Given an iron-carbon alloy that is heated at 770°C and has been held at this temperature long enough to have achieved a complete and

Welding: Principles and Applications (MindTap Course List)
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Chapter26: Welding Metallurgy
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Problem 12R: What is a eutectic composition?
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Mohamad Zbib:
Given an iron-carbon alloy that is
heated at 770°C and has been held
at this temperature long enough to
have achieved a complete and
homogeneous austenitic structure.
What would be the microstructure,
and the percentage, in each of the
following cases?
(a) Cool a sample rapidly to 600°C
and hold for 5s.
(b) Cool another sample rapidly to
500°C, hold for 100s, and then
quench to 100°C.
(c) Cool another sample rapidly to
300°C, hold for 10s, and then
quench it rapidly to room
temperature.
(d) Quench another sample to
100°C within less than a second.
(e) Reheat the sample from part (c)
to 300°C for an hour.
Transcribed Image Text:Mohamad Zbib: Given an iron-carbon alloy that is heated at 770°C and has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. What would be the microstructure, and the percentage, in each of the following cases? (a) Cool a sample rapidly to 600°C and hold for 5s. (b) Cool another sample rapidly to 500°C, hold for 100s, and then quench to 100°C. (c) Cool another sample rapidly to 300°C, hold for 10s, and then quench it rapidly to room temperature. (d) Quench another sample to 100°C within less than a second. (e) Reheat the sample from part (c) to 300°C for an hour.
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