618 快削鋼SUM24Lの衝撃引張り力学特性の予疲労依存性(材料・構造部材の動的特性(3),ものづくりにおける基礎研究と先端技術の融合)

概要

論文の詳細を見る
In near future, the regulation for Pb as an alloy component, such as the RoHS directive, will be severer. So far, many types of non Pb added free-cutting steels have been appeared. But in order to utilize new free-cutting steels, it is necessary to know the mechanical properties of conventional Pb added free-cutting steels. In the past, dynamic and quasi-static mechanical properties for virgin specimen of Pb added SUM24L (JIS G 4804: 2008, equivalent to AISI 12L14 steel) were acquired by tensile tests at strain rates of 1×10^3s^<-1> and 1×10^<-3>s^<-1>, respectively, at room temperature. In the present paper, the same tests were carried out for pre-fatigued specimens. This loading combination, fatigue and impact, simulates a certain service condition, normal operational loading and accidental dynamic loading. As a result, the degradation of mechanical properties was not so large.
2010-11-27