Heat treatment classification and hardness testing methods:
1. The hardness of the heat-treated workpiece is measured using a hardness tester. The PHR series portable surface Rockwell hardness tester is very suitable for testing the hardness of surface heat treated workpieces. It can test various surface heat treatment workpieces with effective depth exceeding 0.1mm. The operation is simple, easy to use, and low in price, and the hardness value can be directly read.
2. Surface heat treatment is divided into two categories, one is surface quenching and tempering heat treatment, and the other is chemical heat treatment. The hardness test method is as follows: chemical heat treatment is to atomize the surface of the workpiece into one or several chemical elements, thereby Change the chemical composition, texture and properties of the workpiece surface. After quenching and low temperature tempering, the surface of the workpiece has high hardness, wear resistance and contact fatigue strength, and the core of the workpiece has high toughness.
3. The main technical parameters of the chemical heat treatment workpiece are the depth of the hardened layer and the surface hardness. The depth of the hardened layer is still to be measured with a Vickers hardness tester. Detect the distance from the surface of the workpiece to the point where the hardness drops to 50 HRC. This is the surface hardness test of the effective hardened deep chemical heat treatment workpiece is similar to the hardness test of the surface hardened heat treatment workpiece, and can be detected by Vickers hardness tester, surface Rockwell hardness tester or Rockwell hardness tester, but the thickness of nitriding is thicker than that. Thin, generally not more than 0.7mm, then you can no longer use Rockwell hardness tester. If the local hardness of the part is high, the local quenching heat treatment can be performed by means of induction heating. Such parts are usually marked with the local quenching heat treatment position and local hardness value on the drawing. The hardness test of the part is to be carried out in the specified area. The hardness testing instrument can use the Rockwell hardness tester to test the HRC hardness value. If the heat treatment hardened layer is shallow, the surface Rockwell hardness tester can be used to test the HRN hardness value.
4. Surface quenching and tempering heat treatment is usually carried out by induction heating or flame heating. The main technical parameters are surface hardness, local hardness and effective hardened layer depth. The hardness test can be carried out using a Vickers hardness tester or a Rockwell or surface Rockwell hardness tester. The choice of test force (scale) is related to the effective hardened layer depth and the surface hardness of the workpiece. There are three hardness testers involved here. The Vickers hardness tester is an important means to test the surface hardness of heat-treated workpieces. It can be used to test the surface hardened layer as thin as 0.05mm thick with a test force of 0.5-100kg. Its precision is the highest, and the hardness of the surface of the workpiece can be distinguished. difference. In addition, the effective hardened layer depth is also measured by a Vickers hardness tester. Therefore, it is necessary to equip a unit for surface heat treatment or a large number of surface heat treatment workpieces with a Vickers hardness tester.
5. The surface Rockwell hardness tester is also very suitable for testing the hardness of surface hardened workpieces. The surface Rockwell hardness tester has three scales to choose from. Various surface hardened workpieces with effective hardening depths in excess of 0.1 mm can be tested. Although the accuracy of the surface Rockwell hardness tester is not as high as the Vickers hardness tester, it has been able to meet the requirements as a means of quality management and inspection of the heat treatment plant. Moreover, it has the characteristics of simple operation, convenient use, low price, rapid measurement, and direct reading of hardness value. The surface Rockwell hardness tester can be used for rapid and non-destructive part-by-piece inspection of batch surface heat treatment workpieces. This is important for metalworking and mechanical manufacturing plants. When the surface heat-treated hardened layer is thick, a Rockwell hardness tester can also be used. When the thickness of the hardened layer is 0.4 to 0.8 mm, the HRA scale can be used, and when the thickness of the hardened layer exceeds 0.8 mm, the HRC scale can be used.
6, Vickers, Rockwell and surface Rockwell three hardness values ​​can be easily converted to each other, converted to standards, drawings or user-required hardness values. The corresponding conversion tables are given in the international standard ISO, the American standard ASTM and the Chinese standard GB/T.
1. The hardness of the heat-treated workpiece is measured using a hardness tester. The PHR series portable surface Rockwell hardness tester is very suitable for testing the hardness of surface heat treated workpieces. It can test various surface heat treatment workpieces with effective depth exceeding 0.1mm. The operation is simple, easy to use, and low in price, and the hardness value can be directly read.
2. Surface heat treatment is divided into two categories, one is surface quenching and tempering heat treatment, and the other is chemical heat treatment. The hardness test method is as follows: chemical heat treatment is to atomize the surface of the workpiece into one or several chemical elements, thereby Change the chemical composition, texture and properties of the workpiece surface. After quenching and low temperature tempering, the surface of the workpiece has high hardness, wear resistance and contact fatigue strength, and the core of the workpiece has high toughness.
3. The main technical parameters of the chemical heat treatment workpiece are the depth of the hardened layer and the surface hardness. The depth of the hardened layer is still to be measured with a Vickers hardness tester. Detect the distance from the surface of the workpiece to the point where the hardness drops to 50 HRC. This is the surface hardness test of the effective hardened deep chemical heat treatment workpiece is similar to the hardness test of the surface hardened heat treatment workpiece, and can be detected by Vickers hardness tester, surface Rockwell hardness tester or Rockwell hardness tester, but the thickness of nitriding is thicker than that. Thin, generally not more than 0.7mm, then you can no longer use Rockwell hardness tester. If the local hardness of the part is high, the local quenching heat treatment can be performed by means of induction heating. Such parts are usually marked with the local quenching heat treatment position and local hardness value on the drawing. The hardness test of the part is to be carried out in the specified area. The hardness testing instrument can use the Rockwell hardness tester to test the HRC hardness value. If the heat treatment hardened layer is shallow, the surface Rockwell hardness tester can be used to test the HRN hardness value.
4. Surface quenching and tempering heat treatment is usually carried out by induction heating or flame heating. The main technical parameters are surface hardness, local hardness and effective hardened layer depth. The hardness test can be carried out using a Vickers hardness tester or a Rockwell or surface Rockwell hardness tester. The choice of test force (scale) is related to the effective hardened layer depth and the surface hardness of the workpiece. There are three hardness testers involved here. The Vickers hardness tester is an important means to test the surface hardness of heat-treated workpieces. It can be used to test the surface hardened layer as thin as 0.05mm thick with a test force of 0.5-100kg. Its precision is the highest, and the hardness of the surface of the workpiece can be distinguished. difference. In addition, the effective hardened layer depth is also measured by a Vickers hardness tester. Therefore, it is necessary to equip a unit for surface heat treatment or a large number of surface heat treatment workpieces with a Vickers hardness tester.
5. The surface Rockwell hardness tester is also very suitable for testing the hardness of surface hardened workpieces. The surface Rockwell hardness tester has three scales to choose from. Various surface hardened workpieces with effective hardening depths in excess of 0.1 mm can be tested. Although the accuracy of the surface Rockwell hardness tester is not as high as the Vickers hardness tester, it has been able to meet the requirements as a means of quality management and inspection of the heat treatment plant. Moreover, it has the characteristics of simple operation, convenient use, low price, rapid measurement, and direct reading of hardness value. The surface Rockwell hardness tester can be used for rapid and non-destructive part-by-piece inspection of batch surface heat treatment workpieces. This is important for metalworking and mechanical manufacturing plants. When the surface heat-treated hardened layer is thick, a Rockwell hardness tester can also be used. When the thickness of the hardened layer is 0.4 to 0.8 mm, the HRA scale can be used, and when the thickness of the hardened layer exceeds 0.8 mm, the HRC scale can be used.
6, Vickers, Rockwell and surface Rockwell three hardness values ​​can be easily converted to each other, converted to standards, drawings or user-required hardness values. The corresponding conversion tables are given in the international standard ISO, the American standard ASTM and the Chinese standard GB/T.
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