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Turbine steels
692
CURRENT TOPICS.
[J. F. I.
main object of the investigation herein recorded was to determine carefully the elastic shearing strength of ductile and semi-ductile steel and to find the ratio of the elastic shearing strength to the elastic tensile strength with the hope that definite information would thereby be obtained on the breakdown of the elastic action of various grades of steel and on the limits of the theories of combined stress. Apart from the problem of co,mbined stress there has been also a lack of knowledge of the correct elastic shearing strength of various grades of steel and of the general nature of elastic shearing failure as well as of methods of determining the correct shearing strength from tests. This bulletin presents the results of experiments with six grades of steel, three carbon steels and three alloy steels ; namely, soft, mild, and medium carbon steel; and vanadium? nickel, and chromic-nickel alloy steel. The elastic strength in tension, in compression, and in shear is given for each of the six grades of steel. R. (NorthTurbine Steels. W. H. HATFIELD and H. M. DUNCAN. East Coast Iwtitutiorz of Engineers and Shifibzsilders, March 19, Igzo.)-This Paper constitutes a report of: I. An investigation into the response which commercial forgings made to the different forms of mechanical testing nosw in vogue. 2. Similar investigations into the mechanical properties of turbine parts which had given satisfactory service and also of those which had failed, with a view to eliciting reliable information concerning the relative importance of the different values to be obtained from the different forms of mechanical tests. 3. Experiments with the four steels covered in the British Electrical and Allied Manufacturers’ Association specification with a view to determining the mechanical properties, under laboratory conditions, of size, heat-treatment, etc. 4. Considerations in the light of the results obtained from items I, 2 and 3, as to which, if any, additional forms of test might be adopted for inclusion in the British Electrical and Allied Manufacturers’ Association specification. The following mechanical tests, which are briefly described in the Paper, were employed during the investigations, and the results obtained are reported: tensile, torsion, bend, Charpy, Fremont and Izod tests; Arnold alternating test; Stanton, Sankey and Brine11 tests ; “ Shore Scleroscope ” hardness tests.
CURRENT TOPICS.
[J. F. I.
main object of the investigation herein recorded was to determine carefully the elastic shearing strength of ductile and semi-ductile steel and to find the ratio of the elastic shearing strength to the elastic tensile strength with the hope that definite information would thereby be obtained on the breakdown of the elastic action of various grades of steel and on the limits of the theories of combined stress. Apart from the problem of co,mbined stress there has been also a lack of knowledge of the correct elastic shearing strength of various grades of steel and of the general nature of elastic shearing failure as well as of methods of determining the correct shearing strength from tests. This bulletin presents the results of experiments with six grades of steel, three carbon steels and three alloy steels ; namely, soft, mild, and medium carbon steel; and vanadium? nickel, and chromic-nickel alloy steel. The elastic strength in tension, in compression, and in shear is given for each of the six grades of steel. R. (NorthTurbine Steels. W. H. HATFIELD and H. M. DUNCAN. East Coast Iwtitutiorz of Engineers and Shifibzsilders, March 19, Igzo.)-This Paper constitutes a report of: I. An investigation into the response which commercial forgings made to the different forms of mechanical testing nosw in vogue. 2. Similar investigations into the mechanical properties of turbine parts which had given satisfactory service and also of those which had failed, with a view to eliciting reliable information concerning the relative importance of the different values to be obtained from the different forms of mechanical tests. 3. Experiments with the four steels covered in the British Electrical and Allied Manufacturers’ Association specification with a view to determining the mechanical properties, under laboratory conditions, of size, heat-treatment, etc. 4. Considerations in the light of the results obtained from items I, 2 and 3, as to which, if any, additional forms of test might be adopted for inclusion in the British Electrical and Allied Manufacturers’ Association specification. The following mechanical tests, which are briefly described in the Paper, were employed during the investigations, and the results obtained are reported: tensile, torsion, bend, Charpy, Fremont and Izod tests; Arnold alternating test; Stanton, Sankey and Brine11 tests ; “ Shore Scleroscope ” hardness tests.