Research on Detection Methods of Hardeness of Heat Treatment Workpieces
Abstract
Heat treatment is widely used in the production field and can greatly improve the material performance and mechanical properties of workpieces. The comprehensive measurement of hardness is an important indicator of the degree of heat treatment. This paper introduces the common detection methods of hardness in heat treatment, including Rockwell hardness tester, Brinell hardness tester and Vickers hardness tester, and discusses the advantages and disadvantages of each. Finally, different detection methods are selected according to the characteristics of the workpiece material.
Keywords: heat treatment workpiece; hardness;Rockwell hardness tester; Brinell hardness tester; Vickers hardness tester
1 Introduction
Heat treatment is an important process of forming mechanical parts. Various methods are used to improve the mechanical properties of the material and the mechanical parts, which will directly affect the performance, stability and reliability of the mechanical parts. Hardness is a complex physical quantity of the material, which is used to measure the intensity of the material. It is widely used in the field of equipment manufacturing. Heat treatment hardness is an important indicator to measure the heat treatment effect and performance of workpiece materials. There are many ways to measure its hardness. This article mainly introduces several commonly used hardness testing methods and their characteristics, and finally selects different methods according to the material characteristics of the workpiece.
2 Commonly Used Heat Treatment Hardness Testing Methods
2.1 Rockwell Hardness Tester
The Rockwell hardness tester is the most widely used hardness testing method. It is mainly used to test the hardness of medium and high hardness materials, and is not suitable for low hardness materials. The Rockwell hardness tester can quickly and accurately provide the hardness test results of the workpiece material. The operating process is simple and the operation accuracy is also high. The result obtained is a numerical value, which is generally indicated by HRA, HRB and HRC.
2.2 Brinell Hardness Tester
The Brinell hardness tester is suitable for testing the hardness of all kinds of metal materials in heat treatment. Unlike the Rockwell hardness tester, the Brinell hardness tester measures the indentation left on the workpiece by a metal ball and measures its size. The test is accurate, but it is more time-consuming and requires a good skill to analyze the test results. The result obtained is a numerical value, which is generally expressed in BHN.
2.3 Vickers Hardness Tester
The Vickers hardness tester is mainly used to test the hardness of cast steel, alloy steel and non-ferrous metal materials. Compared to the Brinell hardness tester, the Vickers hardness tester is more accurate and the measurement range is wider. Its main feature is that a very small indenter is used to indent the workpiece, and the size of the indentation is measured to determine the hardness value. The result obtained is a numerical value, which is generally indicated by HV, DHV, etc.
3 Discussion
The above three hardness testing methods have their own advantages and disadvantages. The Rockwell hardness tester has the advantages of simple operation and high operating accuracy; The Brinell hardness tester can be used to test the hardness of all kinds of metal materials, and the test results are accurate; The Vickers hardness tester is more accurate than the Brinell hardness tester, and the measurement range is wider. But in the actual operation process, the Brinell hardness tester and the Vickers hardness tester are more cumbersome, and the test results need to be analyzed by experienced personnel.
4 Conclusion
In the process of heat treatment, the comprehensive measurement of hardness of the workpiece is an important indicator to measure the heat treatment effect and performance of the workpiece material. At present, Rockwell, Brinell and Vickers hardness testers are the most commonly used hardness testing methods. Each method has its own advantages and disadvantages. Different detection methods should be selected according to the hardness and material characteristics of the workpiece material.
