... of tempering time and tempering temperature on hardness by means of neural networks (NNs). Five types of steels, SAE 4140, SAE 4340, SAE 5160, SAE 6150, and SAE 52 100, were tempered in different conditions. The inputs of the NNs were the chemical composition, the tempering time, and tempering temperature...

.... The influences of additional elements on the microstructure, adhesion, mechanic, and tribological properties have been investigated. XRD Results showed that preferred orientation of CrMoN and CrWN coatings obviously changed compared with that of the pure CrN coating. All of the new hard coatings exhibited...

... and the measured hardness diminishes, implying a reduced contribution of the self-organized stable nanostructure. The dry friction coefficients of the Ti–Al–Si–C–N coatings are about 0.3, which is lower than that of conventional Ti–Si–N coatings. These coatings can find potential applications requiring heavy...

..., adhesion, and physical degradation (i.e., reversion, cracking, hardness, etc.) are compared after a 22 year exposure to outdoor weathering in South Florida. 2008-06-25 - 2008-06-26 Presented at the ASTM Third Symposium on Durability of Building and Construction Sealants and Adhesives Denver, CO...

...Kwang-Soo Lee; Ji-Ho Song Fatigue properties such as strain-life (ε- N ) curves are usually obtained by performing fatigue tests. However, as fatigue testing requires time and high cost, many methods have been proposed to estimate the strain-life curves from simple tensile data or hardness. Based...

... a servohydraulic fatigue test machine. The experimental results showed that tensile mean stress degraded the fatigue limit. However, the tensile mean stress did not affect the decrease in the surface hardness as a result of fatigue loading for the specimen without a defect. In the case of the specimen...

...Y Kondo; C Sakae; M Kubota; M Kashiwagi Fatigue tests were performed on materials containing small cracks to investigate the effects of material hardness, mean stress, and crack size on the threshold stress intensity factor of small cracks. The crack closure measurement on a very small crack...

..., 2 MeV protons were used to introduce up to seven displacements per atom in Zircaloy 4 at 350°C. The effect on the intermetallic precipitates, the formation of dislocation loops and hardness were investigated by analytical and high-resolution transmission electron microscopy (TEM). In addition...