If I could enter this discussion, I might point out that the parts you are using as examples of failure that need magnifluxing, are MOST PROBABLY "forged" parts, not cast.
I spent 15 years as a "Hot Forging Inspector" at the Chevrolet Tonawanda Forge checking for flaws in the forgings that we made. They usually were caused by worn dies that created some type of overlapping of steel during the multiple hammering stages of forging, and some were not visible after the proceedure was done. All these parts ultimately went thru an industrial magniflux process to check for internal flaws before release to the machining process.
Parts made that I was responsible for inspecting were connecting rods, spindles, crankshafts, gear blanks, axle shafts, and steering components...tie rod ends, connecting links, and pitman arms.
Forgings are usually visually identifiable by the characteristics of the trimming of the flash (material squeezed out of the die/mold). Usually molds leave a very narrow flash line and dies, because of the constant wear, leave very wide flash lines. They are recognizable by the thickness of the visible trim line.
Just a little trivia.
Good racing.
Bill
Bill Frieder
MGP Racing
Buffalo, New York
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