of mechanical testing cannot successfully used to estimate the variation in the mechanical behavior at different zones of the weld joint. Moreover, the conventional method of mechanical testing cannot characterize the material using small amount of material. In this respect, Ball Indentation (BI) methodology was considered to be useful approach, since it can characterize the mechanical properties of a material using very small amount of material in non destructive manner. The present work is an attempt to characterize the variation in the mechanical properties among each zone (global variation), and from point to point in each zone (local variation) of the similar weld joint used in nuclear application using BI approach. For this purpose, the similar weld joint of two SS-304 LN pipe lines was investigated using BI approach.

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“…Pharr et al 12 obtained the properties of a ceramic by the indentation method. Sharma et al 13 determined the tensile properties of titanium using the static indentation test. 13 Lee et al 14 and Phadikar et al 15 performed similar investigations to find mechanical properties from indentation test.…”

Section: Introductionmentioning

confidence: 99%

“…Sharma et al 13 determined the tensile properties of titanium using the static indentation test. 13 Lee et al 14 and Phadikar et al 15 performed similar investigations to find mechanical properties from indentation test. Chikot et al 16 found the strain-hardening exponent using static indentation method.…”

Section: Introductionmentioning

confidence: 99%

Determination of stress–strain curves of materials at high strain rates using dynamic indentation technique

Pourolajal

Majzoobi

2020

The Journal of Strain Analysis for Engineering Design

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Determination of dynamic behaviour of materials is a serious challenge in mechanics of materials. In this investigation, a new approach is proposed to obtain stress–strain curves of metals from dynamic indentation test. This approach is based on a combined experiment, simulation, and optimization techniques. In the experiment side, a conical penetrator is shot against the material as the target. The load–indentation depth curve is obtained from the dynamic indentation test. The indentation test is simulated using Ls-dyna and the numerical load–indentation depth is obtained from the simulation. The stress–strain curves are defined by Johnson–Cook material model. From optimization of the difference between the experimental and numerical load–indentation depth curves, the constants of the material model are identified. The material model is validated also by stress–strain curves obtained from quasi-static test conducted using Instron and dynamic tests conducted using Split Hopkinson Bar. The results show a close agreement between the model prediction and the experimental stress–strain curves for different strain rates.

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Application of Automated Ball Indentation for Property Measurement of Degraded Zr2.5Nb

Cited by 11 publications

References 6 publications

Use of the ABI technique to measure the mechanical properties of aluminium alloys: effect of heat-treatment conditions on the mechanical properties of alloys

Use of the ABI technique to measure the mechanical properties of aluminium alloys: effect of heat-treatment conditions on the mechanical properties of alloys

Mechanical Property Estimation of Similar Weld using Ball Indentation Technique

Determination of stress–strain curves of materials at high strain rates using dynamic indentation technique

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