a: Quench to from 800oC to 350oC and hold for 102 seconds:b: Quench the alloy to room temperaturec: Reheat the alloy to 700oC and hold for 105 seconds Part 1: Identify the microstructure formed in the steel alloy based on the TTT-Diagram aftereach heat treatment step:800Austenite (stable)T.T(°C)A600B- - --400A100%50%0%M +A50%20090%M+AM +Ato10time (s)1010100%

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Answered: Quench to from 800oC to 350oC and hold…

Quench to from 800oC to 350oC and hold for 102 seconds: b: Quench the alloy to room temperature c: Reheat the alloy to 700oC and hold for 105 seconds

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 2RQ: Direct hardening can be performed on steel containing at least________ carbon.

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Concept explainers

Strengthening of Alloys

Strengthening of the alloys is required as metals become weak due to various lattice defects, metal bonding phenomena. The strength of the metals is not enough for any mechanical work. The internal dislocations of any metals arise due to forming processes. Due to the movement of these dislocations, the metals are plastically deformed.

Question

a: Quench to from 800oC to 350oC and hold for 102 seconds:
b: Quench the alloy to room temperature
c: Reheat the alloy to 700oC and hold for 105 seconds

Part 1: Identify the microstructure formed in the steel alloy based on the TTT-Diagram after
each heat treatment step:
800
Austenite (stable)
T.
T(°C)
A
600
B
- - --
400
A
100%
50%
0%
M +A
50%
200
90%
M+A
M +A
to
10
time (s)
10
10
10
0%

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