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Liquid Metal Cracking Fracture Analysis
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QBM is a Mechanical Engineer, Metallurgical Engineer, Materials Engineering Consultant with world-class expertise in failure analysis, metallurgical and mechanical engineering, metal and part manufacturing, service condition effects, limited information interpretation, and results presentation to non-metallurgists
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The last few paragraphs in stainless steel texts may mention that certain liquid metals can cause small intergranular cracks under limited circumstances. Depending upon the entire situation, the original small intergranular portion may be concealed in a larger subsequent fracture. If one only looks at the major portion of the fracture the ductile over load or fatigue like appearance of the majority of the fracture becomes the final diagnosis. This results in an erroneous conclusion.
The expert is skilled in examining the entire fracture surface so that such keys are found. With proper care in a Scanning Electron Microscope one may find the small drop of copper that was the real culprit. The expert is also skilled in reviewing the prior processing to determine where the contamination occurred. The levels of contamination can be quite small. Experience has found solutions in seemingly trivial events as tubes rolling over copper bearing screws supporting wooden rails. The screws were originally counter sunk but with wear, tubes contacted the copper. Other, more obvious sources include welding clamps, often made of copper for good heat transfer.
Read other articles by this KKAI Associate:
Welding In Producing Mill Environments
| Mechanical Engineer, Metallurgical Engineer, Materials Engineering Consultant, failure analysis, metallurgical and mechanical engineering, metal and part manufacturing, service condition effects, limited information interpretation, and results presentation to non-metallurgists | |
| Resume of QBL | metallurgical engineer, engineering, research engineer, engineering failure analysis, accident reconstruction consultant, specialist, forensic investigation, expert witness testimony, engineering consulting services |
| Resume of UQL | mechanical engineer, ceramic scientist, technology manager, engineering failure analysis, accident reconstruction consultant, specialist, forensic analysis investigation expert, patent infringement, expert witness testimony, engineering consulting services |
| Resume of ALD | metallurgist, foundry consultant, cast metals consultant, engineering failure analysis, accident investigation, accident reconstruction, specialist, forensic analysis investigation expert witness testimony, engineering consulting services |
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Rapid Response Engineering® Solutions
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