ASTM E407 – 07 PDF

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Originally approved in Last previous edition approved in as E–99 DOI: /E 2 For referenced ASTM standards. ASTM E()e1. Standard Practice for Microetching Metals and Alloys. standard by ASTM International, 06/01/ View all product details. Determination of Residual Stresses Numerically Obtained in ASTM AH36 Steel Welded by TIG Process. Pablo Batista Guimarães, Paulo.

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Composition Electrolytic at 2—3 V for 2—10 s. Electrolytic at 8—10 V 0. Precaution—Do not boil dry—anhydrous picric acid is unstable and highly explosive. Immerse 10 min or e4407. Add nitric acid to lower the pH to 2. Electrolytic at 15—50 V for 15—60 s. Swab 2 or more minutes for desired surface. Solution composes on standing. Colors phosphides in cast iron. Immerse face up, gently agitate until coloration begins, allow to settle. Use at 1 V dc, s, with stainless cathode; 0.

ASTM E407-07 Standard Practice for Microetching Metals and Alloys

Use optional ingredients to improve coloration, if needed. The HF may be varied to give more or less etching. Etching rate is increased, sensitivity decreased with increased percentage of HNO3. Electrolytic at 6 V for 40 s wstm temperature. Pure Th Th alloys Tin Base: The specimen is examined as polished under polarized light. Electrolytic at 6 V for few seconds.

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Solution good for several days, or longer. Immerse to 1 min. Electrolytic at 3 V for 2—10 s. Adding a wetting agent such as zepherin chloride will increase response.

Swab for 5—20 s. Stop when surface is dark. Remove the specimen from the etchant when the surface is colored violet, rinse and dry. It will also react with alkaline materials including plaster and concrete to form explosive compounds.

Better results are sometimes obtained by? 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 the address shown below.

ASTM E – 07()e1 Standard Practice for Microetching Metals and Alloys

Warm specimen in boiling water prior to immersion for 10 to s. Pure Ni and high Ni alloys, 47, 25,31c 38,50, 50,89,50, 83, 98, 13a 38,50, 25,47, 48b, 94,f407 50, 83, astn,74e, 25, 74e, 50, 94,12, 87, 89,25, 94, 13a 19b,22a general structure grain boundary sul? See Guide E on Metallographic Laboratory Safety for additional information on safety precautions for electrolytes containing perchloric acid.

Continued Procedure Use a certi?

ASTM E Standard Practice for Microetching Metals and Alloys_百度文库

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Slowly evaporate the lumps and observe the surface of the specimen. Observe printed cautions on reagent bottles. Phases can be colored by Nos. The numbers of electrolytic etchants are italicized to differentiate them from nonelectrolytic etchants.

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Properly discard when solution turns dark yellow. Stains sigma and chi yellow to red brown, ferrite gray to blue gray, carbides barely touched, austenite not touched.

Swab gently 5—15 s. Pure Cu 26, 27, 28, 29, 30, 31d, 32, 33, 34b, 35, 36, 37, 38, 39, 40, 41, 42, 8b,43, 28 44, 31d, 34b, 35, 36, 37, 38, 39, 40, 45, 46, 41, 45 41 41 34, 47, 48, 40, 49, 50 41 51, 52 8b general structure chemical polish and etch general structure general general general general general general structure structure structure structure structure structure Cu-Al aluminum bronze Cu-Be Cu-Cr Cu-Mn Cu-Ni Cu-Si Cu-Sn tin bronze Admiralty metal Gilding metal Cartridge brass Free-cutting brass Nickel silver Cu alloys general structure 31d, 32, 33, 41, 42, 49 26, 27, 28, 29, 30, 44, 41, 31d, 32, 33, 34b, 35, 36, 37, 38, 39,53, 43, 28, 49 42, 49, 54 55, 56 general structure general structure chemical polish and etch darkens beta in alpha-beta brass etching of cold worked brass general structure Dysprosium Base: Swab 3—10 s or immerse to 2 min.

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