Sally Fitzgibbons Foundation

Beginning the Academic Essay

The thermal fatigue of steel die casting dies becomes more severe at higher operating service temperatures, reducing die life significantly. Consequently, to extend die life, die design has to address efficient cooling methods. A key issue in this respect is the size and location of cooling lines relative to the surface of the die. This subject was studied in detail, to elucidate the effect of die temperature on thermal fatigue cracking. The investigation correlates the thermal fatigue cracking in an immersion test specimen with the temperature attained near the surface and the corresponding softening of the steel. The effect of cooling line location vis-à-vis the surface temperature and the resulting cracking pattern are shown for various immersion times and different sizes of cooling lines. Higher temperatures induce faster and deeper softening of the steel leading to more thermal fatigue damage. Die design with cooling lines close to the surface can reduce this damage significantly.
Since the thermal fatigue test has previously provided a remarkably accurate prediction of the relative thermal fatigue cracking, these results should have good applicability in die casting operations.
Experimentally above thermal fatigue crack test can be adopted to the specimens of AISI H13 category by varying the coolant location. Experiment result evaluated co relatively to the analysis results and optimize the parameters. The main objective is to prolong the formation of thermal cracks on die and to increase the die life.

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