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A D V A N C E D
M A T E R I A L S
&
P R O C E S S E S |
A P R I L
2 0 1 6
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tempered at 400°-500°F (low temper-
ing) or 1000°-1200°F (high tempering).
ASTM standard tensile tests show the
following room temperature properties
after several heat treatments.
Group 1 specimens feature ul-
timate tensile strength (UTS) of
140-150 ksi, yield strength (YS) of 130-
140 ksi, and elongation of 14-16% af-
ter gas quenching and high tempering;
microstructure consists of ferrite and
fine carbides. Group 2 exhibits UTS of
170-180 ksi, YS of 160-170 ksi, and elon-
gation of 10-12% after gas quenching
and high tempering at a temperature
slightly lower than Group 1; micro-
structure consists of ferrite and fine
carbides. Group 3 shows UTS of 260-
265 ksi, YS of 190-195 ksi, and elonga-
tion of 8-9% after gas quenching and
low tempering; microstructure consists
of small packets of martensite laths, re-
tained austenite, and fine carbides. De-
velopment of HSCS steel sheet with UTS
of 200-220 ksi and elongation of 14-16%
is now in progress. For more information:
Gregory Vartanov, 289.400.1154,
, .
to automotive OEMs and suppliers.
Depending on membership level, ben-
efits may include meeting attendance,
reports, and royalty-free access to in-
tellectual property, as well as project
selection rights. .
NEW STEEL SHEET AVAILABLE
FOR COLD STAMPING
Many of today’s automotive OEMs
use hot and cold rolled high and ultra-
high strength steel sheets for cold
stamping with strengths of 140-180 ksi
and elongation of 11-18%. Newly de-
signed high strength steel sheets for
cold stamping (HSCS steel) from Ad-
vanced Materials Development Corp.,
Toronto, now offer an alternative to
these steels for automotive, defense, oil
and gas, and construction applications.
Ingots of the HSCS steel were air
melted in an induction furnace, ho-
mogenize annealed, and hot rolled to
0.060-0.065-in. thick sheets, 16-18 in.
wide. After annealing, ASTM standard
tensile specimens were cut in the longi-
tudinal direction. Specimens were heat
treated by gas quenching and further
SwRI engineers are leading the AHEAD
consortium, which seeks to reduce
weight and improve durability of alumi-
num cylinder heads. Courtesy of SwRI.
engines. AHEAD will target areas such
as casting processes, structural design,
measurement and prediction of resid-
ual stresses, and aluminum alloy ma-
terials that resist high temperatures.
More advanced projects could include
new alloy development, cylinder head
transient analysis, and materials char-
acterization. The four-year program
will launch this summer and is open