Hochtemperatur-Plastizität

Ilschner, Bernhard

doi:10.1007/978-3-642-80708-4

Cited by 123 publications

(35 citation statements)

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“…Critical high temperature components such as first stage blades for gas turbines or steam headers for fossil fired power plants operate under creep conditions where they have to withstand mechanical stresses at temperatures where diffusion processes are important [1,2]. In the creep regime there is no critical stress, like the room temperature yield stress, below which no deformation occurs.…”

Section: Introductionmentioning

confidence: 99%

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High temperature test rig for inert atmosphere miniature specimen creep testing

Peter

Otto

Depka

et al. 2011

Materialwissenschaft Werkst

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A creep test rig is described which allows to perform creep experiments with miniature tensile creep specimens under an inert gas atmosphere at temperatures up to 1150 8C. Previous work on the development of a miniature tensile creep test procedure is described. The key elements of the new inert gas system are then described. The test rig yields reliable creep data. Three examples for applications of the new system addressing grain boundary sliding in a TiAl alloy, creep cavitation and damage accumulation in copper and to provide high temperature creep data for a Co-Re-Cr alloy are given.

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Section: Introductionmentioning

confidence: 99%

“…2a shows the dimensions of our flat miniature creep specimen. The miniature creep sample is of the dog-bone-type with a total length of 22 mm, a gauge length of 9 mm, and a cross-section of 263 mm 2 . Fig.…”

Section: Introductionmentioning

confidence: 99%

High temperature test rig for inert atmosphere miniature specimen creep testing

Peter

Otto

Depka

et al. 2011

Materialwissenschaft Werkst

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“…Further studies and investigations will cover following topics:  Accurate evaluation of the effect of hardening due to cold work on the creep behavior [1]  Description of the stability of residual stresses due to the combined thermal and cyclically mechanical load  Calculation of different surface conditions (Shot peened, Low Stress Grinded)  Identification of local creep behavior including primary creep…”

Section: Discussionmentioning

confidence: 99%

“…The crucial part for the stability of residual stress due to thermal loads is the compressive residual stress, which is higher than the tensile part. The increased level of dislocation in the surface layer through cold working leads to a shift of the starting point along the creep curve [1]. This means that creep won't occur until the initial amount of dislocations due to cold working is reached ( Figure 5).…”

Section: Analysis and Simulationmentioning

confidence: 99%

Thermal Stability of Residual Stresses in Ti-6Al-4V components

Stanojević

Angerer

Oberwinkler

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The need for light weight design while maintaining a high safety is essential for many components, especially in the aircraft industry. Therefore, it's important to consider every aspect to reduce weight, improve fatigue life and maintain safety of crucial components. Residual stresses are a major factor which can positively influence components and fulfil all three requirements. However, due to the inconstancy of the behaviour of residual stresses during the life time of a component, residual stresses are often neglected. If the behaviour of residual stresses could be described reliably over the entire life time of a component, residual stresses could be taken into account and components could be optimized even further. Mechanical and thermal loads are the main reason for relaxation of residual stresses. This work covers the thermal stability of residual stresses in Ti-6Al-4V components. Therefore, exposure tests at raised temperatures were performed on specimens with different surface conditions. Residual stresses were measured by x-ray diffraction before and after testing. Creep tests were also carried out to describe the creep behaviour and thereby the ability for residual stress relaxation. A correlation between the creep rate and amount of relaxed stress was found. The creep behaviour of the material was described by using a combination of the Norton Power law and the Arrhenius equation. The Zener-Wert-Avrami model was used to describe the residual stress relaxation. With these models a satisfying correlation between measured and calculated data was found. Hence, the relaxation of residual stresses due to thermal load was described reliably.

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“…For a range of temperatures and stress levels an important deformation regime is the dislocation creep. Here the deformation is controlled by the movement of mobile dislocations (Illschner 1973;Blum 2001;Frost and Ashby 1982). The creep rate is related to the velocity of mobile dislocations.…”

Section: Creep and Relaxationmentioning

confidence: 98%

Analysis of Inelastic Behavior for High Temperature Materials and Structures

Naumenko

Altenbach

2015

Advanced Structured Materials

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This review provides a current status in modeling and analysis of structures for high-temperature applications. Basic features of inelastic behavior of heat resistant alloys are discussed. Typical responses for stationary and varying loading and temperature are presented and classified. Microstructural features and microstructural changes in the course of inelastic deformation at high temperature are discussed. The state of the art on material modeling and structural analysis in the inelastic range at high temperature is resented.Keywords Creep · Low cycle fatigue · Damage mechanics · Length scales · Temporal scales · Structural analysis IntroductionThe aim of this contribution is to give an overview of experimental and theoretical approaches to analyze the behavior of materials and structures subjected to mechanical loading and "high-temperature" environment. The definition of "hightemperature" materials and "high-temperature" structures can be related to the value of the homologous temperature, that is T /T m , where T is the absolute temperature and T m is the melting point of the considered material. Materials that can be efficiently used within the temperature range 0.3 < T /T m < 0.7 are called hightemperature materials. Examples include heat resistant steels, nickel-bases alloys, age-hardened aluminum alloys, cast iron materials and metal matrix composites. Structures that operate in the temperature range 0.3 < T /T m < 0.7 over a long period of time are called high-temperature structures. Examples include turbine

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Hochtemperatur-Plastizität

Cited by 123 publications

References 0 publications

High temperature test rig for inert atmosphere miniature specimen creep testing

High temperature test rig for inert atmosphere miniature specimen creep testing

Thermal Stability of Residual Stresses in Ti-6Al-4V components

Analysis of Inelastic Behavior for High Temperature Materials and Structures

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