Q5: Give reason for the followings:1-Toughness is reducing when some alloy steels are tempered at 550-650°C.2-Sub-zero treatment is most extensively used for carburized steels, especially alloy steels.3-Recrystallization temperature increases with decreasing the percentage of prior cold work.4-There is a limit to the overall size of the part in conventional hardening process.5-The movement of the interface in the recrystallisation and grain growth are different.

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Q5: Give reason for the followings: 1-Toughness is reducing when some alloy steels are tempered at 550-650°C.

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter2: Measurement, Materials, And Safety

Section2.7: Heat Treatment Of Metals

Problem 8RQ: After hardening, steel is very hard and brittle. What operation is usually performed to reduce...

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Q5: Give reason for the followings:
1-Toughness is reducing when some alloy steels are tempered at 550-650°C.
2-Sub-zero treatment is most extensively used for carburized steels, especially alloy steels.
3-Recrystallization temperature increases with decreasing the percentage of prior cold work.
4-There is a limit to the overall size of the part in conventional hardening process.
5-The movement of the interface in the recrystallisation and grain growth are different.

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