Question

How does heating for hypereutectoid steels differ from hypoeutectoid steels?

(a) Heated 30-60^oC above A1 line

(b) Heated 30-60^oC below A1 line

(c) Heated 30-60^oC below A2 line

(d) Heated 30-60^oC below A3 line

I had been asked this question in a national level competition.

I'd like to ask this question from Annealing in portion Heat Treatment of Engineering Material & Metallurgy

Answer 1

Right option is (a) Heated 30-60^oC above A1 line

To explain: Hypoeutectoid steels are heated above the A3 line and then cooled in the furnace. On the other hand, hypereutectoid steels are heated 30-60^oC above the A1 line and then cooled similar to hypoeutectoid steels.