The creep rupture properties of a low Re content second-generation directionally solidified superalloy DZ59

If the creep rupture .

The interface carbon diffusion,mechanical properties of joints and thermal stress on the interface area have been investigated by means of creep rupture tests,EPMA analysis.

Forecasting of instability zones induced by creep fracture of tunnel rockmass;

Creep and creep fracture tests for the macro mechanical heterogeneous dissimilar steel welded joints fabricated by flash butt welding with high strength match (B M W H B L),low strength match (B H W L B M) and medium strength match (B L W M B H) were carried out respectively.

Analyses Ⅲ crack creep fracture under the influence of the initial co_linear array of microcracks antiplane using macrocrack_microcrack inteaction model and the theory of stress intensity factors for creep fracture,and presents the relation between the concrete antiplane Ⅲ crack stress intensity factors for creep fracture and the initial stress intensity factors was obtained.

Studies were made on the nucleation of creep cavities and propagation of creep cracks in steel 20Cr11MoVNbNB at 550-650℃.

Because the pendent reheater tubes were subjected to thermal shock of steam blown by a sootblower during service,the thermal fatigue crack on outside surface was caused,and the creep crack adjacent to inner surface subsequently appeared.

In order to predict the in-vessel core melt progression accurately and provide probabilistic safety assessment(PSA) level 2 with the reliable initialization conditions,the creep rupture failure of primary loops pressure boundary was taken into account in code calculation.

In order to predict the in-vessel core melt progression accurately and provide PSA-2 with the reliable initialization conditions,the creep rupture failure of primary loops pressure boundary is taken into account in code calculation.