Hardening MCQ Quiz - Objective Question with Answer for Hardening - Download Free PDF

\(\begin{array}{l} \delta = \sqrt {\frac{2}{{\omega \mu \sigma }}} \\ {\delta ^2} = \frac{2}{{2\pi f{\mu _0}{\mu _r}\sigma }}\\ f = \frac{1}{{\pi {\delta ^2}{\mu _0}{\mu _r}\sigma }}\\ f = \frac{\rho }{{\pi {\delta ^2}{\mu _0}{\mu _r}}}\\ f = \frac{{5 \times {{10}^{ - 7}}}}{{\pi \times {{\left( {105 \times {{10}^{ - 6}}} \right)}^2} \times 4\pi \times {{10}^{ - 7}} \times 1}} = 11.48\;MHz \end{array}\)

Induction hardening is a form of heat treatment in which a metal part is heated by induction heating and then quenched. Induction heating is a non-contact heating process which utilizes the principle of electromagnetic induction to produce heat inside the surface layer of a work-piece. By placing a ferrous material into a strong alternating magnetic field, electric current can be made to flow in the material thereby creating heat due to the I²R losses in the material. In ferrous materials, further heat is generated below the Curie point due to hysteresis losses.

\(\begin{array}{l} \delta = \sqrt {\frac{2}{{\omega \mu \sigma }}} \\ {\delta ^2} = \frac{2}{{2\pi f{\mu _0}{\mu _r}\sigma }}\\ f = \frac{1}{{\pi {\delta ^2}{\mu _0}{\mu _r}\sigma }}\\ f = \frac{\rho }{{\pi {\delta ^2}{\mu _0}{\mu _r}}}\\ f = \frac{{5 \times {{10}^{ - 7}}}}{{\pi \times {{\left( {105 \times {{10}^{ - 6}}} \right)}^2} \times 4\pi \times {{10}^{ - 7}} \times 1}} = 11.48\;MHz \end{array}\)

Induction hardening is a form of heat treatment in which a metal part is heated by induction heating and then quenched. Induction heating is a non-contact heating process which utilizes the principle of electromagnetic induction to produce heat inside the surface layer of a work-piece. By placing a ferrous material into a strong alternating magnetic field, electric current can be made to flow in the material thereby creating heat due to the I²R losses in the material. In ferrous materials, further heat is generated below the Curie point due to hysteresis losses.