Metallography Applied to Siderurgic Products
Metallography Applied to Siderurgic Products
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Steel from o 5 per cent, to 0*85 per cent, of Carbon. This is made up of the same elements as that with the lower percentage and the quantity of pearlite grows with that of carbon, but at a slower rate.
It has been mentioned, indeed, in connection with ferrite, that in such steel it keeps 0*27 per cent, of carbon in solution, whereas, in those with a smaller percentage, the whole of the carbon is contained in pearlite, under the form of carbide. It follows that in steel with o 5 per cent, or mo...re the proportion of pearlite is relatively less, since ferrite, eliminated first, has already carried away part of the carbon.
Guillet observed steel containing 0*55 per cent, of carbon with the planimeter and found that the area occupied by the pearlite was about -^5- of the whole.
1000 Now, if we calculate the area of the pearlite as it would be if ferrite contained no carbon, we obtain 5-. If 1000 instead, we suppose that ferrite contains 0^27 per cent.
of carbon, we get, a figure much nearer that 1000 given by actual observation, and sufficiently near for all practical purposes, especially considering the diffi- culty of planimetric sketching under such conditions, and the inevitable divergences presented by chemical analysis.
What to read after Metallography Applied to Siderurgic Products?
You can find similar books in the "Read Also" column, or choose other free books by Umberto Savoia to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Steel from o 5 per cent, to 0*85 per cent, of Carbon. This is made up of the same elements as that with the lower percentage and the quantity of pearlite grows with that of carbon, but at a slower rate.
It has been mentioned, indeed, in connection with ferrite, that in such steel it keeps 0*27 per cent, of carbon in solution, whereas, in those with a smaller percentage, the whole of the carbon is contained in pearlite, under the form of carbide. It follows that in steel with o 5 per cent, or mo...re the proportion of pearlite is relatively less, since ferrite, eliminated first, has already carried away part of the carbon.
Guillet observed steel containing 0*55 per cent, of carbon with the planimeter and found that the area occupied by the pearlite was about -^5- of the whole.
1000 Now, if we calculate the area of the pearlite as it would be if ferrite contained no carbon, we obtain 5-. If 1000 instead, we suppose that ferrite contains 0^27 per cent.
of carbon, we get, a figure much nearer that 1000 given by actual observation, and sufficiently near for all practical purposes, especially considering the diffi- culty of planimetric sketching under such conditions, and the inevitable divergences presented by chemical analysis.
What to read after Metallography Applied to Siderurgic Products?
You can find similar books in the "Read Also" column, or choose other free books by Umberto Savoia to read onlineMoreLess
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