EFFECT OF NaCl SOLUTION SPRAYING ON FATIGUE LIVES OF SMOOTH AND SLIT SPECIMENS OF 0.37% CARBON STEEL

Chobin Makabe (), Md. Shafiul Ferdous (), Akimichi Shimabukuro () and Anggit Murdani ()
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Chobin Makabe: Department of Mechanical Systems Engineering, Faculty of Engineering, University of the Ryukyus, 1 Senbaru, Nishihara, Nakagami-gun, Okinawa 903-0213, Japan
Md. Shafiul Ferdous: #x2020;Faculty of Engineering, University of the Ryukyus, 1 Senbaru, Nishihara, Nakagami-gun, Okinawa 903-0213, Japan
Akimichi Shimabukuro: #x2020;Faculty of Engineering, University of the Ryukyus, 1 Senbaru, Nishihara, Nakagami-gun, Okinawa 903-0213, Japan
Anggit Murdani: #x2021;Department of Mechanical Engineering, Faculty of Engineering, Politeknik Negeri Malang, Malang 65141, Indonesia

Surface Review and Letters (SRL), 2017, vol. 24, issue 01, 1-10

Abstract: The fatigue crack initiation life and growth rate are affected by experimental conditions. A corrosive environment can be created in a laboratory by means of dropping salt water onto the specimen surface, spraying chloride mist into the experimental chamber, etc. In the case of smooth specimens of some metals, fatigue life is shortened and the fatigue limit disappears under such corrosive experimental conditions. In this study, the effects of intermittent spraying of 3% NaCl solution-mist on corrosion fatigue behavior were investigated. The material used was 0.37% carbon steel. This is called JIS S35C in Japan. Spraying of 3% NaCl solution-mist attacked the surface layer of the specimen. It is well known that the pitting, oxidation–reduction reaction, etc. affect the fatigue strength of metals in a corrosive environment. We carried out corrosion fatigue tests with smooth specimens, holed specimens and slit specimens. Then the effects of such specimen geometry on the fatigue strength were investigated when the NaCl solution-mist was sprayed onto the specimen surface. In the case of lower stress amplitude application in slit specimens, the fatigue life in a corrosive atmosphere was longer than that in the open air. It is discussed that the behavior is related to the crack closure which happens when the oxide builds up and clogs the crack or slit.

Keywords: Corrosion fatigue; smooth specimen; holed specimen; slit specimen; 3% NaCl solution (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500111

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