Find the most up-to-date version of ASTM E at Engineering Macroetching, also known as deep etching, involves etching specimens prepared with a suitable acid or reagent for macrostructural examination. Contact us. Purchase your copy of ASTM E – 17 as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available.
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The method is limited in application to bars, billets, blooms, and forgings of carbon and low alloy steels. Remove the smut that forms on the specimen surface by scrubbing the surface with a stiff brush under hot running water. There were no books found for the applied search filters. Dark center is solid material and should not be confused with center unsoundness.
Etching times with cold solutions see 5.
Adjunct to E Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings – ADJE
Sufficient torch cut material should be removed by cold cutting to eliminate the thermal effects of torch cutting. When etching is completed, remove the specimen from the solution, taking care not to mar the specimen surface.
The name implies that the etched surface is examined visually, or at low magni? A freshly made solution is necessary for best results. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at astn address shown below.
They are usually found in continuously cast or bottom poured products. Development of grain flow in a forged part or fastener, which is a critical property for the integrity of the forging. The reagent should be used under a fume hood, or some other means asttm carrying off the corrosive fumes must be provided.
Disks may be faced on a lathe or a shaper. Some of the conditions are represented by sketches drawn on the photomacrographs. Small pieces may be etched in glass or porcelain vessels of the types commonly available in laboratories.
Resins in asm used to make tanks sometimes act as uncertain and uneven inhibitors resulting in unsatisfactorily etched disks. In ingot cast product, it is sometimes called ingotism or ingot pattern.
Splash is normally associated with molten steel which solidi? Precision and Bias Inspection is most effective when done while the piece is still wet.
ASTM E381 – 17
Photographs for Rating Macroetched Steel 3 plates 3 3. The method employs the action of an acid or other corrosive agent to develop the macrostructural characteristics of a suitably prepared specimen. Examination of Continuously Cast Product Specimens Compositional differences also in?
Go to Navigation Go to Content. In most cases, 15 to 30 min will be sufficient for hot-acid etching. The solution may be heated without serious change in concentration. A number in parentheses indicates the year of last reapproval.
Overetching can lead to misinterpretation. These may be located anywhere from the near surface region of the product to the center of the product, depending on the source and severity of the condition. Study of weld structures, definition of weld penetration, dilution of filler metal by base metals, entrapment of flux, porosity, and cracks in weld and heat affect zones, etc.
ASTM E – 17 Standard Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
The usual procedure is to take a roughing cut, then a? Examination and rating of specimens shall be in accordance with Sections 10 and 11 of this E standard. Are you sure you want to empty the cart?
The etching solution should be clear and free e81 scum. Macroetching, also known as deep etching, involves etching specimens prepared with a suitable acid or reagent for macrostructural examination at low magnifications and rating by a grades series of photographs showing the incidence of certain conditions such as: The etching solution may be reused if it has not become excessively contaminated or weakened.