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Hi MagBen On the polished and etched sample at 2k magnification, the microstructure consists of inclusions with spherical and elongated morphologies. I did EDX point analysis on these inclusions. Some of the inclusions only had peaks corresponding to Mn and S. Hence, the conclusion that these...

Hi mrfailure, I did some EDX on the polished samples at 20kV and there were no any Mo peaks. The Mn and S are coming from the inclusions (MnS?) in the ferritic-pearlitic microstructure of the steel. No welds are present, and the intergranular crack shown in the microscopy image above is...

To learn more about valve parts and related topics, try different ways of learning. Take classes or workshops about valves. You can also learn online with websites like LinkedIn, YouTube, Coursera or Udemy. Many handbooks and technical guides are available online and can be helpful too...

The way metal deforms plastically is mainly influenced by the movement of dislocations within its crystal structure. It's widely accepted that the yield stress of metallic materials increases as the dislocation density increases. However, during reverse cycle loading, dislocations within the...

If we neglect the C and O in EDX analysis, it is ~99% Fe and rest is Mn and S, with higher S wt%

Hello guys, I now have a cleaned and improved ish macro image of the fracture surface, as well as a through-wall mount showing the fracture surface. Several intergranular cracks similar to the one in the last image were found but there were not branched (No stress corrosion cracking?? But can...

Hello btrueblood , Top and sideview of the fracture face is as below ;

No evidence of corrosion is present, but the microstructure in region A resembles intergranular facets. Does this indicate fatigue failure, with crack initiation possibly attributed to impurity element segregation or hydrogen-induced embrittlement? Also, the absence of fatigue striations means a...

Hello mrfailure, Tbh, I'm curious about how we can correlate microscopic features to different failure modes. This part has been on my desk for a while, so I lack enough information related to its service life and operational conditions. But, I'm confident it's related to a hydraulic system in...

Annealed SS (considering the hardness ~136HV).

Hi EdStainless, Thickness of the tube is ~2.5mm, the material is stainless steels, and loading was <400 N/mm^2 (tensile)

Could someone assist me in identifying the failure mode of the following thin-walled tube Microscopic images of locations A, B, and C (x1000) of the fracture surface as attached. I'm attempting to interpret the failure mode. 1. Thin-walled tube ...