Multiaxial Creep Deformation and Influence of Different Precipitates on Creep Cavitation Failure of 304HCu SS
Source abstract
Abstract
Influences of multiaxial creep deformation and rupture behavior on 304HCu austenitic stainless steel have been investigated on carrying out creep rupture test on both smooth and notch specimens at 1023 K over a wide range of stress (100-200 MPa). Creep rupture strength exhibited an increasing trend with increase in notch sharpness (that is, notch strengthening effect) leading to a saturation and was associated with decrease in ductility. At relatively lower stresses, material possesses propensity to notch weakening which prevails for relatively sharper notches. Fractographic studies revealed that proportion of transgranular ductile dimple to intergranular creep cavitation is more pronounced for relatively shallow notches and at lower test temperature. With increase in test temperature and for sharper notches, the proportion of intergranular creep cavitation to transgranular ductile dimple becomes more prevalent. The influence of notch on creep rupture life and fracture behavior has been analyzed through different component of stationary state of stress distribution estimated by Finite Element Analysis (FEA). In addition to the different state of stress, the presence of different sub-microscopic precipitates (M23C6, NbC and Cu) also is found to play a vital role in creep deformation and fracture behavior. FEA of state of stress and strain across the precipitates have been assessed to estimate the influence of the precipitation on creep cavity nucleation at 923, 973 and 1023 K. The creep rupture life and ductility of the material having different notches have been predicted using different models of representative stress at the skeletal point. Further, a modified model has been proposed for the prediction of multiaxial ductility for any temperature which is found suitable for other steels as well.
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Research context
OpenAlex topics: Nuclear Materials and Properties · Fusion materials and technologies · High Temperature Alloys and Creep
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References (69)
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