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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2013

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Effect of microstructural banding in hot-work tool steel on thermal expansion anisotropy

Pawłowski B., Bała P., Dziurka R., Krawczyk J.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 56, nr 1

14--19

Purpose: The objective of the present work was to study the effect of the microstructural banding on the thermal anisotropy of hot-work tool steel used for die for aluminium alloy die-casting. In particular, the major purpose of this research was to find possible correlation between geometrically oriented thermal expansion coefficient values and the presence of number of parallel cracks on the working surface of die. Design/methodology/approach: The studies were performed on the specimens which were cut from the failed prematurely die along the three axes of the coordinate system (X-axe was parallel to the cracks direction). Macroscopic, metallographic, SEM and dilatometric examination were made. Findings: Surface cracks of die are parallel to the microstructural banding orientation. Differences in the values of thermal expansion coefficient determined along the three axes of the coordinate system probably promote cracks propagation direction. Research limitations/implications: Studies were performed on the single prematurely failed die for economic reason. This work findings should be compared to the similar examinations results obtained for the another failed dies. Practical implications: The incorrect microstructural banding orientation of the die core and related differences in the values of thermal expansion coefficient promote crack propagation. Originality/value: This show the relationship between microstructural banding and the thermal anisotropy of hot-work tool steel used for die for aluminium alloy die-casting.