溶融金属中における軟鋼の疲労挙動に対する考察

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It is considered that the fatigue behavior in the liquid metal environment depends upon the simultaneous effect of the chemical actions such as dissolution of solid metal into molten metal, diffusion of molten metal into solid metal and embrittling tendency of liquid metal. In this contact, several factors such as the tensile properties of a notched specimen, dissolution rate, hardness distribution and residual stress in the surface layer of the low carbon steel which had been immersed in molten tin and lead, mode of non-propagating crack and path fatigue crack and deformed layer at crack side through a X-ray micro-beam. Analysis, from which the following experimental facts have been made clear ; (1) The increase in the fatigue strength of low carbon steel in molten tin is mainly caused by the increasing compressive stress originating by the diffusion of tin in steel and by the dissolution of the crack tip of steel in the molten tin. (2) The fatigue crack in molten metal propagates itself along the grain boundary while the fatigue crack in air crosses over the grain. (3) The mean crack growth rate under the same stress level depends upon the environment. The crystal distorsion at crack side becomes larger as the mean crack growth rate decreases. (4) The fatigue strength in high stress level is made extensively to decrease by liquid metal embrittlement. (5) The chemical action between the molten metal and the solid metal will control the behaviour of the lower stress with a larger number of cycle fatigue, and the embrittlement effect by the liquid metal is dominant over the higher stress with a smaller number of cycle fatigue. (6) By developing the above-mentioned results, the system of S-N curves of the solid metal in a liquid metal environment is schematically proposed.
1969-08-15

溶融金属中における軟鋼の疲労挙動に対する考察

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