鉄-クロム-酸素系鋼での Primary Inclusion に関して

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The importance of inclusions has unquestionably been overemphasized in many cases. The number of investigations has been large, but in most cases too many variables have been present to allow definite conclusions to be drawn. Three excellent reports on this subject have been lately published : one by H. M. CHEN & J. CHIPMAN, another by D. C. HILTY, W. D. FORGENG & R. L. FOLKMAN, and a third by W. KOCH, J. BRUCH & H. ROHDE. In order to obtain a satisfactory solution to the inclusion problem, the following three questions must be answered : 1) What types of inclusions are formed under this experimental condition? 2) What caused many disagreements found between the above described three papers? 3) What is the process of transformation? Furthermore, it was necessary to establish consistent identifying methods for inclusions. We applied new resolving analyses using electron diffraction with higher accelerated voltages and using electron probe X-ray micro-analyzer. It was important to establish the foundation for promoting further investigations about complex systems. In the first report, we simply described what sorts of inclusions could be obtained when molten alloy was rapidly solidified. The work done during this investigation may be summarized as follows : 1. The structures of thus formed inclusions are divided into three groups by varying chromium contents : 1) Slightly distorted iron chromite (c/a=0.97 or 0.95) only 2) Slightly distorted iron chromite (c/a=0.95 & 0.89) and Cr_2O_3 2. The shapes of inclusions depend upon the various conditions, viz. Oxygen potential under the experimental condition, and the influence of co-existing elements, solidifying velocities, etc 3. In our results, formed iron chromite appeared with distorted structures, more or less, in all the steels, and the distortion degrees increased with a varying amount of chromium addition. 4. The diffraction patterns reflected by isolated addition residues showed diffused aspects. 5. Lattice constants of the distorted iron chromite increased with an increase in the chromium contents. 6. The causes of distortion for the iron chromite should be studied in more details.
社団法人日本鉄鋼協会の論文
1964-12-01

鉄-クロム-酸素系鋼での Primary Inclusion に関して

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