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DUCTILE – BRITTLE
TRANSITION TEST
PROGRAMME
PURPOSE AND SCOPE.

To establish a Hounsefield Impact Machine Test
Procedure.

This procedure will determine the use of the machine
when conducting Ductile-Brittle Transition Tests.

The programme will determine safety issues related to
the test programme.
Hounsefield Impact Machine
Test Procedures
1.
2.
3.
4.
5.
6.
7.
8.
9.
Raise the test-piece pendulum to the lock-in position to the
right of the base.
Raise the hammer pendulum to the lock-in position to the left
of the base.
Set the release mechanism lever to the lock-in position.
Set the dial to zero on the scale.
Place the test-piece in the test-piece holder with the notch
positioned with the lock-in bar.
Release the release mechanism lever to activate the test.
Record the energy absorbed in N/m from the scale on the
dial.
Eject the fractured test-piece and determine the fracture
appearance.
Unlock the test machine.
Microsections of received bar

Carbon Steel

Lateral view

Transverse view

Images to follow
Heat Treatment of received bar



0.1% Carbon Steel
Case Hardening
At 930 oC
For 20 minutes
Water Quenched
Chemical Composition:
……..
Microsections of
Heat Treated Material: 1
Normalised @ 900 0c
longitudinal
x 400
Normalised @ 900 0c
transverse
x 400
edge of sample
Microsections of
Heat Treated Material: 2
Normalised @ 900 0c
transverse
x 400
mid T of sample
Normalised @ 900 0c
transverse
x 400
centre of sample
Sample Preparation

Impact test pieces
with Notch
Sample Temperatures: 1





Nitrogen at -156 oC
Nitrogen at -25oC
Ice Water at 2.5 oC
Boiling Water at 100 oC
Oven at 300oC
Sample Temperatures: 2

Record temperature
Handling

Health and Safety Issues

Leave at target
temperature for
7 minutes

Retrieve sample
using tongs
Test Procedure 1




Raise the test-piece
pendulum to the lock-in
position to the right of the
base.
Raise the hammer pendulum
to the lock-in position to the
left of the base.
Set the release mechanism
lever to the lock-in position.
Set the dial to zero on the
scale.
Test Procedure 2

Place the test-piece in
the test-piece holder
with the notch
positioned with the
lock-in bar.
Test Procedure 3

Release the release
mechanism lever to
activate the test.
Test Procedure 4

Record the energy
absorbed in N/m from
the scale on the dial.
Test Procedure 5

Eject the fractured testpiece and determine the
fracture appearance.

Unlock the test machine.
Results
90

Example of Graph
80
70
60
50
Sample 1
Sample 2
Sample 3
40
30
20
10
0
N/M
Microsections of Fracture

Observe microphotograph.
Conclusions

Compare and Contrast Results

Compare with Predicted Results

Outcomes

Recommendations
Test Procedure Video
Impact2.mpg 35 Seconds 5.5 MB MPEG1