What is Marquenching / Martempering?

Q.  Which of the following processes permit the transformation of austenite to martensite, throughout the cross-section of a component without cracking or distortion?
- Published on 11 Sep 15

a. Martempering
b. Marquenching
c. Both a. and b.
d. None of the above

ANSWER: Both a. and b.

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    Discussion

  • Sravanthi    -Posted on 12 Nov 15
    - Martempering process is used to overcome restrictions of conventional quenching and tempering. It is a heat treatment process which includes anesthetization followed by quenching. This process takes place at a fast rate so as to avoid formation of pearlite, bainite, or ferrite.

    - Martempering is also known as marquenching. This process permits transformation of austenite to martensite, throughout the cross-section of a component without cracking or distortion.

    - Steel is heated above the upper critical point in martempering and then it is quenched in a salt bath which is kept at a temperature of 150° C to 300° C. Martensite is produced without developing any stresses.

    - This process is used for hardening steel gears, gear train guide bars, valves, etc.

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