Influence of machining induced martensite on fatigue durability of torsion coil spring made of SUS 304

Abstract

The brake hose made of austenitic stainless steel SUS 304 has several excellent characteristics such as a linear operation feeling during brake, light weight, impact resistance, etc. as compared with conventional rubber brake hose. In this study, we clarify the influence of the change in physical properties due to the process induced martensitic transformation in SUS 304 on fatigue durability of torsion coil springs for brake hoses for motorcycles, which is a security part, and propose a prediction method for fatigue life and an optimum processing method.