Induction Hardening:
In induction hardening, the part to be hardened is surrounded by a coil through which an electric current at high frequency is passed. Frequency of the current at high frequency of the current will be from 80 kilohertz (80000 Hertz) to 15000 kilohertz depending upon the depth of hardening required. High frequency. Higher the frequency, shallower the depth of heating. The part gets heated by means of this high frequency current to the hardening temperature and then it is quenched to get the necessary hardness. As this is very fast process, it prevent grain growth, decarburization and distortion.
Carbo nitriding:
In carob-nitriding process, diffusion of carbon and nitrogen takes place in a furnace at high temperature and in suitable gaseous atmosphere. Temperature between 6500-9500C can be used, but usual temperatures are between 8200-8400C. The part is then quenched on removal from the furnace. In this process, hardness is not obtained due to nitrides of the alloys and is, therefore, not a nitriding process. The gases used consist of mixture of ammonia and hydrocarbon gas, such as methane, propane, etc.
In induction hardening, the part to be hardened is surrounded by a coil through which an electric current at high frequency is passed. Frequency of the current at high frequency of the current will be from 80 kilohertz (80000 Hertz) to 15000 kilohertz depending upon the depth of hardening required. High frequency. Higher the frequency, shallower the depth of heating. The part gets heated by means of this high frequency current to the hardening temperature and then it is quenched to get the necessary hardness. As this is very fast process, it prevent grain growth, decarburization and distortion.
Carbo nitriding:
In carob-nitriding process, diffusion of carbon and nitrogen takes place in a furnace at high temperature and in suitable gaseous atmosphere. Temperature between 6500-9500C can be used, but usual temperatures are between 8200-8400C. The part is then quenched on removal from the furnace. In this process, hardness is not obtained due to nitrides of the alloys and is, therefore, not a nitriding process. The gases used consist of mixture of ammonia and hydrocarbon gas, such as methane, propane, etc.
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