炭素鋼の表面脱炭と疲労強さとの関係についての研究(第1報) : 1. 片持梁型回転曲げ疲労強度について

概要

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The effects of surface decarburization on the fatigue properties of 0.6%C carbon steel, whose depth decarburized ranges from 0.17 mm to 0.5 mm, were obtained by the two types of test specimens, A-type the bar stock piece and B-type the filleted piece ; and these specimens consist of two groups of structures, that is, a normalized one and a quenched-tempered one. As the depth decarburized increases, the tensile strength of normalized steel decreases ; the elongation, contraction of area and impact value have the minimum value at the depth decarburized 0.2〜0.3 mm. Due to the surface decarburization, the fatigue limit were remarkably reduced, and their decreasing rates get greater up to about the 0.3 mm depth decarburized. By a quenching-tempering treatment, the fatigue durability becomes greater than that of normalized steel. The fatigue limits for A-type specimens are less than those for B-type ones. This reason appars to be the occurence of fretting corrosion on the holder part of specimen. But the detriment of fretting corrosion for fatigue limit appears to be diminished by the skin free ferrite on the surface of specimens obtained br decarburizing.
社団法人日本材料学会の論文
1959-02-15