熔融炭素鋼及ニッケル鋼中への諸元素の擴散に就て

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Up to the present, the investigation on diffusion of various elements into molten steel is very scanty, notwithstanding the subject is very important for the manufacture of special steels. The authors took the Swedish Carbon-steel wtth 0.3% C and the home made Nickel-steel with 3.29% Ni and 0.27% C as base materials. From them cylindrical samples 17 mm dia. and 60 mm long were prepared ; and at their upper or lower part bores were spared, in which various elements as metals or ferro-alloys are to be enclosed. Thus prepared samples are molten in Tammann tubes and held at 1, 500°∿1, 700℃ during 10 or 20 minutes, as the case may be. They are slowly cooled and cut longitudinally along the centre line, polished and the hardness on their sections is measured along 12 horizontal lines 5 mm apart by Rockwell and Schore hardness testers. The mean values of the hardness numbers on each line are plotted according to the height of the samples, and thus we get the hardness curves. From these hardness curves with their micrographs we could judge the manner of diffusion of various elements. As we expected, it depends upon the various factors as melting points of elements of ferro-alloys, temperature of the molten bath, position of enclosure according to their specific gravities, time kept at constant temperatures, etc. We found the conditions necessary for the uniform diffusion of various elements as Molybdenum, Nickel, Manganese, Chrome, Phosphorus, Vanadium, Titanium, Silicon and Carbon in both steels and also the interesting characteristics of the three elements Manganese, Titanium and Carbon in diffusion. Lastly we could not find any appreciable difference in diffusion of high-and low-carbon ferro-chromes or metallic chrome.
社団法人日本鉄鋼協会の論文
1936-01-25

熔融炭素鋼及ニッケル鋼中への諸元素の擴散に就て

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