Other spring breaking methods The

Other spring breaking methods The cracking of the spring material along the grain boundary is called intergranular fracture or intergranular fracture. Due to the influence of the orientation of the adjacent grains, the grain boundary atoms are arranged chaotically, so that they are in a higher energy state. In order to reduce the energy of the spring and reduce the grain boundary energy, various impurities or alloy elements are segregated at or near the grain boundary. At the optimal location, the grain boundary strength is weakened. The determination of the chemical composition of the grain boundary by Auger electron spectrometer shows that, in equilibrium, the distribution of solutes in the grain boundary may be 10 to 1000 times higher than that in the crystal. Therefore, the mechanical, physical and chemical properties at the grain boundary are different from those inside the granule. When the force is applied together with the influence of environmental factors, it is easy to break along the grain boundary. The causes of fracture along the product can be roughly divided into four categories. 1. There is a brittle spring precipitation phase on the product world; 2. Pain analysis of impurities and alloy elements at the grain boundaries; 3. Thermal stress; 4. Environment-induced intergranular erosion. Generally, there are two major types of fracture along the product, brittle fracture along the spring and ductile fracture along the spring. Spring brittle intergranular fracture is non-microporous aggregate type intergranular fracture. There are a large number of small dimples on the surface of the spring ductile intergranular new fracture. During the fracture process, a certain amount of terminal deformation occurs along the grain boundary, as shown in Figures 9-1 and 9-2.