ASTM E407 – 07 PDF

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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ASTM E407-07 Standard Practice for Microetching Metals and Alloys

Excellent grain boundary etch for ferritic stainless steels. Film on etched aluminum bronze removed by No. Helps to chemically polish. This problem is very common when the specimen or mounting media contain porosity and when the mounting material such as Bakelite does not bond tightly to the specimen resulting in seepage along the edges of the specimen.

A number in parentheses indicates the year of last reapproval. Distilled water is then slowly added to the wheel and polishing continued until the surface is bright. Pre-etch steel specimens with nital before tinting the MnS add 0.

H2SO4 may be increased to 20 mL for deeper attack.

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. Additionally, one can contact the glove manufacturer or, if available, consult the manufacturers glove chart. A selection of useful books on this subject is given in Refs. Electrolytic at 6 V for few seconds. NOTE 2—Electrolytic etchants are italicized.

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Mix in order given. Buying HF at the lowest useable concentration will signi? Stains carbides dark, ferrite yellow, sigma blue. Additionally, it is recommended that a calcium gluconate 2 cream or other appropriate HF neutralizing agent be available for use if direct skin contact of the etchant occurs.

Vary composition of reagent and aging of reagent after mixing to suit alloy. Can increase HNO3 to increase strength. Continued Uses general structure grain boundaries general structure etch-polishing for viewing grains with asttm light Etchants66,aatm,a a Osmium Base: Immerse or swab few seconds at a time until desired results are obtained.

In all cases, extreme care should be taken to remove all traces of the etchant by thorough washing and complete drying of the specimen before placing it on the microscope stage.

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

Electrolytic at 8—10 V 0. Follow with water rinse, alcohol rinse, and dry. For highly corrosion-resistant alloys, use 20—30 mL HCl. Properly discard when dark yellow.

[PDF] ASTM E Standard Practice for Microetching Metals and Alloys – Free Download PDF

Total etching time 3 min 50 mL Carbitol diethylene glycol monoethyl with agitation. Swab or immerse few seconds to a minute. Start at 3 V dc. Use fresh—immerse few seconds to a minute. Colors phosphides in cast iron. Use optional ingredients to improve coloration, if needed. The deposition is conducted inside a vacuum evaporator of the type used to prepare replicas for electron microscopy. For each metal and alloy, one or more etchant numbers and their corresponding use is indicated.

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Swab 1—3 s for F and T6, 10 s for T4 and O temper. Observe printed cautions on reagent bottles. Rinse with methanol and blow dry.

Immerse to 1 min. Add nitric acid to lower the pH to 2. Pure Al Etchants Uses 1a, 2, 3 4, 5 1b 1a, 3, 2 4, 5 6, 7 3, 2, 1a 8a, 6, 7 3, 1a 4, 5 8a, 6, 7 3, 1a 3, 1a, 2, 6, 8a 4, 5 3, 1a, 2, 6, 8a, 4, 5 1a, 2, 7, 6, 8a 3, 1a, 2 4, 5 3b, 6 general structure grain structure under polarized light grain boundaries and slip lines general structure grain structure under polarized light phase identi?

For more corrosion resistant alloys. Slowly evaporate the lumps and observe the surface of the specimen. Immerse 30 s—3 min. Warm specimen in boiling water prior to immersion for 10 to s.

Adding a wetting agent such as zepherin chloride will increase response. Swab for 5—20 s. Stains carbides and sigma. For etch-polishing, use shorter times. Swab until stain is removed. Better results are sometimes obtained by?

Use crossed polarized 4e07 and sensitive tint to improve coloration. Must be used fresh. Mix equal volumes of Solutions A and B just before use.