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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
2
ISBN electronic:
978-1-62708-215-0
Publication date:
1993
Book Chapter

Fatigue Failure of Steering Arms Due to Forging Defects

By
Roy G. Baggerly
Roy G. Baggerly
Kenworth Truck Company
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Published:
1993
Page range:
67 - 70

Abstract

Several heavy truck Cr-Mo steel steering arms in service less than three years fractured during stationary or low-speed turning maneuvers that required power-assisted steering. Metallographic examination of the cracked AISI 4135 arms, heat treated to a hardness of 285 to 341 HB, revealed that fatigue crack initiation occurred from the tip of oxide scale inclusions forged into the U-shaped arm at the inside radius. Corrective action involved redesigning the steering arm to increase the minimum forging radius and reduce the stress level at the inner-bend radius, and reducing the level of power assistance to the wheels to encourage the driver to put the vehicle in motion prior to turning.

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Roy G. Baggerly, 1993. "Fatigue Failure of Steering Arms Due to Forging Defects", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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