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Which of the following is an application for flame hardening?

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in Engineering Material & Metallurgy by (773k points)
Which of the following is an application for flame hardening?

(a) Distortion occurs

(b) Expensive equipment

(c) Suitable for larger quantities

(d) Overheating causes cracks

The question was asked in a national level competition.

This question is from Selective Hardening topic in chapter Heat Treatment of Engineering Material & Metallurgy

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Right option is (d) Overheating causes cracks

Easy explanation: The advantage of flame hardening lies in the fact that there is no distortion of workpiece since only a small section of the steel is heated. This process is efficient and economical as the cost of equipment is low, thereby making it more suitable for small quantities. It has a disadvantage that overheating of the steel may cause cracks.

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