Volume 12 - Fractography Part 10 pdf

Fracture features in zone II of fractograph of SAE 5160 leaf spring Fig.. SEM, 10,000× General Motors Research Laboratories... Fracture features in zone II of fractograph of SAE 5160 lea

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Fracture features in zone II of fractograph of SAE 5160 leaf spring (Fig 482 and 483) Fig 487: SEM, 300× Fig 488: Enclosed area in Fig 487 SEM, 1000× Fig 489: Enclosed area in Fig 488 Note numerous fine microvoids (dimples) SEM, 10,000× (General Motors Research Laboratories)

Fracture features in zone II of fractograph of SAE 5160 leaf spring (Fig 482 and 483) Field differs from that in Fig 487, 488, and 489 Fig 490: SEM, 300× Fig 491: Enclosed area in Fig 490 SEM, 1000× Fig 492: Enclosed area in Fig 491 SEM, 10,000× (General Motors Research Laboratories)

Fracture of brake spring due to seam defect in material The AISI 5160H wire was drawn to 155 mm (0.531in.) in diameter, hot wound, and quenched and tempered to 48 to 52 HRC Fig 493: Fractured brake spring Note smooth, longitudinal split caused by seam Actual size Fig 494: Close-up of one fracture face 2× (P.W Walling, Metcut Research Associates, Inc.)

Fatigue failure of AISI 5160 initiated by ribbonlike inclusions Fig 495: Secondary electron image of fracture surface Ribbonlike inclusion is near the center SEM, 40× Fig 496: Backscattered electron image of field in Fig 495 brings out details of fracture surface and enhances visibility of inclusion SEM, 40× Fig 497: Ribbonlike inclusions are revealed on the wall of this longitudinal crack associated with a fatigue fracture in AISI 5160 SEM, 75× (J.H Maker, Associated Spring, Barnes Group Inc.)

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