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Induction hardening is the process of:

Induction hardening is the process of: Correct Answer Hardening surface for wear resistance

Induction hardening: Can be split into two steps:

i) Induction heating: The first one is induction heating, in which electrically conducting metals are heated with an electromagnet.

ii) Quenching: The quenching phase follows directly after to alter the surface of material.

Characteristics:

  • Heat the surface to γ-region (localised heating) using an inductor coil carrying a high frequency current in the range of 2 to 500 kHz.
  • Core: Not heated, Structure remains unaltered.
  • Surface converts to martensite on quenching.
  • Fast heating and short hold time: Need higher austenitization temperature.
  • Martensite forms in fine r (not homogenous) grains.
  • Applicable only for steels especially carbon steels (0.35 – 0.7 %C)
  • Little distortion and good surface finish.

Related Questions

In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: An induction motor can, therefore, be made without electrical connections to the rotor. B: Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. C: An induction motor's rotor can be either wound type or squirrel-cage type. D: An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding.
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Consider the following statement with reference to Popper's solution of the problem of induction, and mark the correct option.
1. There is no rationally justifiable method of induction.
2. There is no reliable method of induction.
3. There is a reliable method of induction.
Choose the correct answer:
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2. It is also known by the term 'on boarding'.
3. It is for the purpose of socialising the new employees.
4. Informal induction is better than formal induction.
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