HKIE Professional Assessment - Materials Discipline Practice Questions - HKIE Professional Assessment - Materials Discipline (Hong Kong Institution Of Engineers) Exam

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High-carbon alloy tool steels often contain significant amounts of retained austenite after quenching to room temperature. What heat treatment or thermal process is performed immediately after quenching to convert retained austenite into martensite?

Sub-zero cryo-treatment (cooling to -78 °C or -196 °C) High-temperature normalizing at 900 °C Isothermal annealing at 700 °C Spheroidizing heat treatment

Correct Answer:

Sub-zero cryo-treatment (cooling to -78 °C or -196 °C)

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