析出強化型材料の耐食性に及ぼす微細構造の影響に関する基礎的研究

概要

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Aluminum alloys have many attractive characteristics for the ship applications. The materials used for ship constructions are particularly required to have good weldability and corrosion resistance to seawater. The mechanical and chemical properties of precipitation hardening aluminum alloys depend on their microstructure, which results from their chemical composition and heat treatment. In this paper the strength and the corrosion behavior of the aluminum alloys, which were industrially manufactured for ship, has been studied. (1) Based on the tensile test results of butt-welded joints of 22 kinds of aluminum alloy 6N01-T5 extrusions, the effect of heat input, section thickness, gauge length and chemical composition on the 0.2 % offset strength was studied. (2) Corrosion behavior of 6000 series alloys was investigated for a soak in synthetic seawater at 25℃ for one year. The relationship between the corrosion morphology, the microstructure and the strength degradation was determined. (3) From a practically used 6 m long boat of which hull was cast in Al-5 Si-0.1 Fe-0.4 Mg alloy, test material was cut out and tested. The samples were evaluated by tensile tests, impact tests and microstructural analyses.
独立行政法人海上技術安全研究所の論文
2001-10-05