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Jan Ysselstein

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Jan Ysselstein last won the day on March 23 2017

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  • Gender
    Male
  • Location
    west coast of usa ( USACAstan )
  • Interests
    shaping and making of steel and iron

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  1. Jan Ysselstein

    'Konasamudram' Process

    Now we have chased some of the cementite to the area containing the micro alloys ...we still have a long way to go as the photo shows a lot of cementite still in the areas that are converting to pearlite. I have what i need from this post and consider it finished....now to some new ingots. I may post a photo if I get back to working with this sample.
  2. Jan Ysselstein

    'Konasamudram' Process

    All the scale on the sample has been removed.....still a little grinding to be done to get at the decarburized area shown in the photo. Though the above photograph field is 7 mm wide the photos below are 13mm wide and give an idea of what the pattern me become. The photos below are posted because I want a good record of what is going on and be able to trace to all back. The two microscope photos ( 13mm field ) show a lot of carbon finely spheroidized and a lot of larger carbon both are cementite...we will try to dissolve both materials ( cannot do one without the other ) and see id we can get one type of cementite to form...right now we have 2.
  3. Jan Ysselstein

    San Mai WIP

    I think the coeff. of expansion for 410 SS is closer to that of 1095 by a lot. 410 contains no Nickel and 1/2 the amount of Manganese. and has to be hardened for maximum corrosion protection.
  4. Jan Ysselstein

    San Mai WIP

    I have no idea but every piece of SS I see around here is 304 or 440 c...I will look up the difference.
  5. Jan Ysselstein

    'Konasamudram' Process

    After a little more forging, we now have this structure and it is creating a problem as even though I do not have the very large cementite fragments ....some of the cementite is getting much larger than neighboring ones..I am targeting a more even distribution of the spheroidal cementite. Next steps are to grind off some serious decarburization on one side and do the finish forging at a lower temperature and to a lower temperature..
  6. Jan Ysselstein

    San Mai WIP

    Is there a reason why you chose that SS and not say 304?
  7. Jan Ysselstein

    'Konasamudram' Process

    We are at the next forging step mot much material left but all looks good..we have forged at a high ( too high ) temperature and too much has gathered at the larger spheroidized particles. IT looks good but I will try to redistribute the carbon. If that works I will have a good path to a nice looking crucible steel. To get dendrite remnants that are very recognizable I will have to go another route.
  8. Jan Ysselstein

    'Konasamudram' Process

    I hope to just forge it out and follow it with the microscope. pw3
  9. Jan Ysselstein

    In Search of Hamon, Experiments at the Forge #1

    It is fun, I do not make videos but this weld would have been interesting to film. Jan
  10. Jan Ysselstein

    'Konasamudram' Process

    I hope to just forge it out and follow it with the microscope. I think I am out of the residual fragments of large carbides..that is a big deal for me as I like a high carbon content. I have taken all the old "wootz" or crucible steel experiments and broken them into bits for steel showing a strong hamon ....I hope. So the whole process from picking ingredients to etching needs constant adjusting for a better result. I should make a little progress this Winter.
  11. Jan Ysselstein

    In Search of Hamon, Experiments at the Forge #1

    SO, we are in the process of taking the above chips and making a blade with them, here are some pics of the process so far. The chips were welded with a borax/silica flux...the pile may be a bit too high in carbon as when I cut the stack it looks like cast iron may be in the mix ( very, very high carbon sparking). On the left a stack of welded bits on the right a tray of bits used to weld and not stick to the tray.
  12. Jan Ysselstein

    'Konasamudram' Process

    The main thing I am absorbing from Pendray and Verhoeven is ..the alloy composition and the D.E.T. the rest for me is work details...we all have slightly different work details and seem to be much more attached to them than we think. I will be getting back to the completion of this project next week and thought I would show a couple of picture of a bar I am working on. I find this bar interesting because it is about the size of the bars Verhoeven purchased from an Indian ( as in India ) armory on several occasions, 5/16" thick and about 6"long. The feature I like is the areas of light and dark are about equal..the negative is the dendritic patterns are rapidly becoming hard to find and may be gone by the time I finnish forging. I want dendritic evidence in my final pattern ( a matter of personal taste ). The field width is about 7mm..I expect the areas to roughly triple in size....the pics look fuzzy but the contrast is very good between light and dark.
  13. Jan Ysselstein

    'Konasamudram' Process

    Yes , I have read something like that as well...some clay covered and some bare...I have not read about the several days in the forge ( Al Pendray demonstrated this process in a video posted here ). I have read 2-4 hrs at high heat sometimes 2 or more times. I assume they were moving the carbon to grain boundaries and calling that look "mottled". My challenge is to get a routine sequence established which gives a high probability of success. After that I can take any element of that sequence and play. Looking at the iron in Museums, the blades are large and many have almost no defects , indication very good ingots and forging practice. The main theme is learning about iron and steel. When working with these materials over time , lots of little details come into view. These details are shared with the makers of the past ( unavoidable). One of the two ingots forged yesterday seemed more willing to crack than the other..I will try to find out if the current structure is playing a role or is an indicator....did I not soak that ingot long enough....I soak without clay as my furnace produces very little scale at that temperature.
  14. Jan Ysselstein

    'Konasamudram' Process

    I thought I would add a couple of pictures which ask the question..where is the carbon? This material should be 1.6-1.8% Carbon...and I would prefer to have it everywhere other than in primary cementite or heavy grain boundary cementite....I want the carbon to be diffuse and begin to form a pattern over the next 20 or so cycles.... The pictures show a standard ( Normal) dendritic pattern...the cementite is almost completely dispersed ...it was in the now dark areas. I still have a ways to go and may not be able to dissolve 100% of the coarse cementite...at 2.% carbon this would be much more difficult to do.
  15. Jan Ysselstein

    'Konasamudram' Process

    Not only the reader may not know who done it but the writer has no clue either . I am testing some ideas that may not be valid, it is fun trying..if I have to adjust my thinking down stream, I will but not yet.
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