科研
Effect of TiN inclusion …
Abstract
In the present study, variability in high-cycle fatigue lives has been studied in AISI 52100 high-strength steel containing TiN inclusions at two heat treatment states. It is found that the spatial orientations of TiN inclusions in the samples are randomly distributed, and have no …
How high can the fatigue …
Abstract
Nearly 90% of service failures of metallic components and structures are caused by fatigue. The improvement of fatigue strength could help to reduce the risk of fatigue failure to engineering structures and human lives, and contribute to lightweight design, thereby enhancing the efficiency …
Evaluating fatigue …
Abstract
To propose a time-saving method for evaluating the fatigue strength of carburized steel, the fatigue behavior and fracture mechanism of carburized 14Cr14Co13Mo5 steels are studied by the rotary bending fatigue tests. It is found that the fatigue crack initiation site changes from surface to …
Crack initiation …
Abstract
The nucleation ofmicrostructural fatigue cracks in AISI 4340 steel is investigated. The pre-electropolished specimen is employed for the observation of the very early stage of fatigue crack initiation correlated with the microstructure. It is found that there are precipitate-free zones …
Crack branching and …
Abstract
The high-cycle torsional fatigue crack propagation behaviors of the martensitic AISI 4340 steel were investigated in this work. Quantitative analyses of fracture processes were conducted to establish the branching mechanisms in the early crack propagation stage and the deflection in the …
Short fatigue crack …
Abstract
In recent decades, it has been found that the fatigue crack growth rate could be slowed down by the zigzag crack growth path in some materials, but the mechanism was not well clarified. In this study, the effect of crack growth path on the fatigue crack growth rate of 18Ni maraging steel …
A fast evaluation method …
Abstract
The relationship between fatigue strength and tensile properties has drawn widespread concern in recent decades. It is gradually recognized that the fatigue strength is dependent on the strength of the weakest zone in materials, while the regular tensile test could only obtain the global …