Effect of bulk die temperature on die cavity surface strains in thixoforming of steels

Author: Birol, Y.

Source: Ironmaking & Steelmaking, Volume 36, Number 5, July 2009 , pp. 397-400(4)

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Abstract:

The principal failure mechanism in thixoforming dies is expected to be thermal fatigue, as the mechanical loading on tooling is modest owing to a semisolid feedstock. High process temperatures during steel thixoforming induce high compressive strains at the die cavity surface during slurry injection. The magnitudes of the thermal gradient and strains that develop on the cavity surface are directly linked with the temperature of the die surface immediately before slurry injection. An increase in die bulk temperature from 450 to 550°C reduces the surface to interior temperature differential and thus the surface strains by as much as 30%, a very favourable effect from thermal fatigue point of view.

Keywords: THIXOFORMING; TOOLING; STEELS

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328109X410316

Affiliations: Materials Institute, Marmara Research Center, TUBITAK, Kocaeli, Turkey

Publication date: 2009-07-01

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