Metal fatigue test generally has a long test cycle and high test cost. In order to shorten the test time and reduce the test cost, the energy method has become one of the important methods of fatigue test research. The fatigue process of metal materials is a process of...
Lifting fatigue test is the most commonly used and accurate test method to detect the fatigue limit of metal materials or structures. On the basis of determining the fatigue strength by the conventional fatigue test method, or when the fatigue strength of the material or structure with a specified...
The fatigue fracture process of metal casting includes fatigue crack nucleation and initiation, fatigue crack propagation and final instantaneous crack. There are different classification methods of fatigue fracture from different angles. According to the strain classification of the material before fracture, it can be divided into brittle fracture and...
Single point fatigue test is applicable to the service of metal components under rotating bending load at room temperature, high temperature or corrosive air. The single point fatigue test method is generally used to approximately determine the fatigue curve and roughly estimate the fatigue limit when the number of...
A large number of experimental studies have proved that in general, the higher the purity of metal, the better its ductility. The addition of alloying elements can promote the transformation of fracture mode from ductile fracture to brittle fracture, and the addition of alloying elements can strengthen the fatigue...
In fact, the fatigue failure of materials is mainly due to the irreversible change of the material structure. When the stress borne by the material itself is higher than the material bearing limit, the material structure will be damaged, and the damage will accumulate continuously. When the accumulation reaches...
The preparation of metal semi-solid slurry is the key link of its processing technology, which is directly related to the quality and performance of semi-solid parts. Semi solid slurry requires stable spherulites or near spherulites with uniform and fine non dendritic structure. At present, the main semi-solid slurry preparation...
Figure 1 shows the tensile yield strength, tensile strength and elongation of T6 alloy at room temperature and high temperature. It can be seen from Fig. 1A that the yield strength of the alloy decreases with the increase of temperature and increases with the increase of Y content. The...
Figure 1 shows the aging hardening curve of Mg – 0.43nd – XY – 0.08zn – 0.11zr alloy at 200 ℃. With the increase of Y content from 0 to 0.12%, the peak hardness increases slowly from 71 hv to 74 HV. The addition of Y prolongs the time...
Figure 1 shows the optical structure of Mg – 0.43nd – XY – 0.08zn – 0.11zr alloy after solution treatment. With the increase of Y content from 0 to 0.12%, the grain size of the alloy decreases from 70 μ m to 49 μ M. When y element is...