Engine Titanium Consortium - Center for Nondestructive Evaluation ...

OEMs and the forging industry. A final report summarizing the results of the technical effort and the
final factory demonstration will be written in the required FAA format.
Objective/Approach Amendments: Objective and approach remain as originally proposed in July
1998.
Progress (January 1, 2002 – March 31, 2002):
Significant progress was made towards the goal of achieving #1/2 FBH sensitivity in Ti-6-4 forgings.
Progress was made in both defining the inspection parameters and the supporting tasks of creating
calibration standards and defining surface condition requirements with additional details provided
below.
Calibration Standards
The team agreed on a final design for the standards that will make them more generic rather than
useful for a single inspection scenario. Initially, the standards were to reflect the requirements of
the three OEM forgings to be used in this program. The zones that were initially defined were from
the inspection of these three forgings and are dependent on the noise in the coupons made from
sample forgings. The team agreed it would be a mistake to create the calibration standards just for
zones defined for those samples. Instead, the standards will have FBHs placed at fairly fine
increments, 0.05”, so that zones can be defined and setups made for a variety of zone depths for a
range of forging geometries.
Four blocks will be required to accomplish 0.05” steps to a depth of 4.0”. The first depth, however,
will be at 0.06” to meet current near surface setup requirements. The second hole depth is at 0.10”
and all subsequent hole depths are at incremental depths of 0.05”. The design of the first block is
shown in Figure 1. GE has had all 4 blocks machined with the steps and plans are in place to have
the FBHs drilled. The completion of the standards is expected to be within the revised milestone
date of month 36.
Quarterly Report – January 1, 2002 –March 31, 2002
print date/time: 6/6/2002 - 8:39 AM – Page 57