Engine Titanium Consortium - Center for Nondestructive Evaluation ...

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and end of zone) were analyzed from the c-scan data. For the zone 4 transducer, targets were at 3.15”, 3.6” (center and end of zone). In each case, there was some lateral banding of the noise pattern, so regions of noise in the highest and lowest bands were analyzed and are shown separately on the plots. Figures 5 and 6 show the target amplitudes and noise amplitudes for zones 2 and 4 that the zone 4 transducer was not capable of performing inspection of the material in the calibration standard to a 1/64 inch FBH sensitivity. The noise level in the high noise band was marginally above the amplitude of the 0.4 mm (1/64 inch) target at the deep end of the zone. We consider that a 3dB margin is required between the noise and the target amplitude in order to achieve the inspection sensitivity. Review of the measured frequency performance, and the manufacturer’s reported measurements also showed that the transducer had frequency significantly lower than specified (measured at 6.02, 6.25, and 6.35 MHz, versus lower specification limit of 7.0 MHz). The transducer was returned to the manufacturer. The zone 2-transducer appeared marginally capable of meeting the required sensitivity. It showed a difference of 2.8 dB between the noise and the lowest target signal, versus the 3dB requirement. There is a concern that the measured bandwidth was lower than specified (48% versus lower spec limit of 60%), and the manufacturers reported measurement of frequency was only 6.33 MHz. Based on the data of Figures 5 and 6, a decision was made to pursue development of transducers designed with the larger F/8 aperture. Note that the original plan was to purchase sets of transducers with both F/10 and F/8 aperture size. The smaller F/10 transducers reported above were purchased with the intent of making the final decision on aperture size based on the results of their evaluation. Figure 5. Noise and target amplitude responses, zone 2 transducer. Quarterly Report – January 1, 2002 –March 31, 2002 print date/time: 6/6/2002 - 8:39 AM – Page 29
Figure 6. Noise and target amplitude responses, zone 4 transducer. Specified Reported by manufacturer Measured on #2FBH, 1.35” deep in Inconel 718 Center freq (MHz) 7.5 ± 0.5 6.33 7.1 Lower – 6 dB freq (MHz) 5.4 Upper – 6 dB freq (MHz) 8.8 Bandwidth (MHz) 3.4 Bandwidth (%) ≥ 60 68 48 Pulse duration (µS) 0.21 Table 1. Frequency Measurements for Zone 2 Transducer. Quarterly Report – January 1, 2002 –March 31, 2002 print date/time: 6/6/2002 - 8:39 AM – Page 30
Page 1 and 2: Engine Titanium Consortium Quarterl
Page 3 and 4: Project 1: Task 1.1: Subtask 1.1.1:
Page 5 and 6: findings for the first billet studi
Page 7 and 8: measured P(L) curve, and tabulate t
Page 9 and 10: 1.2 1.0 0.8 V-DIE-A coupon "D" (axi
Page 11 and 12: Attenuation (dB/in) . Waspalloy Att
Page 13 and 14: Deliverables: Fundamental propertie
Page 15 and 16: Small Diameter Billet Assessment: A
Page 17 and 18: Under normal circumstances one woul
Page 19 and 20: Plans (April 1, 2002 - June 30, 200
Page 23 and 24: system will be at GE, and evaluatio
Page 25 and 26: fixed-focus transducers that were n
Page 27 and 28: Back-Wall Scan FBH scan 20% 57% 49%
Page 29: 63% Back-Wall Scan 74% FBH scan 58%
Page 33 and 34: Original Date Revised Date Descript
Page 37 and 38: Objective/Approach Amendments: Obje
Page 39 and 40: (a) Transducer is: 15 MHz 0.5”-Di
Page 41 and 42: FOM (std. units) 0.20 0.18 0.16 0.1
Page 43 and 44: Peak> Range of Ave. Range of Peak G
Page 45 and 46: The average noise characteristics,
Page 47 and 48: Noise C-scans through the “Flat S
Page 49 and 50: 4.0” Convex Block; Flat Side Insp
Page 51 and 52: % FSH Noise Measurements from flat
Page 53 and 54: Original Revised Description Status
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Page 59 and 60: Forging Calibration Standard #1 1.7
Page 61 and 62: Surface Finish Studies The plans fo
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Page 67 and 68: phased array instruments. The desig
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include air drying, oven drying, an
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aluminum oxide blasting is conceali
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Original Date Revised Date Descript
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Project 3: Task 3.1: Subtask 3.1.1:
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the methodology. These may be thoug
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model parts across 17 micrograph pl
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Z Y X Figure 4. Angle View of Void
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A report documenting the relative e
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naturally occurring flaws in forgin
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Milestones: Revised dates of TBD ar
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7a-7l 6 8 9 10 Key additional ingre
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incorporating the results of the pr
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