Question

Which of the following is/are correct regarding creep?

(a) It is the continuous plastic elongation of metal under constant load

(b) It is the high-temperature mechanical effect of a metal

(c) It is the continuous plastic elongation of metal under constant load at high temperature and it can be minimized by the fraction of grain boundaries

(d) It can be minimized by reducing the fraction of grain boundaries

I have been asked this question in exam.

The query is from High Temperature Materials in section High Temperature Corrosion of Corrosion Engineering

Answer 1

The correct option is (c) It is the continuous plastic elongation of metal under constant load at high temperature and it can be minimized by the fraction of grain boundaries

The explanation is: It is defined as the continuous plastic elongation of metal under constant load at high temperatures. Creep rate is then expressed as percent elongation in a given time. It can be minimized by reducing the fraction of grain boundaries.