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Failure Analysis – Service Problems

Intergranular SCC in 4340 Alloy Steel

Aqueous saturated picric acid, with 1% HCl and a wetting agent, Nacconol
90G, at 80°C revealed the prior-austenite grain boundaries. The hardness was too high, 35-38 HRC, making the steel sensitive to Cl-ion stress- corrosion cracking.

SCC Failures of ASTM A325 Bolts in the Piscataqua Bridge

Fracture appearance of a typical failed bolt; arrows point to the origin at the surface. There is some corrosion on the surface (3x, 6x)


The articles and presentations that can be down-loaded from this web site are based upon work done by GFV while employed at Bethlehem Steel (1967-1983), Carpenter Technology (1983-1996), Buehler Ltd. (1996-2009) and Struers (2009-Present) and from the authors consulting work for companies such as, Latrobe Steel, Scot Forge, etc., and from his litigation work. GFV's bylined articles appearing in various issues of the ASM Handbook series have been listed here courtesy of ASM International, Materials Park, Ohio.