Engine Titanium Consortium - Center for Nondestructive Evaluation ...

Forging Calibration Standard #1
1.75"
.300"
7.0"
0.216
.300"
1.156"
holes drilled .156" deep
02/13/2002
Figure 1. One of the four blocks comprising the set of calibration standards for zoned forging
inspections.
Analysis of supplier capability to create FBHs was tested with the sample of 2” cube material made
from powder Ti-6-4. Several attempts at analyzing the condition of the holes was presented in
earlier reports that included replication and laser profilometry analysis. During this reporting period,
GE has carried out metallographic analysis of the holes to complete the evaluation. The analysis
was completed in 2 steps. First, the block was ground to a thickness that is 5 to 10 mils above the
bottom of the hole. This view allowed measurement of the roundness of the hole including focus to
the bottom of the hole. The second step consisted of transverse polishing to evaluate flatness of
the bottom of the hole. Figure 2 shows a representative example of the analysis that was
performed on several holes that were produced by 2 suppliers. The result of this analysis is that
the 2 suppliers that made FBHs for this study are equally capable of providing the features that
were requested. One of the suppliers is able to provide smaller holes with their equipment.
Historically, only one of the suppliers was used for calibration standards and this study shows that a
second supplier is also capable.
Quarterly Report – January 1, 2002 –March 31, 2002
print date/time: 6/6/2002 - 8:39 AM – Page 58