Observation and Analysis of Fractured Surfaces of Metal Materials through Ultrasonic Fatigue Testing

Introduction

With metal materials in general, internal inclusions may become an origin of a fatigue fracture. To evaluate the fatigue strength of metal materials, we need to use a technique to detect inclusions in metal materials which may lead to an internal fracture and to identify the elements of such inclusions. In order to detect inclusions, the best way is to actually carry out a fatigue test. In this experiment, we detected inclusions in SNCM439 specimens using the USF-2000A ultrasonic fatigue testing system and observed the inclusions and identified their elements using the EPMA-8050G electron probe microanalyzer (hereinafter referred to as EPMA).

May 28, 2018 GMT