High Temperature Properties And The Crack
Susceptibility Of New Steel Grades For
Automotive Purposes
Author(s)
G. Gigacher, R. Pierer & C. Bernhard
Abstract
The use of new high-strength steels with good plasticity in automobiles offers a
remarkable potential for improvements in the area of weight reduction with
simultaneous improvement in crash-safety. For the steel industry, this trend to
highly-alloyed, high-strength steels means a considerable potential for
metallurgical research. Continuous casting in particular appears to be a big
challenge for such steels. The focus of the investigations documented here are:
high temperature properties, crack behavior, non-metallic inclusions and
segregation effects in new lightweight steels with induced plasticity (LIP). It is
possible to investigate these, especially the high-temperature properties and the
crack susceptibility, using the SSCT (submerged split chill tensile) test.
Preliminary results for these steels show higher crack sensitivity due to the
micro-segregation behavior and non-metallic inclusions, which are crack
initiators. In addition, the high-temperature strength of these new steel grades is
significantly higher than that of common steel grades. For a better understanding
of the experimental results, a numerical model of the SSCT test was used. Due to
a lack of documented high-temperature properties of these new steel grades, e.g.
elasto-plastic parameters, the comparison of experimental and computational
results gives a first approximate indication of these important high-temperature
parameters. Knowledge of the high-temperature mechanical properties and crack
sensitivity provides an important basis for the development of industrial-scale
production processes for these new steel grades using the continuous casting
process.
Keywords: high-temperature properties, non-metallic inclusions, LIP steels.
Keywords
high-temperature properties, non-metallic inclusions, LIP steels.
Related Book
Other papers in this volume
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