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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Etching rate is increased, sensitivity decreased with increased percentage of HNO3. Use just prior to the last polishing operation. If that does not provide enough detailed information, contact asfm chemical manufacturer directly. Electrolytic at 3 V for 2—10 s. Immerse with gentle agitation 15—30 s.

Repeat three times and repolish lightly. If the chemical is not listed or if chemical mixtures are being used, contact the glove manufacturer for a recommendation. Immerse with gentle agitation 1—30 s. Dissolve CrO3 in asm water and cool before adding acetic acid. Immerse few seconds to a minute or more.

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Electrolytic at 10 V 0. Immerse specimen face up, gently agitate solution aatm coloration begins, allow to settle. Use fresh or age up to 1 min. Electrolytic at 80 V for 5—30 min. Vary HF to increase or decrease activity. 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.

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

The specimen is examined as polished under polarized light. At this time the specimen should be ready for examination via polarized light.

Solutions are listed to highlight phases present in most major alloy systems. Immerse or swab 5—30 s. Safety precautions and miscellaneous information are also included.

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

Use fresh, but allow to cool. A hot water rinse just prior to etching may be used to activate the reaction.

Originally approved in Lightly pre-etch specimen before use. Made more active by adding few drops of H2SO4 just before use. Electrolytic at 6 V for 5—20 s. 4e07

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ASTM E407-07 Standard Practice for Microetching Metals and Alloys

Use stainless steel cathode and platinum or Nichrome wire wstm to specimen. Make concentration changes on this basis. At 30 V, etch for 1 min.

Reveals Ti- and Cb-rich areas at a faster rate than grain boundaries. Stop etch when surface is red-violet.

Precaution—Also poisonous by ingestion as well as skin contact. For best results use before pellets have dissolved. Solution good for several days, or longer. Users should be aware of the type of hazards involved in the use of all chemicals used, including those hazards that are immediate, long-term, visible, invisible, Copyright?

Stop when surface is dark. Start atm 3 V dc. NOTE 2—Electrolytic etchants are italicized. Use fresh—immerse few seconds to a minute. Methanol should be used in a properly designed chemical fume hood.