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Analysis of sheet steel fracture during deep drawing
Analysis of Sheet Steel Fracture during Deep Drawing (continued)
20 Journal of Failure Analysis and PreventionVolume 5(5) October 2005
Analysis of Sheet Steel Fracture during Deep Drawing
J.L. McDougall, M.E. Stevenson, and K. McKeever
(Submitted June 27, 2005; in revised form August 2, 2005)
Low-carbon steel sheet used for the fabrication of automotive brake components was tearing during
deep drawing. The associated mill certificates revealed that the coil met the specified chemical
composition and mechanical properties. Metallographic evaluation revealed a severe variation with
respect to grain size through the thickness of the steel sheet, as well as a slight segregation of pearlite.
Insufficient temperature during hot rolling in combination with a high coiling temperature resulted in
the observed microstructural gradient. The anisotropic mechanical properties were amplified by the
slight carbon segregation.
Keywords:
JFAPBC (2005) 5:20-25 ? ASM International
DOI: 10.1361/154770205X65972 1547-7029 / $19.00
Introduction
In an effort to stay competitive, many metal
product manufacturers in the United States have
opted for an increased reliance on imported steel.
This change in suppliers provides a challenge to
the materials specification process and can allow
the receipt and use of unacceptable material. The
primary driving force behind the decision to change
suppliers is generally financial. However, financial
savings, while seemingly substantial, can be erased
when unforeseen production failure and material
deficiencies occur. While the quality and capability
of many foreign steel mills meets or exceeds that
of domestic mills, the lack of experience in
supplying material for a specific operation often
translates into the lack of ability to assure the high
quality of steel required for the production process.
Over the past several years, the authors have
observed a significant increase in failures related to
steel quality. Product manufacturers that had rarely
or
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