Optimization of Composition and Heat Treating of Die Steels for Extended Lifetime Page: 51 of 121
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occurring along the circumferencial radius of the cavity, and is more pronounced across
the gates in the region indicated by the arrows in Figure 7.6.
An attempt was made to quantify the heat checking damage utilizing a similar
procedure as employed in the immersion thermal fatigue test at CWRU. Aluminum parts
cast in each insert were made available after 59,000 and 90,000 shots. The heat checking
damage provides a positive image of the cracks, or fine fins along the perimeter. The
testing procedure shown in Figure 7.7 was utilized. It comprises a rotary table with an
attached indicator. The tip of the indicator has wedge shape and can follows the shape of
the fins. By rotating the table, a profile of the fins was generated with their respective
height and length. In most cases the fins are not continuous but short segments.
A typical profile is shown in Figure 7.8. By integrating the area of the fins (length x
height) for 80 each part, a "Total Crack Area" value was generated, similar to the one
used in the CWRU test as shown in Figure 7.9. This value is plotted versus the number of
shots, and allows a comparison between parts of identical geometry. In this case, at
59,000 and 90,000 shots, the total crack area for the KDA1 inserts is larger than the total
crack area for the H13 inserts. These results are not final; the inserts were still in
production at the time of this writing.49
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Schwam, David; Wallace, John F. & Zhou, Quanyou. Optimization of Composition and Heat Treating of Die Steels for Extended Lifetime, report, January 30, 2002; Cleveland, Ohio. (https://digital.library.unt.edu/ark:/67531/metadc742078/m1/51/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.