DUCTILE – BRITTLE TRANSITION TEST PROGRAMME

PURPOSE AND SCOPE. To establish a Hounsefield Impact Machine Test Procedure. To establish a Hounsefield Impact Machine Test Procedure. This procedure will determine the use of the machine when conducting Ductile-Brittle Transition Tests. 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. The programme will determine safety issues related to the test programme.

Hounsefield Impact Machine Test Procedures 1. Raise the test-piece pendulum to the lock-in position to the right of the base. 2. Raise the hammer pendulum to the lock-in position to the left of the base. 3. Set the release mechanism lever to the lock-in position. 4. Set the dial to zero on the scale. 5. Place the test-piece in the test-piece holder with the notch positioned with the lock-in bar. 6. Release the release mechanism lever to activate the test. 7. Record the energy absorbed in N/m from the scale on the dial. 8. Eject the fractured test-piece and determine the fracture appearance. 9. Unlock the test machine.

Microsections of received bar Carbon Steel Carbon Steel Lateral view Lateral view Transverse view Transverse view Images to follow Images to follow

Heat Treatment of received bar 0.1% Carbon Steel 0.1% Carbon Steel Case Hardening Case Hardening At 930 o C For 20 minutes Water Quenched  Chemical Composition: ……..

Microsections of Heat Treated Material: c longitudinal x c transverse x 400 edge of sample

Microsections of Heat Treated Material: c transverse x 400 mid T of sample c transverse x 400 centre of sample

Sample Preparation Impact test pieces Impact test pieces with Notch

Sample Temperatures: 1 Nitrogen at -156 o C Nitrogen at -156 o C Nitrogen at -25 o C Nitrogen at -25 o C Ice Water at 2.5 o C Ice Water at 2.5 o C Boiling Water at 100 o C Boiling Water at 100 o C Oven at 300 o C Oven at 300 o C

Sample Temperatures: 2 Record temperature Record temperature

Handling Health and Safety Issues Health and Safety Issues Leave at target temperature for Leave at target temperature for 7 minutes Retrieve sample 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 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. 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 release mechanism lever to the lock-in position. Set the dial to zero on the scale. 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. 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. 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. Record the energy absorbed in N/m from the scale on the dial.

Test Procedure 5 Eject the fractured test- piece and determine the fracture appearance. Eject the fractured test- piece and determine the fracture appearance. Unlock the test machine. Unlock the test machine.

Results Example of Graph Example of Graph

Microsections of Fracture Observe micro- photograph. Observe micro- photograph.

Conclusions Compare and Contrast Results Compare and Contrast Results Compare with Predicted Results Compare with Predicted Results Outcomes Outcomes Recommendations Recommendations

Test Procedure Video Impact2.mpg 35 Seconds 5.5 MB MPEG1