Macroetching, also known as deep etching, involves etching specimens prepared with a suitable acid or reagent for macrostructural examination. Contact us. 1 This test method is under the jurisdiction of ASTM Committee E-4 on. Metallography and is the direct responsibility of Subcommittee E on Sam- pling. 10 Nov ASTM E Standard Test Method for Macroetching Metals and Alloys_ 机械/仪表_工程科技_专业资料。美国材料与试验协会(ASTM)标准.
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ASTM E – 00 Standard Test Method for Macroetching Metals and Alloys NO_PDF
Click here to request a quote Chicago Lab: Macroetching will also show the presence of discontinuities and voids, such as seams, laps, porosity, flakes, bursts, extrusion rupture, cracks, and so forth.
Forge shops, in addition, use macroetching to reveal flow lines in setting up the best forging practice, die design, and metal flow. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Chemical analyses or other means of determining the chemical composition would have to be performed to determine the extent of variation. Go to Navigation Go to Content.
The metallurgical engineering team at SGS MSi has the expertise to meet all your material requirements for acid etch processes. In the aluminum industry, macroetching is used to evaluate extrusions as well as the other products such as forgings, sheets, and so forth.
Defects such as coring, cracks, and porthole die welds are identified.
Study of weld structures, definition of w340 penetration, dilution of filler metal by base metals, entrapment of flux, porosity, and cracks in weld and heat affect zones, etc. The information provided about variations in chemical composition is strictly qualitative but the location of extremes in segregation will be shown. Click here to request a quote.
Metallographic specimens and chemical analyses will provide the necessary detailed information about specific localities but they cannot give data about variation from one place to another unless d340 inordinate number of specimens are taken. Macroetch Examinations 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: Contact our sales team to assist in specification review or a cost estimate for your testing.
Referenced Asfm purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The copper industry uses macroetching for control of surface porosity in wire bar. It is also used in the heat-treating shop to determine location of hard or soft spots, tong marks, quenching cracks, case sstm in shallow-hardening steels, case depth in carburization of dies, effectiveness of stop-off coatings in carburization, and so forth.
Forging shops and foundries also use macroetching to determine the presence of internal faults atm surface defects.
Other applications of macroetching include: 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 most common reagent for macroetching iron and steel is a 1: Historical Version s – view previous versions of standard Translated Version s: In the machine shop, it can be used for the determination of grinding cracks in tools and dies.
For an example of the use of macroetching in e3440 steel forging industry see Method E Link to Active This link will always route to the current Satm version of the standard.
Development of grain flow in a forged part or fastener, which is a critical property for the integrity of the forging. Evaluation of machined parts for grinding cracks in tools and dies.
Evaluation of heat treated parts to determine locations of hard or soft spots, tong marks, quench cracks, case depth in induction hardened or carburized parts, and effectiveness of stop-off coatings.
Historical Version s – view previous versions of standard. 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. For specific warning statements, see 6.