Creep-Resistant Steels
16 - Creep fatigue behaviour and crack growth of steels
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On the physical basis of a Larson-Miller constant of 20
2018, International Journal of Pressure Vessels and PipingCitation Excerpt :This value of C is consistent with the result on aging obtained in Section 3 (C = 12.8). The value agrees also with the optimal values of C reported in the book [2]: C = 13 for creep crack initiation time in 10%Cr-Mo-W-VNbC cast steel at 550 and 600 °C [21], and C = 13.5 for in-reactor creep rupture life of 14%Cr-15%Ni-1.7%Mo-Ti austenitic stainless steel crept at 575 °C–750 °C [22]. Activation energy QLSD for lattice self-diffusion in a material is related to melting temperature TM of the material by Eq. (3), and varies from material to material.
Notch Support for LCF-Loading: A Fracture Mechanics Approach
2016, Procedia Structural IntegrityMultiaxial thermomechanical creep-fatigue analysis of heat-resistant steels with varying chromium contents
2014, International Journal of FatigueCitation Excerpt :The variable loading conditions can shift the critical load to the fatigue domain by superimposed creep on the heated surface of components. Traditionally, creep-fatigue life has been assessed using the results of isothermal uniaxial tests conducted at (or close to) the peak operating temperature [1–5]. As one of the state-of-the-art creep-fatigue assessment procedures, comparison of crack initiation and propagation behavior under TMF (thermomechanical fatigue) and isothermal loading conditions on a modern 10%Cr steel was carried out in [6].
Two lifetime estimation models for steam turbine components under thermomechanical creep-fatigue loading
2014, International Journal of FatigueThe influence of temperature transients on the lifetime of modern high-chromium rotor steel under service-type loading
2013, Materials Science and Engineering: ACitation Excerpt :Temperature transients, constant or variable pressure in pressurized systems and constant or variable speed of turbine rotors produce a large variety of combined static and variable loading conditions. The pressure loading and centrifugal loading on rotors lead to quasi-static (primary) stress (Fig. 1) [1,2]. In addition, temperature transients cause strain cycling with variable thermal (secondary) stresses on the heated surfaces of turbine components.
Creep-fatigue lifetime assessment with phenomenological and constitutive material laws
2013, Procedia Engineering