Final phase in martempering process

Q.  Which of the following statements is/are false for heat treatment processes?
- Published on 11 Sep 15

a. Martempering process is designed to overcome limitations of quenching
b. Pearlite is obtained as the final phase in martempering process
c. Water is used as quenching medium in Jominy end quench test
d. All of the above

ANSWER: Pearlite is obtained as the final phase in martempering process

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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 austenitisation 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.

    - Pearlite is obtained by the transformation of austenite.

    - Water or brine quickly cool than other mediums such as oil or air. Quenching medium provides faster cooling rate than critical cooling rate and prevents transformation of austenite into other phases. Jominy end quench test is used to measure hardenability.

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