Question

Stepped quenching process is also called as:

• A. Austempering
• B. Self tempering
• C. Martempering
• D. Spray quenching

Hint:

In \textbf{martempering}, steel is quenched just above Ms, held, then cooled — reducing cracking and distortion.

Answer 1

The Correct Option is C

Step 1: What is Stepped Quenching?
Stepped quenching, or martempering, is a heat treatment process where: - The steel is heated above the austenitizing temperature, - Then quenched rapidly to a temperature just above the martensite start (Ms) temperature, - Held isothermally to equalize temperature throughout the part, - Finally, cooled in air to form martensite. Step 2: Purpose of Martempering
This technique: - Reduces internal stresses and distortion, - Avoids cracking in hardened parts, - Is especially useful for thick sections. Step 3: Distinguishing from Other Options
- Austempering: Leads to bainite formation, not martensite. - Self tempering: A general term, not a controlled process. - Spray quenching: A method of cooling, not a specific stepped process. Conclusion: The stepped quenching process is technically and correctly referred to as martempering.