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(Metallographic sample preparation and etching to reveal microstructure only)

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I have Nitric acid and Methanol, and I want to form Nital, what ratio should I use - Elvis 03/12/10 (0)
has anyone ever seen delayed cracking on micros? We have micros that showed no defects. Now, months later we are seeing cracks near stress lines from forming operaiton. Material is 17-4Ph etched in ferric chloride.
- huffmet 03/11/10 (0)
what is the best etch to use for bringing out grain boundaries in depleted uranium - jeff 03/04/10 (0)
We are looking for companies that can supply testing equipments and also offer services for testing of Boron carbide ceramics for the following properties:
Evaluation of Microstructure and Distribution of Silicon in BC Matrix
Density
Hardness
Fracture Toughness, Klc
Flexural Strength (MOR), 200 C
Elastic Modulus, 200 C
Poisson’s Ratio, 200 C
Compressive Strength, 200 C
Tensile Modulus
Please send the details to ak@smgroupindia.com or call me at +91-9810199147 in India. - Ashish Kansal 03/04/10 (0)
Sir,
I have done the estimation of nonmetallic inclusion using ASTM standard methods, comparing the standard charts. I have calculated the average indicative numbers, eg oxide inclusions- 2 of ~ 8um . can you pl. tell me what this indicative number represents, is it area %, or no. of inclusions per area of .8mm dia(observation was done at 100x using a circle of 800um dia in the microscope as given in the ASTM chart).How the results should be submitted?
Thank you
Radhika
- M.Radhika 03/04/10 (1)
- Re: Nonmetallic inclusion estimation - MLH 03/04/10 (0)
I am looking for an etch for an inconel 600 weld that joins carbon steel and 316 stainless steel. I would prefer it if the etch were not electrolytic since I have to do this work outside the lab. If there are no good etches then electrolytic would be OK.
Thanks very much. - Maureen Kuchta 03/03/10 (0)
Hi Does anyone have a good technique for etching a duplex to carbon weld so that it can be photographed? We use Nital for the carbon and NaOH for the duplex side, but this gives a matt finish to the carbon and a mirror finish to the duplex, which means the duplex just appears black or white on photographs, depending on the background. - D Wilkinson 03/02/10 (1)
- Re: Duplex to carbon weld image contrast - Andrew Binz 03/04/10 (0)
Hi!
Please do tell how to etch Ti 5553 alloy?? - Usman 02/26/10 (1)
- Re: How to etch Ti 5553 Alloy? - Jeff 02/27/10 (0)
Dear Experts,
Could you inform me which standard describes the Mannesmann type macro-etch test of steel slabs and where I can find a comparison chart for this test?
Thank you for your help. - Zsolt Csepeli 02/25/10 (1)
- Re: Mannesmann scale - SMP 02/25/10 (0)
If you have thin sections from a bar what is the best way to look for stringers? - HSheehan 02/24/10 (2)
- Re: Stringersin 316L Bar - Stu Smalinskas 03/11/10 (0)
- Re: Stringersin 316L Bar - yahoo.com 02/26/10 (0)
My spelling could be off.
But what is the formula for Wesley-Austen Etchant? And how is it used?...and what is it used for? - Kelly A. Ramos 02/23/10 (0)
Could you please tell me that is there any etchant for Ti-6Al-4V alloy which does not include HF? - Hamid 02/19/10 (1)
- Re: Etchant for Ti-6Al-4V - Jeff 02/20/10 (0)
Hi!
I am try to polish martensitic stainless steels with silica as a final step. I cant remove all tne particules from may samples after one hour of ultrawave. How I have to rinse my samples after final polishing????Thank you in advence - Martina 02/17/10 (1)
- Re: Rinse of steels samples after silica - MLH 02/18/10 (0)
Need to know the best etchant for inconel 738. - samsiah 02/16/10 (0)
Sir,
Apropos to the above please give the contacts/list of metascope manufacturers to detect cromium content in the metals/steels
Thanks
deepak_pitambare@rediffmail.com - Deepak Pitambare 02/14/10 (0)
I have AL-6XN stainless steel that I am trying to etch. Has anyone had success etching this alloy? And if so, what did you use?
Thank you for your help. - Ryan 02/08/10 (1)
- Re: AL-6XN Etchant - Kai 02/18/10 (0)
I'm the beginner in the metallargy, i have defficulty of determine the correct chemical concentration use for the etchant. A lot of book did not specified it. The chemicals are as the following:-
a. Ammonium Nitrate
b. Phosphoric Acid
c. Sodium Thiosulfate
d. Hydrocloric Acid
e. Zephiran Chloride
f. Sodium Hydroxide
h. Cupric Chloride
- Robert Tang 02/03/10 (1)
- Re: Chemical Concentration for Etchant - Jeff 02/03/10 (0)
hi there
I'm a new guy in this field,I need you help to tell me the way of working out of the grain size of sus430 tainless steel.
thank you! - spark 01/29/10 (1)
- Re: could you tell me how to work out the grain size of 430 stainless steel? - Jeff 02/01/10 (0)
How do I prepare 6000 series aluminum for grain structure analysis - Johnson 01/29/10 (1)
- Re: Etching aluminum 6000 series - Jeff 01/30/10 (0)
Hi There,
Can anyone share their technique for cross-sectioning Integrated Circuits. I would specifically like to preserve the die metal features and passivation layers. The SiC polishing discs I am using seem to crack the die at this area. If I use Diamond Discs I get alot of particles stuck in the Solder balls. Any thoughts would be appreciated. - Tami Western 01/28/10 (1)
- Re: Polishing ICs - Jeff 01/29/10 (0)
Hello experts,
The company where I work is a die casting aluminum plant and only deal with 383 aluminum alloy, average 0.15% Mg, and some castings after machining show up inclusions. Some external labs tell as the inclusion is Al2O3 and others MgAl2O4.
Is there any way to determine differences between aluminum oxide and spinel by optical or SEM equipment? or Is it possible to etch and see under the microscope color differences in polished samples?
Thank you,
Froilan - Froilan 01/26/10 (2)
- Re: Inclusions of Al2O3 and MgAl2O4 (spinel) - Kestutis 01/26/10 (1)
  - Re: Re: Inclusions of Al2O3 and MgAl2O4 (spinel) - Froilan 02/01/10 (0)
Hello,
I have a question, you might have the answer.
While checking the microstructural specifications of a steel material, I encountered a unit "% pps", described as a measure about inclusion, segregation and decarburisation.
I appreciate for your help in finding the meaning of this term.
Many thanks in advance. - eris durmusoglu 01/26/10 (1)
- Re: the meaning of unit "% pps" - Kestutis 01/26/10 (0)
How does etching receal metallic structures? - Joelle 01/25/10 (0)
hey my id is darshanabc@gmail.com.. anyone who cud help me out wid this topic pls send mails to my ID.i need it to be done b4 monday!. plz help me..! - darshan 01/23/10 (1)
- Re: determination of grain size in polycrystalline material - SMP 01/25/10 (0)
01/09/10
We want analise primery and secondary carbide in hardfacing weld metal with the help of microscope (Radical make + high resolution camera.We have tried Murakami / Kaling 1 reagents but we are not getting desired results.
Can u help in this????
Rakesh - Rakesh Bongale 01/22/10 (0)
Heloo,
I have to mesure the average diameter of grain for an hard-working structure(AISI 304, 0.1mm)with some kind of treatment.The grains are not so elongated but aren't equiaxed.The structure is very fine,I can hardly see it at 500X.
The request is max 10 microns!!!
Thank you! - Camelia 01/22/10 (1)
- Re: Measure average diameter - Kestutis 01/26/10 (0)
We are carrying Quench & Temper HT to our cylinder of Cr-Mo Grade. Cr-0.8/1.2 & Mo-0.15/0.3 C-0.34/0.38 Mn-0.5/0.8. The HT Carrying at 930Deg C & Quench in Polymer solution 12% Concentration.The toal cycle time for cylinder remain in furnace 60/65minutes. As quench Hardness we are getting 350-425 BHN. In quenching tank agitation also there.Microstructure reveals ferrite / Pearlite with martensite. What will the cause of ferrite.No retained austenite found.Temperature after quenching 40 to70 DegC.
We are cylinder manufactuerer this problem face in 90 lit cylinder. 317mmDia x 7.4 mmthk & 1200mmlength cylinder whose weight 95 Kgs.Will you pl suggest the cause of low hardness - deepak desai 01/22/10 (0)
I am checking a material certification to AMS-S-5000. The spec states that the macro etch specimens should bee better than or equal to S-2 R-1 C-2 of ASTM E-381. The ASTM spec does not explain these ratings. Is S-3 better or worse than S-2. Is there a chart that shows these ratings from best to worst? Any help appreciated. - Stuart Alexander 01/18/10 (3)
- Re: macro etch ratings - kelly 02/23/10 (0)
- Re: Re: macro etch ratings - Sanjay Vaghela 01/29/10 (0)
- Re: macro etch ratings - SMP 01/18/10 (1)
what's the beginning of the metallography?
It's a work for the university,
thanks!!! - javier 01/16/10 (1)
- Re: metallography - Kai 01/19/10 (0)
We want analise primery and secondary carbide in hardfacing weld metal with the help of microscope (Radical make + high resolution camera.We have tried Murakami / Kaling 1 reagents but we are not getting desired results.
Can u help in this???? - Rakesh 01/09/10 (0)
Hello,
I used Barker's reagent to see the microstructure of pure aluminum. Although it showed the microstructure in reasonable way, I would like to see the color etched microstructure of pure aluminum. So I tried Beraha's tint etchant which was recommended for Aluminum alloy. But it did not work well.
Beraha's tint etchant is not appropriate for pure aluminum? Or do I need to etch 2 times(first Barker's reagent and then etch that with Beraha's tint etchant)?
Thank you.
- Dongok Kim 12/30/09 (1)
- Re: Color Etch of Pure Aluminum - TVP 01/08/10 (0)
how to cut and section (longitudinal) an induction hardened shaft, that has lot of internas stresses?
40 mm dia med carbon boron steel with 5mm case.
while cutting, the stresses inside simply catch the wheel. - SENTHIL 12/29/09 (2)
- Re: metallogrpahy abrasive cutting - Kai 01/21/10 (0)
- Re: metallogrpahy abrasive cutting - Stu Smalinskas 01/04/10 (0)
I currently have a mixture of HF/HNO3/H2O at 1:1:2 by volume respectively. It contains a maximum of 30% HF. Do you think I can work with this to etch tantalum samples?
What do you recommend? - Philip 12/29/09 (1)
- Re: Etching tantalum - TVP 01/08/10 (0)
Hello,
I need to reveal the austenitetic grain sizes of the 60SiCr7 spring steel material.
I have tried picral, nital, viella's and something more that doesnt have specific names.
But non of them has worked.
Is there anyone who has worked with this material before.
Am I using wrong etchants, or can I be doing wrong about the time or the temperature. - Alper 12/16/09 (0)
Dear all,
is someone experienced in die sectionning such as MOS transistors and able to tell me how to etch the cross section to reveal the different zones (epitaxial layer, p dwell, n-/n+ layers...)
thank you for your help. - Maryse S 12/07/09 (0)
Hi,
How do I prepare and etch aluminum alloys. - khaled 12/02/09 (1)
- Re: How do I prepare and etch 356 aluminum alloys. - Jeff 12/05/09 (0)
A major impediment of understanding the initial solidification is the difficulty of observing the shape and size of sub-surface hooks in cast samples.Special etching reagents are required to reveal clearly the initially solidified structure near the hook,prior to subsequent phase transformations.
Although picric acid solution reveals the dendritic structure,the hook is difficult to distinguish from the rest of the microstructure.Oberhoffer's reagent relies on the segrefation of phosphorus,and can only reveal the linear profile of a hook but not the dendritic structure close to it.Thus, can anyone suggest a better etching reagent? Thanks!
And can you send the information to my email:yangwen-flying@163.com
Appreciate! - Wen Yang 12/01/09 (2)
- Re: Etching reagent for hook structure - SMP 12/24/09 (0)
-----OLDER Q&A HAVE BEEN ARCHIVED-----

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