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Surface Heat Treatments of Steels

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Questions and Answers

What is the purpose of forming 'hard and wear resistant martensite' in the outer case of the components?

To reduce the overall strength of the components

To increase the overall ductility of the components

To improve the inner layer composition of the components

To enhance the surface hardness and wear resistance (correct)

Why is 'conventional through hardening' not effective for these components?

It increases the overall ductility of the components

It causes excessive softening of the outer surface

It does not produce the desired properties throughout the cross-section (correct)

It results in chemical reactions within the core

What type of steel is surface hardening applicable to?

Tool steels

Low carbon steels

High carbon steels and alloy steels (> 0.4% carbon) (correct)

Stainless steels

What is formed in the core during the process of flame hardening?

Pearlite + Ferrite Signup and view all the answers

What type of reactions occur during surface hardening?

No reactions occur Signup and view all the answers

Why is conventional through hardening not effective for components requiring hard and wear resistant martensite in the outer case and soft and ductile core?

It produces the component with the same properties throughout the cross section Signup and view all the answers

What is formed in the outer surface during the process of flame hardening?

Martensite Signup and view all the answers

Which type of steel is surface hardening applicable to?

High carbon steels (> 0.6% carbon) Signup and view all the answers

What occurs in the core during the process of flame hardening?

Pearlite + Ferrite is formed Signup and view all the answers

What makes 'high carbon steels' and 'alloy steels' suitable for surface hardening?

Their ability to form martensite upon rapid quenching Signup and view all the answers