Fatigue Properties and Fracture Surface Analysis of Plazma-nitrided Cold Work Tool Steel

Interior Fracture Mechanism Analysis and Fatigue Life Prediction of Surface-Hardened Gear Steel under Axial Loading

The interior defect-induced fracture of surface-hardened metallic materials in the long life region has become a key issue on engineering design. In the present study, the axial loading test with fully reversed condition was performed to examine the fatigue property of a surface-carburized low alloy gear steel in the long life region. Results show that this steel represents the duplex S-N (stre...

Influence of Surface Finishing on Fatigue Properties of Valve Steel

The fatigue strength of flapper valves depends among other things on surface properties of the steel. This paper deals with the effect of a tumbling method*) on bending and tensile fatigue properties of test bars. For carbon steel SANDVIK 20C an improvement was observed in several test series, particularly in the transverse direction of the strip, whereas there was little effect for stainless s...

Analysis of Fatigue Crack Paths in Cold Drawn Pearlitic Steel

In this paper, a fracto-metallographic analysis was performed on the cracked specimens of cold drawn pearlitic steel subjected to fatigue tests. Fatigue cracks are transcollonial and exhibit a preference for fracturing pearlitic lamellae, with non-uniform crack opening displacement values, micro-discontinuities, branchings, bifurcations and frequent local deflections that create microstructural...

The Effect of Deep Cryogenic Treatment on Microstructure, Hardness and Wear Behavior of INDRA 5 Cold Work Tool Steel

Fatigue Failure of Structural Steel – Analysis Using Fracture Mechanics

Fatigue is the major threat in service of steel structure subjected to fluctuating loads. With the additional effect of corrosion and presence of weld joints the fatigue failure may become more critical in structural steel. One of the apt examples of such structural is the sailing ship. This is experiencing a constant stress due to floating and a pulsating bending load due to the waves. This pa...