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Subcritical annealing is another name for ____________

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Subcritical annealing is another name for ____________

(a) Process annealing

(b) Stress relief annealing

(c) Recrystallization annealing

(d) Spheroidise annealing

I had been asked this question in an interview for job.

Asked question is from Annealing topic in section Heat Treatment of Engineering Material & Metallurgy

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The correct answer is (a) Process annealing

The explanation is: Process annealed steels are heated around 550-650oC, held for some time for softening, then cooled at any desired rate. This process induces a single phase morphology. This process is otherwise known as subcritical annealing.

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