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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Pure Ni ast high Ni alloys, 47, 25,31c 38,50, 50,89, aztm, 50, 83, 98, 13a 38,50, 25,47, 48b, 94,34 50, 83, 40,74e, 25, 74e, 50, 94,12, 87, 89,25, 94, 13a 19b,22a general structure grain boundary sul?
Electrolytic at 50—60 V for 10—20 s. When more than one etchant number is given for a particular use, they are usually given in order of preference. Electrolytic etch, colors d-ferrite in stainless steels.
Pure Ta Ta alloys, 62 65, 61, 62, 66, aztm, general general general general general structure structure structure structure structure general structure general structure grain boundaries and inclusions grain boundaries—retains carbide precipitate Thorium Base: Immerse with gentle agitation 1—30 s.
ASTM E Standard Practice for Microetching Metals and Alloys_百度文库
All persons using any etchants should be thoroughly familiar with all of the chemicals involved and the proper procedure for handling, mixing, and disposing of each chemical, as well as any combinations of those chemicals. Composition given will saturate the solution with NaCl.
Summary of Practice 4. In all cases, extreme care should be taken to remove all traces of the sstm by thorough washing and complete drying of the specimen before placing it on the microscope stage.
Increase HF to exaggerate grain boundaries. Etching rate is increased, sensitivity decreased with increased percentage of HNO3. Polishes at high currents. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
HF attacks and HNO3 brightens the surface of titanium. Immerse to 2 min to darken matrix to reveal carbides and phosphides. After etching, water rinse, alcohol rinse, and dry. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
ASTM E407-07 Standard Practice for Microetching Metals and Alloys
Swab 1—3 min in Solution A acts as etch polish. Note—Use inert substance between cloth and wheel to prevent attack of the wheel. Repeat as often as necessary. Use carbon cathode raising d-c voltage from 0—30 V in 30 s. Electrolytic at 15—50 V for 15—60 s.
If surface is insufficiently etched use Solution B electrolytically at 1? Gently agitate the solution while observing the polished surface. A light pre-etch with a general-purpose chemical etchant may lead to sharper delineation of the structure after tint etching. Rinse with methanol and blow dry. A number of etchants generate fumes or vapors and should only be stored in properly vented containers.
Then electrolytic in Solution B: Distilled water is then slowly added to the wheel and polishing continued until the surface is bright. To slow reaction, add water to mL very carefully with stirring. Helps to chemically polish. Stop the evaporation when the color is purple to violet, although in some cases, thinner? Some of these etchants will r407 work at all e470 water is not present. Alloys are listed as a group or series when one or more etchants are common to the group or series. Swab 3—10 s or immerse to 2 min.
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, s407, 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, axtm 3b, 6 general structure grain structure under polarized light grain boundaries ast, slip lines general structure grain structure under polarized light phase identi?
Immerse with gentle agitation 15—30 s. To mix, add the HCl to CrO3. Dissolve CrO3 in hot water and cool before adding acetic acid.