各位大侠：毕业论文摘要，麻烦帮忙翻译成英文。谢谢！

Hardness is assessing the mechanical properties of metal most commonly used indicator. Hardness is, in essence, another flaky material resistance to compression capability. Hardness testing is to evaluate the mechanical properties of metal fastest, most economical and most of a simple test method. Hardness testing is the main purpose of the applicability of the material. or for the use of materials for the purpose of the special hardening or softening the effect. For testing materials, hardness represent a certain pressure head and the pilot force under a reflection of the flexibility, plasticity, strength, toughness and wear resistance of various physical properties. With the adoption hardness test can reflect different metal materials in the chemical composition, Organizational structure and heat treatment under the conditions of performance differences, hardness test is widely used metal performance testing, Heat Treatment quality supervision and the development of new materials. Metal hardness testing falls into two test methods. A static test methods, these methods impose the pilot of a slow no impact. The hardness of the main decisions on the depth of dimples, dimple or indentation projection area Gravure area size. Static test methods including Brinell, Rockwell, Vickers, Knoop, Wechsler, such as Pap. Including fabrics, Luo, three-dimensional method is the most widely, they are metal hardness testing the test method. Another test method is a dynamic test, these methods of testing are imposed and the impact of dynamic nature. Here, including the Shaw and measuring the hardness test. Dynamic test used mainly large, non-moving parts of hardness testing.

Hardness is one of the most commonly accepted properties of evaluating the mechanical property of metallic materials.