Transactions of Materials and Heat Treatment

Title：Failure analysis on forged aluminum control arm

Authors：

Unit：

KeyWords： forged aluminum control arm failure mechanical property fracture folding defects

ClassificationCode：TG316

year,vol(issue):pagenumber：2021,46(6):72-76

Abstract：

Forged aluminum control arm was used on a certain kind of vehicle and fractured during offline road test procedure, and the physical and chemical performances of material and the forming process of part were analyzed by optical emission spectrometer, electronic universal testing machines, metallographic microscope and other equipments, as well as simulation analysis software CAE. The results show that the chemical compositions and tensile properties of material meet the related technical requirements. The metallographic structure of part has no heat treatment overburning phenomenon. But there are obvious forging defects inside the part. In the forging process, due to the inaccurate positioning of bending process, the folding defects are generated resulting in the fracture and failure for the control arm. Furthermore, by adding positioning baffles and adjusting bolts in the bending process of forging to control the spacing between pre-bending blank and positioning point within 5 mm, the generation of forging defects of forintg is effectively avoided, and the outflow of defective parts can be prevented by surface fluorescence permeation detection of all parts in the quality inspection process of part.

Funds：

袁超(1988-)，男，硕士，中级工程师 E-mail：yuanchao2@geely.com

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