I have a part made of Titanium that is peened with AWCR-14 to intensity range of .010-.015N” with 100% coverage.
We have been experiencing a phenomenon were small areas of the part are not being covered. The areas area full within the stream of peening media exiting the nozzle. There is no masking in or near the area. Visual inspection of the part under both white and black light reveal no foreign material on the part prior to shot peen. When we coat the part with a tracer dye all of the tracer is removed yet these isolated areas (approximately .125” diameter) remain un-peened and appear to be nearly black in color. Is it possible for Ti to have isolated areas that are harder than the remainder of the part?
Has anyone ever experienced this before?
