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Laboratory Session III: Cold Work of Metals

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Autor: Sophia A. Tsipas

AIM

To study the effect of cold working and re-crystallization process in the mechanical and electrical properties of a brass.

 

MATERIAL

  • Brass samples
  • Metal rolling machine
  • Oven
  • Hardness tester
  • Optical microscope
  • Conductivity meter

 

EXPERIMENTAL method

a) Measure the hardness and conductivity of the brass probed in the initial annealed state (sample 1).
b) Afterwards, reduced the section of three of the probes (samples 2,3 and 4) by 10, 30 and 50% respectively and measuring in each case hardness and conductivity .

c) The last somples (sample 5) has been rolled to 50%, annealed in the oven at 650 ºC for 10 minutes and cooled down slowly in the oven. Measure its hardness and conductivity.

 

Probe
1
2
3
4
5
Reduction % 
0
10
30
50
50 +annealing
(HRB)Hardness
 
 
 
 
 
Electrical conductivity (MS/m)
 
 
 
 
 

 

d)  Metallographic inspection.  Observe under the optical microscope the prepared brass spacimens with different rolling amount.