I have reason to test an Aluminium alloy, grade LM6 as cast. No originally we took test bars from the casting and these were lower than the limits laid down of 80n/mm2 proof, 190 tensile stress 7% elongation.
we originally though that due to the fact that the material was removed from the casting, various defect contributed to the lower values 174 in tensile strength.
next we cast 4 seperately cast test bars in a stell die, and allowed them to cool dow naturally. We then put these bars through x-ray and showed up a spotless, and free from defects, but again they returned values of only 160 tensile strength.
This has got me stumped as to why we are getting consistant results lower than we normally should. Any ideas?
for our american friends, lm6 is equiv to 413.2 i think
Cu 0.1
mg 0.1
si 10.5 -13
fe - 0.5
mn - 0.5
ni - 0.1
zn 0.1
we originally though that due to the fact that the material was removed from the casting, various defect contributed to the lower values 174 in tensile strength.
next we cast 4 seperately cast test bars in a stell die, and allowed them to cool dow naturally. We then put these bars through x-ray and showed up a spotless, and free from defects, but again they returned values of only 160 tensile strength.
This has got me stumped as to why we are getting consistant results lower than we normally should. Any ideas?
for our american friends, lm6 is equiv to 413.2 i think
Cu 0.1
mg 0.1
si 10.5 -13
fe - 0.5
mn - 0.5
ni - 0.1
zn 0.1