Low Cycle Fatigue and Relaxation Performance of Ferritic-Martensitic Grade P92 Steel

被引：19

作者：

Juergens, Maria ^{[1
]}

Olbricht, Juergen ^{[1
]}

Fedelich, Bernard ^{[1
]}

Skrotzki, Birgit ^{[1
]}

机构：

[1] Bundesanstalt Mat Forsch & Prufung BAM, Div Expt & Model Based Mech Behav Mat 5 2, D-12205 Berlin, Germany

来源：

METALS | 2019年 / 9卷 / 01期

关键词：

ferritic-martensitic steel; P92; low cycle fatigue; relaxation fatigue; cyclic softening; THERMOMECHANICAL FATIGUE; LIFE ASSESSMENT; POWER-PLANTS; BEHAVIOR; TEMPERATURE; DEFORMATION;

D O I：

10.3390/met9010099

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Due to their excellent creep resistance and good oxidation resistance, 9-12% Cr ferritic-martensitic stainless steels are widely used as high temperature construction materials in power plants. However, the mutual combination of different loadings (e.g., creep and fatigue), due to a "flexible" operation of power plants, may seriously reduce the lifetimes of the respective components. In the present study, low cycle fatigue (LCF) and relaxation fatigue (RF) tests performed on grade P92 helped to understand the behavior of ferritic-martensitic steels under a combined loading. The softening and lifetime behavior strongly depend on the temperature and total strain range. Especially at small strain amplitudes, the lifetime is seriously reduced when adding a hold time which indicates the importance of considering technically relevant small strains.

引用

页数：25

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