Modified Steels for Cold-Forming U-Bolts Used In Leaf Springs Systems

In this work, a low alloy steel and a fabrication process were developed to produce U-Bolts for commercial vehicles. Thus, initially five types of no-heat treated steel were developed with different additions of chrome, nickel, and silicon to produce strain hardening effect during cold-forming proce...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2009-10, Vol.18 (7), p.903-911
Main Authors: Ventura, J.M., Castro, D.B.V., Ruckert, C.O.F.T., Maluf, O., Bose Filho, W.W.B., Spinelli, D.
Format: Article
Language:English
Subjects:
Alloy steels
Characterization and Evaluation of Materials
Corrosion and Coatings
Electronics
Engineering Design
Fatigue (materials)
Fatigue tests
Materials Science
Mechanical properties
Microstructure
Quality Control
Reliability
Safety and Risk
Structural steels
Tribology
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Summary:In this work, a low alloy steel and a fabrication process were developed to produce U-Bolts for commercial vehicles. Thus, initially five types of no-heat treated steel were developed with different additions of chrome, nickel, and silicon to produce strain hardening effect during cold-forming processing of the U-Bolts, assuring the required mechanical properties. The new materials exhibited a fine perlite and ferrite microstructure due to aluminum and vanadium additions, well known as grain size refiners. The mechanical properties were evaluated in a servo-hydraulic test machine system—MTS 810 according to ASTM A370-03; E739 and E08m-00 standards. The microstructure and fractography analyses of the cold-formed steels were performed by using optical and scanning electronic microscope techniques. To evaluate the performance of the steels and the production process, fatigue tests were carried out under load control (tensile-tensile), R  = 0.1 and f  = 30 Hz. The Weibull statistic methodology was used for the analysis of the fatigue results. At the end of this work the 0.21% chrome content steel, Alloy 2, presented the best fatigue performance.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-008-9314-5