Mechanical properties of metal materials

The performance of the metal material generally divided into two categories, process performance and performance. Process performance refers to the mechanical parts in the process of processing and manufacturing, metal materials under the cold and hot working conditions of performance. The stand or fall of metal material performance, determines its processing forming during the process of manufacturing the ability to adapt. Due to the different processing conditions, the requirements of the process performance is different also, such as the casting performance and weldability, malleability, heat treatment, cutting machining performance, etc. Performance refers to the mechanical parts under the condition of use, performance of metal materials, it includes the mechanical properties, physical properties, chemical properties, etc. The stand or fall of metal material performance, determines the scope of its use and service life. In mechanical manufacturing, general machinery parts are in normal temperature, atmospheric pressure and not strong corrosive medium, and in the process of using all the mechanical parts will be under different load. Metal materials under the action of load resistance performance, mechanical properties ( Or mechanical properties) 。 Mechanical properties of metallic materials is part of the main basis of design and material selection. Loads different nature, Such as tensile, compression, torsion, impact and cyclic load, etc. ) And mechanical properties of metallic materials requirements will also be different. The commonly used mechanical properties include: strength, plasticity, hardness, impact toughness, repeated impact resistance and fatigue limit, etc. The following will discuss various mechanical properties respectively. Strength strength refers to metal material under static loading to resist damage ( Too much plastic deformation or fracture) Performance. As a result of the action of load way has the form such as tensile, compression, bending, shear, so the strength also divided into tensile strength, compressive strength, bending strength, shear strength and so on. Always have a connection between various strength, more commonly in use in the strength of the tensile strength as the most basic pointer. Plastic plastic refers to metal materials under the action of load, produce plastic deformation, Permanent deformation) Without damage. Hardness hardness is a measure of degree of hard and soft metal materials of the pointer. At present in the production of measuring hardness is pressed into the hardness of the most commonly used method, it is to use a certain geometry head to a certain load tested down into the surface of the metal material, according to the degree by the determination of the hardness value. The commonly used methods are brinell hardness ( HB） , rockwell hardness ( HRA、HRB HRC) And vickers hardness ( HV） Methods. In front of the fatigue strength, plasticity and hardness are discussed on the mechanical properties of the metal under the action of static load Pointers. In fact, many machine parts are working under cyclic load, under the condition of the parts will get tired. Impact toughness at great speed of load acting on the object known as impact load, the metal's ability to resist damage under impact load is called the impact toughness.