Role of Metallography in a Failure Investigation

D Turnquist, M Stevenson
2011 Microscopy and Microanalysis  
When performing failure investigations, the initial appearance of bulk, physical evidence can dictate the ensuing steps undertaken in laboratory analysis. In this case study, macroscopic and microscopic examinations of two wheel bolts, shown in Figure 1 , clearly indicated that the mode of failure was fatigue. Often, a significant amount of time is spent looking at the fracture surfaces under a stereomicroscope or in a scanning electron microscope in an attempt to determine the cause, while
more » ... he cause, while many more fundamental techniques are ignored. In this investigation, metallography played a key role in determining the root cause of failure.
doi:10.1017/s1431927611009639 fatcat:2jb2yxg3cjf35gcfef73i5r2di