Study of Residual Stresses on Flat Surfaces of DIN 51CrV4 Steel in the Stress Shot Peening Process Rassini-NHK Automotive Limited

Format:

Book

Conference/Event

Author/Creator:

Chiqueti, Cleber Michel, author.

Contributor:

da Silva, Fernando Vilanova

de Almeida Benassi, Adriano

de Lima, Alexandre Santana

dos Santos, Marcos

Gomes, Bárbara Miranda

Rolim, José Ronaldo Agostinho

Conference Name:

13th SAE BRASIL Colloquium on Suspensions and Road Implements & Engineering Exhibition (2025-05-14 : Caxias Do Sul, Brazil)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

Compressive residual stresses are very important at fatigue life, therefore this work has an objective to determine compressive residual stresses longitudinally, along a surface, with three levels of deflection causing tensile prestresses on the surface fibers, of 750 MPa, 1100 MPa and 1500 MPa, supported in one support position on the compression side, 150 mm, equidistant from the longitudinal center of the samples, which are made of EN 47 steel (DIN 51CrV4), with dimensions of 15 mm thick, 70 mm width and 1500 mm long. The samples are submitted to quenching, tempering, surface polishing and stress relief processes, with radius of 2500 mm and concavity downwards, and after they are immersed in a tank with mineral and conventional quenching oil compound, then the samples are tempered and the concave surfaces are polished to remove decarburization and took into the furnace to relieve stress caused by the surface polishing process. Next step, the samples are peened, with deflections of 750 MPa, 1100 MPa, 1500 MPa with support distance of 150 mm, in a machine with controlled parameters, to introduce compressive residual stresses on polished surfaces, this process is called stress shot peening SSP. Specimens are extracted to perform a tensile test for metallographic analysis and hardness determination and residual stresses are determined by X ray diffraction, from the surfaces of the samples longitudinally and uniaxially. The compressive residual stress at deflections of 750 MPa, 1100 MPa and 1500 MPa are -801,67 MPa, -851,37 MPa and -914,51 MPa average, respectively. The samples are submitted to cyclic fatigue testing to verify the influence of compressive residual stresses developed from the three deflections. The fatigue tests maximum results are 32877 (750 MPa), 67347 (1100 MPa) and 104952 (1500 MPa) cycles, fracturing at contact points of the plate

Notes:

Vendor supplied data

Publisher Number:

2025-36-0327

Access Restriction:

Restricted for use by site license