The Types Of Metallic Materials Failure

In recent years, as metal materials have become more and more widely used in various fields of production and life, the problem of material failure has become increasingly prominent. Material failure mainly refers to the inability of the mechanical component to complete its intended function due to changes in the size, shape, or organization and performance of the material. In summary, it can be roughly divided into three categories: fracture, wear, and corrosion.

1. Break

According to the amount of material deformation before fracture, it can be divided into ductile fracture and brittle fracture. Before ductile fracture occurs, there will be obvious deformation and deformation process, while brittle fracture has almost no deformation, and the fracture process is extremely short. Due to its sudden occurrence, it is often destructive.

In daily production and life, the most common one is fatigue fracture. The material will fracture under the action of long-term stress cycle; secondly, there is a material fracture failure mode commonly seen in the laboratory, also known as static load fracture, which is usually seen The tensile fracture belongs to this kind of fracture. Compared with the fatigue fracture, the probability of occurrence in the production and life process is much smaller.

2. Wear

Machine parts often work under high-speed, vibration, overload and other working conditions. Surface friction between machines causes material wear and ultimately leads to material failure.

The wear failure of materials can generally be divided into five categories: abrasive wear, adhesive wear, fatigue wear, corrosion wear and fretting wear. Among them, abrasive wear is the most common. During the operation of the machine parts, the wear caused by the intervention of external hard particles or the protrusions of the joint itself is all abrasive wear, and the surface shedding of metal materials also belongs to the category of abrasive wear.

Wear and friction are associated with each other. The following measures are usually used in production: one is to apply lubricating oil on the contact surface to improve the smoothness; the other is to weld the parts together with a welding machine without affecting the normal production to reduce the cost of the parts. Relative movement can reduce friction and wear. Third, in order to reduce friction, the area of ​​the contact surface and the load on the contact surface can be reduced to reduce the friction. In addition, the yield strength of the material can also be improved by exploring.

3. Corrosion

The corrosion of metal materials is due to the chemical and electrochemical reactions between the material and the surrounding medium. There are many kinds of corrosion of metal materials, which can be divided into general corrosion and local corrosion. In daily various corrosion accidents, local corrosion is basically the most common. Local corrosion can be divided into stress corrosion, pitting corrosion, intergranular corrosion, and crevices. Corrosion etc.

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By Minghe Die Casting Manufacturer |Categories: Helpful Articles |Material Tags: Aluminum Casting, Zinc Casting, Magnesium Casting, Titanium Casting, Stainless Steel Casting, Brass Casting,Bronze Casting,Casting Video,Company History,Aluminum Die Casting |Comments Off