Engine Titanium Consortium - Center for Nondestructive Evaluation ...

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The etch study was repeated during this visit at Delta for both Ti-6-4 and INCO 718. There were difficulties in blending the Ti-6-4 and the INCO 178 etch specimens to acceptable conditions for processing through the etchant procedures. It may be somewhat reassuring to note that the cracks were difficult to smear. It was also difficult to determine visually if smearing was sufficient to close the cracks as FPI revealed. The etching of Ti-6-4 had a better effect than etching of INCO718, however crack detectability was significantly lower than the baseline for all samples. The report summarizing this study is being prepared. A considerable volume of data has been generated on this program with analysis underway. A meeting to review the data and conclusions is planned for early April. Final report sections were assigned and drafts have been or are being completed. Plans (April 1, 2002 – June 30, 2002): Complete accounting of all results including crack length measurements from the UV photos, organizing UV images, verification of brightness results and crack lengths and spreadsheet results by cleaning method. A two-day wrap up meeting is scheduled for April 7-8 in Phoenix. This will provide an opportunity to evaluate all cleaning results and document conclusions and recommendations for follow-on work. Further evaluation of some selected specimens with diminished/no brightness will include scanning electron microscopy, a hot water rinse study, and additional fatigue of several specimens to break open closed or smeared cracks followed by penetrant testing. Report preparation is underway with a draft to be provided in the next quarter. Milestones: Original Date Revised Date Description 4/00 Complete literature survey. Complete industry survey of common practices used in cleaning and drying. (All) 5/00 Identify cleaning and drying methods and typical contaminants of concern for study in the problem. 6/00 Establish experimental parameters for engineering studies. 6/00 Define necessary crack samples and determine need for fabrication 6/00 Establish partnerships with airlines to perform onsite evaluation of cleaning methods. 8/00 Initiate study to define optimal local etching practices. 9/00 Present status update at ATA September NDT meeting in San Francisco. (This along with telephone survey replaces proposal milestone for month 3. Industry workshop to identify cleaning and drying methods and typical contaminants of concern for study in the program.) 12/00 Initiate combined Effects of Cleanliness Study and Cleanability & Drying Studies. 12/00 Complete local etching practices study and generate guidance document. Status Completed 4/28/00 Completed 5/8/00 Completed 5/10/00 Completed 6/28/00 Completed 6/28/00 Etch study initiated with OEM etch solution comparison 8/16/00 Complete 9/28/00 at 44 th Annual ATA NDT Forum Specimen completion 2/01; Delta overhaul study 6/01 Etching study completed 2/02; report to be completed 7/02 Quarterly Report – January 1, 2002 –March 31, 2002 print date/time: 6/6/2002 - 8:39 AM – Page 83
Original Date Revised Date Description 12/01 Complete combine Effects of Cleanliness Study and Cleanability & Drying Studies and generate matrix. Status Drying studies completed 6/01; cleaning study complete 2/02 12/01 Initiate best practices document. Final report in progress. Draft to FAA 7/02. 2/02 Complete best practices document and provide recommendations for further study. Final report to FAA in 7/02. Milestone change summary from the Phase II Technical Proposal – Volume I, Task 2.2.3 dated July 10, 1998. 1.) The industry workshop, month 3 (May 2000) milestone was changed in the February 8 kick-off meeting to a status update to the ATA September 12 meeting in San Francisco. It was felt that a month 3 milestone could not provide any input that the OEM experts were not already aware of and also that the subtask had nothing to communicate to the engine overhaul shops at the time. 2.) The experimental design, month 3 (May 2000) milestone was set back one month to June to review contaminates, determine cleaning methods and decide what cleaning methods would be performed on which contaminate type. Until this was determined, the necessary crack samples could not be determined and so this also was set back one month. 3.) The team decided that since the “Effect of Cleanliness Study” was very similar to the Cleanability and Drying Studies, and would at least require crack samples called for in this second study, that the studies be combined. The determination of how clean is clean must include not just surface cleaning, but crack cleanliness also. 4.) Etching practices study will now be completed at the same time as the cleanability and drying studies since the sample rendered unusable in the cleanliness study can be and will be used for the etching practice study. Deliverables: Guidance on an optimal process for local etching practices. Specimen sets as required. Matrices which define the cleaning effectivity vs. typical engine run hardware contaminants, detectability for various cleaning methods, and detectability for various drying methods. Best Practices Document that provides guidance to the OEMs and airlines and will allow for any necessary specification changes. Recommendations for further work such as a formal POD study. Metrics: Improved cleaning and drying processes clearly defined for implementation by the industry as part of FPI used in inspection of critical rotating hardware. Quarterly Report – January 1, 2002 –March 31, 2002 print date/time: 6/6/2002 - 8:39 AM – Page 84
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Engine Titanium Consortium Quarterl
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Project 1: Task 1.1: Subtask 1.1.1:
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findings for the first billet studi
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measured P(L) curve, and tabulate t
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1.2 1.0 0.8 V-DIE-A coupon "D" (axi
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Attenuation (dB/in) . Waspalloy Att
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Deliverables: Fundamental propertie
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Small Diameter Billet Assessment: A
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Under normal circumstances one woul
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Plans (April 1, 2002 - June 30, 200
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Project 1: Task 1.2: Subtask 1.2.1:
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system will be at GE, and evaluatio
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fixed-focus transducers that were n
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Back-Wall Scan FBH scan 20% 57% 49%
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63% Back-Wall Scan 74% FBH scan 58%
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Figure 6. Noise and target amplitud
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