where on the place can I find charts of spheroidal annealing (%)? I need it for steels SAE 4140,1038 and 1022.

Thanks

Im finding non uniform micro structure on a carburised gear. I would like to know at which stage of process it has resulted in structural non uniformity. operational details are below

Material: 16NCD13

When I add the HCl, there is a precipitate that forms. The first time that I did this, I filtered the precipitate out before using the etchant. Another time, I did not filter the precipitate, and the solution seemed overly aggresive by comparison, but this could have been due to other variables that were not precisely controlled.

I've been through two iterations and end up with the TiN layer smeared in all directions, and embedded into the soft sheet steel - not at all representative of what it should look like. The second iteration was with aluminum foil wrapped over the surface with the same result.

We have automated polishing equipment, and the recipe I used is:

120 diamond disc, 5 mins
220 diamond disc, 1 min
9-micron nylon polish, 5 mins
3-micron cloth polish, 5 mins

I've examined the sample in the metallograph after each step. It appears that the TiN layer is smeared by the first two diamond steps. The polishing steps do not remove this smeared layer.

Is anyone able to tell me what it is all about? If we are going to heat it up to degree celsius, are we not modifying the microstructure of the steel?

I'm currently working on metallic/composite material mainly based on silver (88 wt%) obtained by powder technology.
I would like to reveal the grain microstructure of silver and I have tried NH4OH + H2O2 with different concentrations and different holding time (either by swabbing or immersing) without any results.

Could you help me please ?

20 mL HCl
4 mL H2O2 (3%)

The steel is a nitrogen alloyed martensitic stainless with the following compositions:
C: 0.33%
Si: 0.80%
Mn: 0.41%
P: 0.017%
S: 0.002%
Cr: 15.70%
Mo: 0.93%
Ni: 0.25%
V: 0.02%
N: 0.36%

Can anyone tell me a good solution for electropolishing 100Cr6 steel(about 1,5%Cr and 1%C) and what voltage should I use for that solution?

I have to polish my material to measure residual stresses so unfortunately I can’t polish it mechanically.

I have FeCr Ferritic alloy. I am going to observe grain boundary of this Binary alloy using SEM and to see boundary of each elements/grains or particle.

my alloy concentration is 2,6,7,10,12,16 @ Wt % Cr. Do you have any suggestion of Etchant tha i should use to reveal the boundary ?

Si - 0,39
Mn - 16.61
Fe - 72.92
Cr - 9.58
Cu - 1.16

I have a sintered ceramic sample SrO=15wt% SiO2= 33.5wt% I had made a lot test and some analysis by EDS Technique. But I think that is wrong my results. I want ask you if know if by EBSD THERE ARE NO INTERFERENCES from cuantify theses amounts.

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

Thank you,

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.

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????

It's a work for the university,

40 mm dia med carbon boron steel with 5mm case.