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CORROSION-FATIGUE OF METALS AS AFFECTED BY CHEMICAL COMPOSITION, HEAT TREATMENT AND COLD WORKING

26 pp. (English).
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 Summary

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PRKPRINT.—This paper wirl 4»e presented at the 8th Annual Convention of the American Soei.iy for Steel Treating, Chicago, September 20 to 24, 1026,/ This preprint is issued primarily to stimulate written disciweion, which may be trwwmitted to the Society headquarters, 4600 Prospect Ave., Cleveland, for presentation at the Convention. The paper is subject to correction and modification. PRICE 35 CENTS

CORROSION-FATIGUE OF METALS AS AFFECTED BY qjJEMJCAL COMPOSITION, HEAT TREATMENT AND COLD WORKING

McAdam Jr. ^"

• '1

Abstract

The author briefly gives the results of a previous M" investigation of corrosion-fatigue of metals and then sets forth the materials, machines and specimens used': in further investigation of this subject. The chemical" composition of the steels used is tabulated and the stress-cycle graph representing steels tested in air and in a water stream are shown. The writer describes and illustrates the corrosion-fatigue spots and is of the opinion that transverse cracks passing through, non-metallic inclusions usually surrounded by oxide coating are the origins of corrosion-fatigue failure. For the investigation, the results of which are given in this paper, corrosion-fatigue tests and ordinary endurance, tests were made in a series of carbon steels ranging from 0.033 to 1.09 per cent carbon.

The writer sets forth his findings in experiments with carbon steels, nickel steels, high chromium steels and chromium-nickel steels and gives the effect of chemical composition and physical properties of corrosion-fatigue.

The author is of the opinion that corrosion-fatigue depends on two factors—corrosion intensity and, a stress range and that the corrosion-fatigue limit depends on a strength factor as well as on corrosion-resistance.

Part 1.—Corrosion-Fatigue of Steel Prkvioi" Investigation

A preliminary investigation of corrosion-fatigue of metals has been described in a recent paper1. In that investigation, rotatinir-eantilever specimens, of the eonically tapered design

printed by permission of lb' ^iv r*tar if tin' ,iv-.

Mi. J. McAdam. Jr., ''Strcss-Sti'aiii-Cycl' l.elationship and Corrosion-Fatigue of Metals,'1 ['resented at Twenty-ninth Annual Meeting of , oe American Society for Testing Materials and to be published in the proceedings. A. S T. M , Vol. 26 (1920).

The author. Dr. I). J. McAdam, Jr., is metallurgist U. s. Naval Knsri iieerinjj- Experiment Stution. Annnpulis, NM.

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