Refer to table 2 for "Mechanical propperty limits for Die Forgings" of ASTM B247. The note with superscript 'C' says:
C These values apply to standard specimens. For the heat-treatable alloys the thicknesses shown are the maximum thickness at time of heat treatment for which the indicated...
Thanks mrfailure. U r right. We have an optical microscope and micro-hardness tester avaiable with us, which we have purchased recently. It would have been helpful, if somebody could share the macrographs and micrographs of Al-2024 as cast, cast and homogenized, as forged, Forged and annealed...
We have received a block of 2024 for heat treatment to T4 temper. Its size was 200x 200x 300 mm approx. Customer stated that it is "forged". It was Solution treated and then aged. After ageing the block was split into two halves(crack was not visible at the stage of quenching). The failure...
Thanks tbuelna for the clarification. These are total 18 jobs only. Please let me know the suitable verification testing, And supporting standard/source literature for this verification, if any.
Check the mill test certificate. Identify the alloying elements heavier than 21 atomic number. Do a little surface preparation on the structural members by grinding and prepare a clean surface. Perform PMI (Positive metal identification ) by portable XRF analyzer.
I've replied in context of...
High strength low alloy steels Jobs were quenched and tempered to a hardness of 40-41 HRC. Subsequently they were cleaned by degreasing and pickling, then oxidized for corrosion protection. After the surface treatment they were supposed to be baked as soon as possible as per MIL-DTL-13924D...
sorry for that, all readers; u r right mrfailure.
Hardness is a surface property then y section thickness should be limited to ensure uniform hardness (as its the only property given in this table). seconldy, martensitic steels have good hardenability as well. So they are expected to...
MagBen, please see, that legend (A) is marked with the column "type" and the note with legend is :
[highlight #EDD400](A) Samples for testing shall be in the form of a section not exceeding 3⁄8 in. (9.50
mm) in thickness[/highlight].
I've ASTM A276-04 available with me.
To evaluate the response to heat treatment, ASTM A276 recommends to measure hardness on samples with a minimum section of 9.5 mm. As hardness can be measured on lower section thickness reliably as well, then why section thickness is restricted to a minimum of 9.5mm by specification?
