Fatigue crack growth properties and relationship of oxide thickness for 1Cr-1Mo-0.25V and 13Cr steels at elevated temperatures.

悦男, 竹内; 三郎, 松岡; 敏, 西島

doi:10.1299/kikaia.53.2223

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Basic Fatigue Properties Equation [16]1

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1989

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“…The values of AKth, C, and rn are listed in Table 2. Since the crack growth test at 773 K in Material-B was not carried out in the present study, the crack growth curve was estimated according to the results of Klesnil et al [18,191,Saitoh et al [20] and Takeuchi et al [21].…”

Section: Basic Fatigue Properties Equation [16]mentioning

confidence: 99%

Fretting Fatigue at Elevated Temperatures in Two Steam Turbine Steels

Mutoh

Satoh

Tsunoda

1989

Fatigue Fract Eng Mat Struct

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Fatigue tests and fretting fatigue tests of two steam turbine steels at room temperature and 773 K were carried out. The reduction of fatigue life and strength in the fretting test were significant at 773 K as well as at room temperature. The values of the friction coefficient at 773 K was almost equal to those at room temperature. The geometry of the fretting fatigue crack was flat in the early stage of fatigue life where a significant effect of fretting was observed. With increasing crack length and with a reducing effect of fretting, the fatigue crack shape changed to a semi-circular form. The fretting fatigue lives predicted on the basis of elastic-plastic fracture mechanics analysis, with the frictional force between the fretting pad and the specimen taken into consideration, agreed well with experimental results at both temperatures.

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Section: Basic Fatigue Properties Equation [16]mentioning

confidence: 99%