鑄鋼の高温割れ傾向の新試驗法
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概要
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A type of miniature test casting was devised as the means of investigating the influence of chemical composition of cast steel upon hot-tearing tendency. The test casting consisted of a 40 mm diameter vertical cylinder with four horizontal and radial branches, each 70 mm long. The casting wheighed so small as 2 kg that it could be poured from an ordinary sampling spoon. Mould cavity for each branch was made of a 8mm I.D. quartz tube, one end of which penetrated into the central mould cavity for the vertical cylinder, the depth of penetration being 10mm. The contraction of the branch was restrained by a steel pipe which was inserted in between the vertical cylinder and a small flange at the outer end of the branch. This restrained contraction caused a complete or incomplete hot-tearing at the junction of the branch and the vertical cylinder. The hot-tearing tendency of a cast steel could be evaluated from the load required for the fracture of the branch at room temperature and also from the area of hot-tear on the fractured surface, provided that the mechanical and thermal variables of the casting were kept constant. Reproducibility and sensitivity of the result were satisfactory. For example the difference between hot-tearing tendencies of two heats of steel containing 0.020% and 0.030% sulphur respectively could be discerned clearly by pouring only a pair of spoon samples of steel. Although the test casting was very small in size, the cooling of the portion where hot-tearing occurred was as slow as that of a 40mm diameter cylinder casting or of a 20mm thick plate casting. So the results of investigation by this test casting might well be applied to castings having wall-thickness of 10-30mm. Another significant advantage of this method was that there was only a limited amount of oxide film or scale formed on the surface of hot-tears, so that it was possible to examine more precisely the microscopic appearance of hot-tears in various types of steel castings.
- 社団法人日本鉄鋼協会の論文
- 1954-06-25
著者
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