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topic 5477

Hydrogen Embrittlement ASTM F519


(2000)

Q. In the 7.2.6 section of ASTM F519 [link by ed. to spec at TechStreet] -97, it is written:"... the notch shall not be shot peened or receive any blasting / mechanical cleaning operation after the notch is ground to size".

...and in section 3.1 "unstressed specimen are cleaned... in accordance with the plating specification ...qualified"

Do I have to blast my test specimen (for cleaning it as my production is) before plating it?
Which conditions do I have to use for baking it (the production one or those who are usually used for E4340)? Thanks! PS: Unfortunately have a lot of questions about ASTM F519.

Bernard PRIGENT
- France


(2000)

A. Bernie..

Most of the OEM's in the US (Sikorsky Aircraft, PWA etc) are holding to the NO BLAST rule. Although you may be cleaning production parts by blasting , it is roundabout inferred that the notched test specimen is a capability test for your plating tank, not necessarily qualification for each and every different method of cleaning and plating. Mind you, if the only method you use is to mechanically clean you may want to clarify with your prime contractor. Blasting the surface does affect the specimens ability to resist embrittlement and can result in error. I have worked with some folks that have determined this to be true and is the basis for the addition of the NO BLAST revision of ASTM f 519. The baking requirements for the notched specimen should be performed in accordance with the plating specification (QQ-P-416 [link by ed. to spec at Defense Logistics Agency, dla.mil] , AMS2400, etc.).

Tim Martin
plating shop - Springfield, Massachusetts



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