An assessment of creep deformation and rupture behaviour of 9Cr–1.8W–0.5Mo–VNb (ASME grade 92) steel

Creep behavior and microstructural evolution of a 9%Cr steel with high B and low N contents

“…The present steel is characterized by an improved creep resistance. The time to rupture was 4883 h, which is more than 2.5 times longer than that in other P92-type steels under the same creep conditions [4,5,8,29]. Three distinctive creep stages, i.e.…”

“…High-chromium martensitic steels are widely used as creep resistant structural materials for various fossil power plant elements, which are exploited at elevated temperatures [1,2]. A P92-type steel alloyed with 0.1%C, 9%Cr, 2%W, 0.5%Mo, 0.2%V, 0.05%Nb is a typical representative of such steels [1][2][3][4][5]. Their alloying composition is designed to provide a long-term creep resistance at high temperatures.…”

Evolution of Lath Substructure and Internal Stresses in a 9% Cr Steel during Creep

“…It should be noted that the Orowan mechanism effectively operates at low temperatures and at rather high strain rates, whereas moving dislocations can overcome the obstacles via diffusion-controlled local climbing under creep conditions at elevated temperatures. 2,[41][42][43][44][45] It is unlikely that the Orowan mechanism is responsible for the creep behaviour under the studied conditions. The local climb model predicts a threshold stress approximately 40% of the experimental one and, therefore, can contribute to the creep resistance of the steel.…”

Predicting sample lifetimes in creep fracture of heterogeneous materials

“…Generally and depending on the material, the constant a attains values that reflect the typical shape of the creep curve and, in particular, it is often much smaller than 0.83 (see Refs. [27,28] for examples). This behavior is reminiscent to what is known in materials science as the Monkman-Grant (MG) relation [29], where t c is often correlated with the minimum strain rate, t,min [30].…”