Question

Statement (I): Carburizing is used for machine elements which have to have a wear resistant working surface.

Statement (II): The compositions of surface layers are changed in carburizing.

1. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I)
3. Statement (I) is true but Statement (II) is false
4. Statement (I) is false but Statement (II) is true

Answer 1

Correct Answer - Option 1 : Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

Concept:

Carburizing

• Carburizing is one of the most widely used surface hardening processes.
• The process involves diffusing carbon into low carbon steel to form a high carbon steel surface.
• The Carburizing process is also referred to as case hardening or case carburizing process.
• It is a heat treatment process that produces a surface that is resistant to wear while maintaining the toughness and strength of the core.
• High Carbon Steels have higher strength and hardness.
• Low carbon steels have higher toughness.
• Increasing carbon only on the surface of low carbon steel can give a hard surface and tough core.​