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A. K. Das, B. M. Thippeswamy, J. Prasad
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Walter L. Bradley
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Fe-0.3C
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Book Chapter
Torsional Fatigue Failure of Crane Shaft
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001468
EISBN: 978-1-62708-221-1
... were found in all the shafts. Timely replacement was possible and the likelihood of serious accidents removed. Shafts (power) Ultrasonic testing Fe-0.3C Fatigue fracture This case concerns the failure of a shaft which resulted from reversed torsional stresses. The effect of this different...
Abstract
In a shaft subjected to reversed torsional stresses, failure resulted from the gradual development of fatigue cracks from opposite sides of the shaft. These broke out from origins located adjacent to the fillets at the start of the square section. The remaining uncracked material which fractured at the time of the mishap was in the form of a narrow strip, situated slightly to one side of the center of the shaft. The material was a mild steel in the normalized or annealed condition, having a carbon content of approximately 0.3%. The cracking was characteristic of that resulting from torsional fatigue. Because it occurred on two different planes at 45 deg to the axis of the shaft it was due to reversals of torsional stress rather than fluctuations of unidirectional torque. Following this failure, the shafts of six other similar cranes were tested ultrasonically. Cracks to varying degree were found in all the shafts. Timely replacement was possible and the likelihood of serious accidents removed.
Book Chapter
Cracking of High Strength Steel Piston Rod During Chrome Plating
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001556
EISBN: 978-1-62708-218-1
... was attributed to hydrogen embrittlement that occurred during chrome plating. Chromium plating Piston rods Residual stress Fe-0.3C-3.0Cr-0.4Mo Hydrogen damage and embrittlement Surface treatment related failures A few Cr-Mo (C 0.3%, Cr 3.0%, Mo 0.4%) steel piston rods from different production...
Abstract
A few Cr-Mo steel piston rods from different production batches were found identically cracked in the eye end near the radius after chrome plating and baking treatment. Two of them cracked in the plating stage itself instantly broke on slight tapping. Cracking initiated from the outer base surface of the forked eye end. The 40 mm diam forged piston rods were subjected to plating after heavy machining on the part without any stress-relieving treatment. Also, time lapses between plating and baking were varied from 3 to 11 h. The brittle cracking along forked eye-end radius portion was attributed to hydrogen embrittlement that occurred during chrome plating.
Book Chapter
Application of Fracture Mechanics to Pipeline Failure Analysis
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001148
EISBN: 978-1-62708-228-0
... the existence of a very hard spot in the steel prior to the explosion, which was softened significantly in the ensuing fire. This finding allowed the micromechanism leading to fracture to be identified as hydrogen embrittlement resulting from cathodic charging. Fracture mechanics Gas pipelines Fe-0.3C...
Abstract
A natural gas pipeline explosion and subsequent fire significantly altered the pipeline steel microstructure, obscuring in part the primary cause of failure, namely, coating breakdown at a local hard spot in the steel. Chemical analysis was made on pieces cut from the portion of the pipe that did not fracture during the explosion and from piece 5-1 which contained the fracture origin site. Both pieces were found to have 0.30% carbon and 1.2% Mn with sulfur and phosphorus impurities acceptably low. Fracture mechanics analysis used in conjunction with fractographic results confirmed the existence of a very hard spot in the steel prior to the explosion, which was softened significantly in the ensuing fire. This finding allowed the micromechanism leading to fracture to be identified as hydrogen embrittlement resulting from cathodic charging.