What does primary creep in creep curve indicate? - Material Science

Q.  What does primary creep in creep curve indicate?
- Published on 06 Aug 15

a. Due to down deformation, resistance of metal increases
b. Due to down deformation, resistance of metal decreases
c. It represents high strain rate
d. It represents creep at constant rate

ANSWER: Due to down deformation, resistance of metal increases

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    Discussion

  • Sravanthi   -Posted on 06 Oct 15
    Slow plastic deformation occurring under constant stresses at high temperatures for long duration of time is called as creep test.

    The results of creep test method are obtained by plotting a graph between creep strain and time consumed. It is divided into primary creep, secondary creep and tertiary creep.

    Primary creep represents transient stage. It is the stage in which resistance of metal increases due to down deformation and in given time it forms part of total extension reached.

    Balance between strain hardening and recovery is the result obtained in secondary creep.

    In tertiary creep stage, the rate of extension is high and finally leads to fracture. If tertiary creep is prolonged for a longer time, grain coarsening of metals occurs.

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