Hot tearing in extruded brass for machining applications
DOI:
https://doi.org/10.3989/revmetalm.0907Keywords:
Brass, Extrusion, Hot tearing, FailureAbstract
Hot tearing failure in 101-mm rods in a direct 20 MN Schlömann press was studied. After the fracture, a zone of fine tearing was observed in the area of the rods with the highest temperature. These fine cracks run in the direction of extrusion and obviously strongly reduced the air and water-tightness properties of the rods. The failure under study appeared in the last stage of solidification, in the temperature range close to the solidus line, which produces an insufficient capacity in the material to absorb tension. Lead condensation, which is the product of a heterogeneous distribution of temperature, is the source of the cracks observed in the rods. Nevertheless, the high temperature of the billet and the low ram speed of extrusion are the main parameters of the failure under study. To avoid this failure, the following is recommended: lower the temperature of the billet to between 660-680 °C and increase the extrusion ram speed to 40 mm/sec. to reduce the extruded die-rod contact time.
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References
[1] G. Pantazopoulos and A. Vazdirvanidis, J. Fail. Anal. Prevent. 8 (2008) 218-222. doi:10.1007/s11668-007-9084-7
[2] G. Pantazopoulos, J. Fail. Anal. Prevent 4 (2003) 14-22.
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Published
2009-12-30
How to Cite
Mannheim, R., & Garin, J. (2009). Hot tearing in extruded brass for machining applications. Revista De Metalurgia, 45(6), 432–438. https://doi.org/10.3989/revmetalm.0907
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