More phase diagram content

Question 1

Recyryzatlazation Annealing

Answer 1

This heat treatment removes the results of the heavy plastic deformation of highly shaped cold formed parts and promotes the formation of new grains without phse changes

Question 2

Sperodizing

Answer 2

Heat Treatment Proccess that involves a slow cooling procces to convert grains into spherical stucture.

Question 3

difference between annealing and normalizing

Answer 3

annealing cooling occurs in the furnace. Normalizing outside furnace.

Question 4

at 0.85 % c

Answer 4

100 % Austenite then changes

Question 5

Homogenizing

Answer 5

the procces to remove chemical segregation in metals

Question 6

Euctetoid point other name

Answer 6

split from lower and upper transformation.

Question 7

above lower transformation line

Answer 7

Austnetite

Question 8

below the Lower transformation line

Answer 8

no Austenite.

Question 9

The upper transformation line ranges from

Answer 9

Eutectoid ( 728) to 923 left or ecectecti right (1147)

Question 10

Martensite and Bainite phases are mostly determined by

Answer 10

cooling rate rather than temperature

Question 11

quenching

Answer 11

heat at red hot and slow cooled down. phase is martesnite

Question 12

faster cooling rate

Answer 12

higher strenght and low ductility

Question 13

Between the Upper and Lower transformation line

Answer 13

Partial Austenite.

Question 14

Fine pearlite

Answer 14

Pearlite mix between pearlite and cemenite.

Question 15

Coarse cementite

Answer 15

Upper region of s. mix of ferrite, pealrite, and cemenite

Question 16

Martensite

Answer 16

The lowest region of s. “ fast cooling rate”

Question 17

Bainite

Question 18

Timeline C location

Answer 18

Touches the “nose” of the s. Fine Pearlite

Question 19

Timeling A

Answer 19

Straight line down. Martensite. Fast cooling

Question 20

Timeline B loc

Answer 20

Striahgt line on other side of S. Coarse Pealrite. “ Slow cooling rate”

Question 21

Timeline E.

Answer 21

Goes to Austneite and Pearlite mix. then goes down to room temp.

Question 22

Timeline D

Answer 22

Goes to Bainite.

Question 23

The lower transformation curve in a it/tt diagram is the

Answer 23

left curve of S

Question 24

The upper transformation curve in an it/tt diagram is the

Answer 24

right curve of S

Question 25

Cooling rate of metals

Answer 25

slow pealrite. Bainite. Magnestite

Question 26

Why coarse perlite rite of s different between fine pearlite

Answer 26

Coarse has larger grain size. And thus slower cooling rate

Question 27

In an IT/TTT diagram, there must be a different curve for different

Answer 27

C content and for every type of steel

Question 28

IT diagram is useful for

Answer 28

predicting the microstructure of the Metal.

Question 29

Increasing Carbon content for It diagram

Answer 29

Pushes nose to the right

Question 30

Difference between TTT and IT diagram

Answer 30

TTT is cooling at different rates . CTT is for constant rates

Question 31

Why coarse Pearlite is coarse and fine is fine

Answer 31

Formed at lower temperature so lower rate of carbon diffusion.

Question 32

Martempering steps

Answer 32

1. Quenched from austentic temp to martentsite temp. 2. held there. 3. raidly quenched and then immediately rehated to bainite region. 4. held at Bainite 5. cooled to room temp

Question 33

Isothermal QT steps

Answer 33

1. QUenhced down to martensite region. held their for a short time. then reheated to Bainite region/ held a Bainite for longer time. then rapidly cooled to room temp

Question 34

Austempering steps

Answer 34

cooled gently to the bainite region. held their for a while and then cooled up to Martensite.