Causes of damages to fan blades of the generator of a steam turbine

Krutsan, H. M.; Zdanovs'kyi, V. H.; Karvats'kyi, L. M.; Khoma, М. S.

doi:10.1007/bf02539093

Cited by 1 publication

(2 citation statements)

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“…The calculation for the onset of environmentally assisted cracking, or K IEAC , was derived as follows for cantilever bending from the four-point bending expression: [3] in which M IEAC = the applied moment necessary to induce cracking, B = the specimen thickness, W = the specimen depth, and a = the initial crack length. [4] in which f(a/W) varies between 2.3 and 3.2 for a/W values between 0.45 and 0.55, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…This deleterious effect of hydrogen on high strength material by the environment is typically referred to as environmentally assisted cracking (EAC). Failures of military grade steels with cadmiumcontaining coating systems have been reported extensively in the literature (2)(3)(4)(5)(6)(7). Since all substrates reach equilibrium in the environment (in terms of pH and electrochemical potential) with their respective coating systems, it would be extremely beneficial to know the optimum pH and electrochemical potential where the tolerance of the high strength material to EAC is at the maximum level.…”

Section: Introductionmentioning

confidence: 99%

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Environmentally Assisted Cracking: Concerns for Cadmium Replacement

Grendahl¹

2003

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)December 2003 ARL-TR-3099 SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTRecently, cadmium replacement has become the topic of an Environmental Security Technology Certification Program. As a direct result of this program, replacement coating systems will be developed and scrutinized. A fundamental starting point for corrosion-resistant coatings development work consists of a target for the overall chemical potential (galvanic series) and pH of the coating system and the substrate. This work developed the data necessary to determine the target for several high strength steels. Hydrogen is widely recognized as having a detrimental embrittling effect on high strength materials, especially high strength steel. Many of these materials show a strong dependence of hydrogen on chemical potential and pH. This work focused on determining the effect of hydrogen on the environmentally assisted cracking critical stress intensity values (K IEAC ) for several common high strength structural steels. Evaluating the effects of hydrogen on K IEAC over a range of chemical potential and pH will make the optimum chemical potential and pH evident for each material. It then becomes possible for the coating system designers to tailor a prospective coating system around those optimum values with the various substrates. If a system were designed at the optimum values for chemical potential and pH, the substrate material would be at the most tolerant conditions for resisting detrimental hydrogen effects, regardless of the source of the hydrogen. SUBJECT TERMScritical stress intensity electrochemical potential environmentally assisted cracking (EAC) high strength steel PH 13-8 Mo steel 4335 steel vacuum arc remelt (VAR) steel SECURITY

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%