Mechanical Characteristics and Fatigue Strength of Ceramic-Sprayed S45C Steel

J. Ocean Eng. Technol. 1998;12(1):32-38.

세라믹 용사된 S45C강재의 기계적 특성 및 피로강도

오맹종,오창배,김귀식

제주대학교 대학원,제주대학교 대학원,제주대학교 대학원

Keywords: Ceramic-sprayer steel, Mechanical properties, Corrosion fatigue strength, Heat treatment, Rotary bending fatigue test

핵심용어: 세라믹 용사재, 기계적 성질, 부식 피로강도, 열처리, 회전굽힘 피로 시험

Abstract

This paper is to investigate of microhardness, adhesive strength, tensile strength, and fatigue strength of ceramic sprayed steel. Rotary bending fatigue tests have been conducted at room temperature in air and 3% NaCl solution using specimens of carbon steel(S45C) with sprayed coating layers of Ni-4.5% Al(under coating) and $TiO_2$ (top coating). The microhardness has been improved at $800^{circ}C$ heat treatment and 150mm spraying distance. Tensile strength of the sprayed steel is dependent on the substrate strength. The fatigue strength of the sprayed steel is larger than that of substrate due to blasting and constraint surface of plastic deformation effect. In low stress level, the corrosion fatigue strength of the sprayed steel were lower than that of fatigue strength in air by corrosion.