TMF Life Prediction of High Temperature Components Made of Cast Iron HiSiMo: Part I: Uniaxial Tests and Fatigue Life Model

Hartrott, Philipp von; Seifert, Thomas; Dropps, Steven

doi:10.4271/2014-01-0915

Cited by 16 publications

(3 citation statements)

References 8 publications

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“…The isothermal fatigue tests use so-called complex low-cycle fatigue tests (CLCF) in which during a complex strain history in the first cycles different strain rates (10 −3 , 10 −4 , 10 −5 1/s) are used and dwell times of 1800 s are applied under tensile and compressive load (see Figure 1). This complex part of the test allows a direct evaluation of the timedependent material behavior like strain rate dependency and stress relaxation in one test [46]. Subsequently, in the cyclic part of the test following the complex part, the specimen is tested with a constant strain rate of 10 −3 1/s with a constant mechanical strain amplitude until failure of the specimen defined by a 5% drop of the maximum stress in tension with respect to ISO 12106.…”

Section: Isothermal and Thermomechanical Low-cycle Fatigue Testsmentioning

confidence: 99%

A Temperature-Dependent Viscoplasticity Model for the Hot Work Steel X38CrMoV5-3, Including Thermal and Cyclic Softening under Thermomechanical Fatigue Loading

2023

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In this paper, a temperature-dependent viscoplasticity model is presented that describes thermal and cyclic softening of the hot work steel X38CrMoV5-3 under thermomechanical fatigue loading. The model describes the softening state of the material by evolution equations, the material properties of which can be determined on the basis of a defined experimental program. A kinetic model is employed to capture the effect of coarsening carbides and a new isotropic cyclic softening model is developed that takes history effects during thermomechanical loadings into account. The temperature-dependent material properties of the viscoplasticity model are determined on the basis of experimental data measured in isothermal and thermomechanical fatigue tests for the material X38CrMoV5-3 in the temperature range between 20 and 650 ∘C. The comparison of the model and an existing model for isotropic softening shows an improved description of the softening behavior under thermomechanical fatigue loading. A good overall description of the experimental data is possible with the presented viscoplasticity model, so that it is suited for the assessment of operating loads of hot forging tools.

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Section: Isothermal and Thermomechanical Low-cycle Fatigue Testsmentioning

confidence: 99%

A Temperature-Dependent Viscoplasticity Model for the Hot Work Steel X38CrMoV5-3, Including Thermal and Cyclic Softening under Thermomechanical Fatigue Loading

2023

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“…In particular, exhaust manifolds undergo small scale yielding in service in their most stressed points, up to 1 pct equivalent plastic strain at full load, [9] and thermo-mechanical fatigue occurs in the low-cycle, elastic-plastic regime. [9][10][11][12] For the above reasons, previous studies, concerning the fatigue behavior of Si-Mo cast irons, have been almost exclusively devoted to low-cycle, low strain rate fatigue at elevated temperature, [9][10][11][12] or to thermal fatigue. [13] In particular, the maximum strain rate during previous high-temperature fatigue tests was equal to or lower than 10 À3 s À1 [11,12] and the number of cycles was less than 30,000.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12] For the above reasons, previous studies, concerning the fatigue behavior of Si-Mo cast irons, have been almost exclusively devoted to low-cycle, low strain rate fatigue at elevated temperature, [9][10][11][12] or to thermal fatigue. [13] In particular, the maximum strain rate during previous high-temperature fatigue tests was equal to or lower than 10 À3 s À1 [11,12] and the number of cycles was less than 30,000. [11] However, with the adoption of downsizing and turbocharging in engine design, other damage mechanisms are becoming relevant, such as vibrations.…”

Section: Introductionmentioning

confidence: 99%

High-Cycle Fatigue Resistance of Si-Mo Ductile Cast Iron as Affected by Temperature and Strain Rate

Matteis

Scavino

Castello

et al. 2015

Metall Mater Trans A

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Silicon-molybdenum ductile cast irons are used to fabricate exhaust manifolds of internal combustion engines of large series cars, where the maximum pointwise temperature at full engine load may be higher than 973 K (700°C). In this application, high-temperature oxidation and thermo-mechanical fatigue (the latter being caused by the engine start and stop and by the variation of its power output) have been the subject of several studies and are well known, whereas little attention has been devoted to the high-cycle fatigue, arising from the engine vibration. Therefore, the mechanical behavior of Si-Mo cast iron is studied here by means of stress-life fatigue tests up to 10 million cycles, at temperatures gradually increasing up to 973 K (700°C). The mechanical characterization is completed by tensile and compressive tests and ensuing fractographic examinations; the mechanical test results are correlated with the cast iron microstructure and heat treatment.

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The Oxidation of the HiSiMo Cast Irons Alloyed with Cr/Al at 800 °C

et al. 2022

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TMF Life Prediction of High Temperature Components Made of Cast Iron HiSiMo: Part I: Uniaxial Tests and Fatigue Life Model

Cited by 16 publications

References 8 publications

A Temperature-Dependent Viscoplasticity Model for the Hot Work Steel X38CrMoV5-3, Including Thermal and Cyclic Softening under Thermomechanical Fatigue Loading

A Temperature-Dependent Viscoplasticity Model for the Hot Work Steel X38CrMoV5-3, Including Thermal and Cyclic Softening under Thermomechanical Fatigue Loading

High-Cycle Fatigue Resistance of Si-Mo Ductile Cast Iron as Affected by Temperature and Strain Rate

The Oxidation of the HiSiMo Cast Irons Alloyed with Cr/Al at 800 °C

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