[PDF] [PDF] Iron/Carbon Phase Diagram

Martensite (non equilibrium BCT phase from quench of γ) BCC Orthorhombic Iron/Carbon Phase Diagram Iron shows a eutectic with Carbon allowing for a 



Previous PDF Next PDF





[PDF] IRON –CARBON PHASE DIAGRAM

Definition of structures: Various phases that appear on the Iron- Carbon equilibrium phase diagram are as under: • Austenite • Ferrite • Pearlite • Cementite



The C-Fe (carbon-iron) system

Weighk Percent Carbon 1 Assessed Fe-C phase diagram from 0 to 25 aL Fe Stable Fe-C (graphite) and metastable Fe-Fe3C (cementite) equilibria



[PDF] The Iron - Iron Carbide (Fe-Fe C) Phase Diagram - Academic Uprm

Phases in Fe–Fe 3 C Phase Diagram ➢ α-ferrite - solid solution of C in BCC Fe • Stable form of iron at room temperature • Transforms to FCC g-austenite at 



[PDF] Iron/Carbon Phase Diagram

Martensite (non equilibrium BCT phase from quench of γ) BCC Orthorhombic Iron/Carbon Phase Diagram Iron shows a eutectic with Carbon allowing for a 



[PDF] Iron–Iron Carbide (Fe–Fe3C) Phase Diagram - NIFFT

The Fe-C phase diagram is a fairly complex one, but we will only consider the steel part of the diagram, up to around 7 carbon Page 2 Phases in Fe–Fe3C 



[PDF] Iron Carbon Phase diagram Questions - NPTEL

Lecture 23-24 : Iron Carbon Phase diagram Questions: 1 FCC is a more close packed structure yet solubility of carbon in austenite which is FCC is higher



[PDF] Phase Diagrams - NPTEL

3) The iron-carbon system, phase transformations 4) Transformation rate effects and TTT diagrams, Microstructure and property changes in iron- carbon system



[PDF] Iron-Carbon Phase Diagram (a review) see Callister Chapter 9

In their simplest form, steels are alloys of Iron (Fe) and Carbon (C) The Fe-C phase diagram is a fairly complex one, but we will only consider the steel part of the 



[PDF] Iron-Carbon Phase Diagram Its defined as:- A map of the

In their simplest form, steels are alloys of Iron (Fe) and Carbon (C) Notes: - This graph, which is known as iron- carbon equilibrium diagram has the following

[PDF] ironport email security

[PDF] ironport email security configuration guide

[PDF] irr sharp el 738f

[PDF] irregular verbs in german pdf

[PDF] irregular verbs pdf with gujarati meaning

[PDF] irregular verbs pdf worksheet

[PDF] irregular verbs with malayalam meaning pdf

[PDF] irregular verbs with pictures pdf

[PDF] irs 1040 form 2018 pdf

[PDF] irs 1040 form 2018 printable

[PDF] irs 1040 form 2019 pdf

[PDF] irs 1099 form 2019

[PDF] irs 1099 hc

[PDF] irs 2019 tax deadline extended

[PDF] irs 2019 tax deadline extension

1

Phase Behavior in Iron/Carbon System

Callister P. 252

Chapter 9

2

Iron Age

1500 to 1000 BC

Iron Ore is extremely common and was used as a fluxing agent in copper smelting from malachite (Copper carbonate) Making an iron rich slag.

Melting point is 1538°C

3 Copper Slag contains some reduced iron as sponge iron.

Hammering compacts the sponge producing wrought iron.Iron Ore was used as a fluxing agent in copper smelting from malachite (Copper carbonate)

Making an iron rich porous slag, sponge iron.

Bronze is harder than pure iron

Iron is also subject to corrosion

So pure iron is not an advancement

over Bronze 4 Hittites (Turkey) repeatedly heated bloom in charcoal furnaces at 1200°C

Followed by working with a hammer

CO lead to the diffusion of C into the iron at the surface

Case Hardened Steel

Even a fraction of a percent of carbon

can have a dramatic effect on hardness

Hittites needed to beat bronze

in terms of hardness so their weapons could pierce bronze shields

Quenching also hardened steel (Martensite)

(followed by tempering (heating)) 5 FCC Martensite (non equilibrium BCT phase from quench of BCC

OrthorhombicIron/Carbon Phase Diagram

Iron shows a eutectic with Carbon

allowing for a lower melting alloy

Body Centered Tetragonal

6 7 8

Carbon content can be reduced

by reaction with oxygen and stirring 9 10

Eutectoid Steel Pearlite

11

Time-Temperature-Transformation Diagram

12

Time-Temperature-Transformation Diagram

Just below 727°C

Thermodynamics drive is low

so time is long 13

Time-Temperature-Transformation Diagram

Well below 727°C

Diffusion is slow

so time is long 14

Time-Temperature-Transformation Diagram

At very deep quenches

Diffusionless Transformation

Occurs: Martinsitic

Transformation

15

Hypoeutectoid Steel

16

Hypoeutectoid Steel

17

Hypoeutectoid Steel

18

Hypoeutectoid Steel

19 20

Hypereutectoid Steel

21
22

Kinetics of Phase Growth

23
24

Heat Treatment of Steel

Spheroidizing

: Spheroidite forms when carbon steel is heated to approximately 700
°C for over 30 hours. Spheroidite can form at lower temperatures but the time needed drastically increases, as this is a diffusion-controlled process. The result is a structure of rods or spheres of cementite within primary structure (f errite or pearlite, depending on which side of the eutectoid you are on). The purpose is to soften higher carbon steels and allow more formability. This is the softest and most ductile form of steel.

Process annealing

: A process used to relieve stress in a cold-worked carbon steel with less than 0.3 wt% C. The steel is usually heated up to 550-650

°C for 1

hour, but sometimes temperatures as high as 700

°C.Quench and tempering

: This is the most common heat treatment encountered, because the final properties can be precisely determined by the temper ature and time of the tempering. Tempering involves reheating quenched steel to a temperature below the eutectoid temperature then cooling. The elevated temperature allows very small amounts of spheroidite to form, which rest ores ductility, but reduces hardness. Actual temperatures and times are carefully chosen for each composition. 25

Martensite

Austinite => Martensite Transformation

FCC => BCT

26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
quotesdbs_dbs17.pdfusesText_23