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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 | M A R C H 2 0 1 5
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TECHNICAL SPOTLIGHT
Fig. 3 — AISI 4340 prototype rivets joining press-hardened steel to
6000 series aluminum: (a) no obvious rivet failures and significant
interlock between steel and aluminum sheets, (b) no fractures
along rivet periphery.
(a) (b)
results indicate that the prototype rivets can accommodate
a higher degree of flaring before fractures occur. A bottom
viewof the rivet (Fig. 3b) demonstrates the ability of the rivet
to sustain significant flare without fractures forming. Assess-
ment of alternative alloys including 4340 and other ultra-
high-strength steel alloys is ongoing.
References
1. 2017 and Later Model Year Light-Duty Vehicle
Greenhouse Gas Emissions and Corporate Average Fuel
Economy Standards, Environmental Protection Agency,
National Highway Traffic Safety Administration, Federal
Register, Vol 77, No. 199, p 62623–63200, 2012.
2. J.R. Davis, Dissimilar Metal Joining, Welding, Brazing
and Soldering, Vol 6, ASM Handbook, ASM International,
p 789–829, 1993.
3. R. Truett, A Riveting Tale: How Will Ford Build the
Aluminum F-150, Automotive News, April 28, 2014.
4. X. He, et al., Self-Pierce Riveting for Sheet Materials:
State of the Art, J. Mater. Process Tech., Vol 199, p 27–36,
2008.
For more information: Kip Findley is associate professor,
Colorado School of Mines, Golden, CO 80401, 303.273.3906,
,