Question

How does the size of the specimen affect the hardness of steel?

(a) Smaller size results are high hardness

(b) Smaller size results in low hardness

(c) Larger size results in high hardness

(d) No change is found

This question was posed to me by my college director while I was bunking the class.

I want to ask this question from Hardening and Hardenability topic in division Heat Treatment of Engineering Material & Metallurgy

Answer 1

The correct choice is (a) Smaller size results are high hardness

Explanation: The size of the specimen also greatly affects the hardness of the steel during the hardening process. As the size of the specimen increases, its hardness decreases. For example, hardness with a 50 mm diameter steel bar will be higher than a similar one of 100 mm diameter.