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Failure during fabrication of clamps of Mn-alloyed steel for springs in heavy vehicles

2019; Elsevier BV; Volume: 109; Linguagem: Inglês

10.1016/j.engfailanal.2019.104244

1873-1961

Sérgio Souto Maior Tavares, Juan Manuel Pardal, Rodrigo Vieira Landim, Cássio Barbosa, F.C.S.C. dos Santos, André Rocha Pimenta,

Metal Forming Simulation Techniques

Clamps or "U" bolts for springs in heavy trucks made of SAE 1552 C-Mn steel presented cracks during the fabrication process by flattening and bending. The cracks initiated in the external face of curves bended, where the tensile stress was maximum. The surface of cracking showed a large portion of brittle fracture by cleavage. The microstructure consisted of fine pearlite (major part), pro-eutectoid ferrite and traces of bainite. The bar used to fabricate the clamps were probably hot rolled and air cooled, resulting in a material with only 1.3% of uniform deformation in the tensile test. This study shows that the bars should have been quenched and tempered at around 600 °C, in order to provide higher workability to the flattening and bending processes, and improve mechanical properties for service.