Current Attempt in Progress Using the Animated Figure 10.40, the isothermal transformation diagram for a 0.45 wt% C steel alloy, specify the nature of the final microstructure (in terms of the microconstituents present) of a small specimen that has been subjected to the following temperature treatments. In each case assume that the specimen begins at 845 °C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. a) Rapidly cool to 700 degrees C, hold for 100,000 s, then quench to room temperature.

Current Attempt in Progress Using the Animated Figure 10.40, the isothermal transformation diagram for a 0.45 wt% C steel alloy, specify the nature of the final microstructure (in terms of the microconstituents present) of a small specimen that has been subjected to the following temperature treatments. In each case assume that the specimen begins at 845 °C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. a) Rapidly cool to 700 degrees C, hold for 100,000 s, then quench to room temperature.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Alloys

An alloy is an admixture of two or more metals or a metal and a non-metal. Since ancient times, man has been using alloys. Alloying helps to retain the properties of the parent matter, such as hardness, strength, toughness, ductility and is corrosion-resistant. Copper alloys such as brass have antimicrobial properties that help to fight against (Coronavirus disease 2019) COVID-19 and other hospital-acquired infections. Some common alloys are brass, bronze, solder steel, etc. Most alloys have a lower melting point than their constituents. This is due to the presence of a nonmetal as one of the constituents that behaves as an impurity and restricts the raise of melting point.

Question

Time = 1 · 10E-1 s
Temperature = 0 °C
Temperature = 32 °F
%3D
900
1600
800
A +F
1400
A
700
1200
A + P
600
В
1000
500
FA+B
800
50%
400
M (start)
M (50%)
600
300
M (90%)
200
400
100
200
이1
1
10
102
103
104
105
Time (s)
Temperature (°C)
Temperature (°F)

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Current Attempt in Progress
Using the Animated Figure 10.40, the isothermal transformation diagram for a 0.45 wt% C steel alloy, specify the nature of the final
microstructure (in terms of the microconstituents present) of a small specimen that has been subjected to the following
temperature treatments. In each case assume that the specimen begins at 845 °C and that it has been held at this temperature long
enough to have achieved a complete and homogeneous austenitic structure.
a) Rapidly cool to 700 degrees C, hold for 100,000 s, then quench to room temperature.
b) Rapidly cool to 450 degrees C, hold for 10 s, then quench to room temperature.
proeutectoid ferrite + pearlite
proeutectoid ferrite + martensite
proeutectoid ferrite + pearlite + martensite
eT
proeutectoid ferrite + pearlite + bainite + martensite
all spheroidite
Save
all bainite
Attempts: 0 of 5 used
Submit Answer
all martensite
bainite + martensite

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