Nondestructive characterization of materials A growing demand for describing damage and service-life-relevant aging processes in plant components

Dobmann, Gerd; Meyendorf, Norbert; Schneider, E.

doi:10.1016/s0029-5493(96)01319-2

Cited by 45 publications

(28 citation statements)

References 4 publications

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“…To operate plants safely past their design life, an NDE technique that enables the evaluation of the current state of materials and predicts their remaining life, has long been sought. [4][5][6][7] At present, surface replication, boat samples, and miniature test coupons are used to assess the creep damage after years of service. [1,[8][9][10][11] While somewhat successful, such tests are limited by restrictions associated with the considerable pretest knowledge required to determine the proper location for testing.…”

Section: Introductionmentioning

confidence: 99%

Creep-Induced Microstructural Evolution and Acoustic Characterization in Tempered Martensitic Stainless Steel

Ohtani

2007

Metall Mater Trans A

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The microstructural evolution of a tempered martensitic stainless steel (a 12 pct chromium steel, type-403), during creep test, subjected to a tensile creep test at 873 K, was studied by monitoring the shear-wave attenuation and velocity using electromagnetic acoustic resonance (EMAR). The study disclosed an attenuation peak at around 20 to 30 pct of the creep life, and a minimum value at 50 pct of the creep life, and a local minimum velocity at the attenuation peak, independent of the applied stress. These novel phenomena are interpreted as a result of microstructural changes, especially dislocation recovery. This interpretation is supported by transmission electron microscopy observations of the dislocation structure. The relationship between the changes in attenuation, velocity, and microstructure evolution can be explained with the string model. The study results have suggested that EMAR possesses the potential to assess the progress of creep damage and to predict the remaining creep life of metals.

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Section: Introductionmentioning

confidence: 99%

Creep-Induced Microstructural Evolution and Acoustic Characterization in Tempered Martensitic Stainless Steel

Ohtani

2007

Metall Mater Trans A

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“…[1,2] For this assessment, a nondestructive technology enabling the evaluation of the current state of the materials and the prediction of their remaining life has long been sought after. [3][4][5][6][7][8][9][10][11] Some candidates include magnetic, replication, small angle neutron scattering (SANS), and ultrasonic methods. [6] The magnetic and replication methods have been applied in the past.…”

Section: Introductionmentioning

confidence: 99%

Acoustic damping characterization and microstructure evolution during high-temperature creep of an austenitic stainless steel

Ohtani

2005

Metall Mater Trans A

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We studied the microstructure evolution of an austenitic stainless steel, Type 316L, subjected to tensile creep at 973 K through the monitoring of shear-wave attenuation and velocity using electromagnetic acoustic resonance (EMAR). Contactless transduction based on the Lorentz force mechanism is the key to establishing a monitor for microstructural change in the bulk of metals with high sensitivity. In the short interval, 60 to 70 pct of the creep life, attenuation experiences a peak, independent of the applied stress. A drastic change in dislocation mobility and rearrangement interrupted this novel phenomenon, as is supported by observations using a scanning electron microscope (SEM) and a transmission electron microscope (TEM). The EMAR exhibited the potential for the assessment of damage advance and the prediction of the remaining creep life of metals.

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“…Such technique is highly desirable for testing engineering and structural materials. In fact, most of the current nondestructive techniques are limited by either small penetration depth or low sensitivity [22,23]. Furthermore, the use of small accelerators or neutron generators eliminates the hassle and the safety issues associated with the use of radioactive sources, which is one of the reasons that hinders positron applications in industry.…”

Section: Advantages and Limitations Of γ-Induced Pasmentioning

confidence: 99%

Gamma Induced Positron Annihilation: History, Current, and Future Developments

Selim

2017

Acta Phys. Pol. A

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Positron annihilation spectroscopy is often performed using radioactive sources for bulk measurements or positron beams for depth resolved measurements. Both have many advantages and great capabilities for a variety of applications. In the recent history, we have shown that positron annihilation spectroscopy can be carried out directly using high energy photons without the need for positron source or positron beam. This approach brings unique capabilities for some specific applications and promotes the use of positron annihilation spectroscopy in new areas of materials science and probably in industrial applications. Some of the important applications include developing new nondestructive highly penetrating sensitive probe for structural and engineering materials. It can also greatly advance positron applications in bulk semiconductors, electronic and photonic materials as well as in polymers, ceramics, and liquids. The recently developed γ-induced positron spectroscopy in HZDR in Dresden provides an example of an excellent facility for many of these applications. When incorporated with pulsed accelerators, γ-induced positron annihilation spectroscopy may trigger novel studies of transient states in matter and explore several solid-state processes that take place on short time scale. In this article I will review the history and development of the technique and its incorporation in a wide range of accelerators including table top electron accelerators, pulsed electron accelerators, and Van de Graaff accelerators. Then I will introduce a design for a new γ-induced positron annihilation spectroscopy facility based on using small nuclear research reactors or neutron generators. The paper presents all the possible approaches for γ-induced positron annihilation spectroscopy and discusses its potential and limitations to guide the efforts in further development of the technique and illustrate the unique aspects that the technique can bring to positron science and applications.

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Nondestructive characterization of materials A growing demand for describing damage and service-life-relevant aging processes in plant components

Cited by 45 publications

References 4 publications

Creep-Induced Microstructural Evolution and Acoustic Characterization in Tempered Martensitic Stainless Steel

Creep-Induced Microstructural Evolution and Acoustic Characterization in Tempered Martensitic Stainless Steel

Acoustic damping characterization and microstructure evolution during high-temperature creep of an austenitic stainless steel

Gamma Induced Positron Annihilation: History, Current, and Future Developments

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