Surface of the heat treatment is divided into two categories, the surface hardening heat treatment and the other is the chemical heat treatment, the hardness test method is as follows: chemical treatment is to make the surface into one or several atoms of chemical elements, thus changing the work piece surface chemical composition, structure and properties. After quenching and tempering, the work piece surface with high hardness, wear resistance and contact fatigue strength, while the Ministry of the core parts with high strength and toughness. Chemical heat treatment of the main technical parameters of the work piece is hardened layer depth and surface hardness. Hardened layer depth and use the Vickers hardness test. Detect from the surface down to the hardness of 50HRC point distance. This is the effective depth of hardening heat treatment of the work piece surface hardness of chemical detection and quenching of the work piece surface hardness testing similar, you can use the Vickers hardness, Rockwell hardness of the surface or Rockwell hardness tester to detect, but the thickness of relatively thick nit riding thin, generally less than 0.7mm, then you can not use a Rockwell hardness tester. If the local hardness higher parts, induction heating, etc. can be partial quenching, such parts are usually in the drawing the location of local quenching and local hardness values. Parts of the hardness test carried out in designated areas. Hardness testing instruments can be used Rockwell hardness tester, hardness testing HRC, such as the hardened layer of shallow, superficial Rockwell hardness tester can be used to test the hardness value of HRN.
Surface hardening heat treatment is usually with induction heating or flame heating manner. The main technical parameters of the surface hardness, the local hardness and effective are hardened layer depth. Vickers hardness testing hardness tester can be used, but also can be used or the surface Rockwell hardness tester. Test force (ruler) of the selection and effective case depth and hardness of the work piece surface. This involves three harnesses. Vickers hardness test heat treatment is an important means of surface hardness, it can use 0.5 ~ 100kg test force, test the surface of thin to 0.05mm thick hardened layer, it is the highest accuracy can distinguish small surface hardness the difference. In addition, the effective case depth but also by the Vickers hardness tester to detect, so the surface heat treatment process or for extensive use of surface heat treatment of the work piece unit, equipped with Vickers hardness tester is necessary.
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