High-temperature behaviour of IN 738 LC under isothermal and thermo-mechanical cyclic loading

Frenz, Horst; Meersmann, J.; Ziebs, J.; Kühn, Hans-Joachim; Sievert, R.; Olschewski, J.

doi:10.1016/s0921-5093(97)00025-7

Cited by 15 publications

(4 citation statements)

References 10 publications

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“…[19][20][21][22][23][24][25][26] Most conventional titanium alloys do not have a temperature potential high enough, so that TMF loading was of no concern earlier. In contrast, since IMI 834 is intended for service temperatures up to 600 ЊC, damage caused by TMF significantly affects fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical fatigue behavior of the high-temperature titanium alloy IMI 834

Pototzky

Maier

Christ

1998

Metall Mater Trans A

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The isothermal and thermomechanical fatigue (TMF) behavior of the titanium alloy IMI 834 was studied between 350 ЊC and 650 ЊC in air and vacuum, respectively. Transmission electron microscopy (TEM) observations revealed that the microstructure established in the TMF tests was governed by the maximum temperature within the cycle. However, if the maximum temperature does not exceed 600 ЊC, planar dislocation slip prevails and similar microstructures are formed regardless of the test temperature and the testing mode (TMF and isothermal, respectively). As a result, the stressstrain response in TMF tests can be assessed from the corresponding isothermal data. Wavy dislocation slip was found to determine the stress-strain behavior if the maximum test temperature exceeded 600 ЊC. Moreover, in TMF tests with a maximum test temperature of 650 ЊC, the dislocation arrangement formed in the high-temperature part of the hysteresis loop was found to be stable throughout the cycle and to affect significantly the stress-strain response at the low temperatures. Although in-phase (IP) and out-of-phase (OP) TMF tests led to an almost identical microstructure, OP loading was always found to be most detrimental. The interaction between the embrittled subsurface layer, caused by oxygen uptake, and the high tensile stresses developing in the low-temperature part of the hysteresis loop in OP tests eases crack initiation and initial crack propagation and results in reduced fatigue life.

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Section: Introductionmentioning

confidence: 99%

Thermomechanical fatigue behavior of the high-temperature titanium alloy IMI 834

Pototzky

Maier

Christ

1998

Metall Mater Trans A

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“…The isotropic hardening effect can represent the expansion-contraction evolution of the yield surface by isotropic internal stress. According to Frenz, 37 Benallal and Cheikh 38 proposed a state function of internal stress R with equivalent plastic strain p and temperature to describe the deformation and temperature dependence. Therefore, the evolution equation of R is expressed as follows:…”

Section: Thermal Cyclic Plastic Simulation Of Cylinder Head Scaled Sp...mentioning

confidence: 99%

Experimental and numerical studies of thermal-structural behavior based on cast iron scaled cylinder head specimen

Zhang

Liang

Qiao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In order to clarify the thermal deformation and failure mechanism of the nodular cast iron cylinder head of marine diesel engines during long-term service, a high-efficiency thermal cycling experiment was conducted on scaled cylinder head specimen based on the similarity principle, and the thermal cycling load was simulated by flame heating and water spray cooling method. Then the Chaboche combined hardening model considering temperature and cumulative effect was established. The cyclic plastic behavior of the scaled specimen model during non-uniform thermal cycling was verified from transient temperature, cumulative out-of-round deformation and crack failure. Subsequently, the law of cyclic plastic deformation of specimens under thermal cycling was studied. The results showed that with the increase of the cycle number, the plastic strain of the valve bridge region of the scaled specimens accumulated gradually, showing a large amount of permanent strain of the circular hole within a maximum of 20.3 μm out-of-round deformation. The difference between the calculated and tested deformation is 1.9 μm (10.5%), which shows the excellent predictability of the numerical model. The research findings are valuable for predicting and evaluating the thermal-structural behavior of the prototype cylinder head.

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“…(10) and (12), the nonproportional factor will correspond with the amount of additional hardening under nonproportional loading. To examine the relationship between the nonproportional factor and the additional hardening, the stress range calculated by the following equation is compared with the experimental stress range.…”

Section: Correlation Of Lcf Fatigue Lives With Nonproportional Strainmentioning

confidence: 99%

“…Many studies have been performed for assessing high temperature nonproportional low cycle fatigue damage [1][2][3][4][5][6][7][8][9][10][11][12][13] and the equivalent strain defined in ASME Code Case (ASME strain) [14] is a typical parameter for nonproportional life assessment. However, the ASME strain has been reported to underestimate the fatigue lives in some nonproportional strain histories [3,15].…”

Section: Introductionmentioning

confidence: 99%

High temperature nonproportional low cycle fatigue using fifteen loading paths

Hamada

Sakane

Itoh

et al. 2014

Theoretical and Applied Fracture Mechanics

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High-temperature behaviour of IN 738 LC under isothermal and thermo-mechanical cyclic loading

Cited by 15 publications

References 10 publications

Thermomechanical fatigue behavior of the high-temperature titanium alloy IMI 834

Thermomechanical fatigue behavior of the high-temperature titanium alloy IMI 834

Experimental and numerical studies of thermal-structural behavior based on cast iron scaled cylinder head specimen

High temperature nonproportional low cycle fatigue using fifteen loading paths

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