TY - JOUR

T1 - Effect of laser peening process parameters and sequences on residual stress profiles

AU - Kallien, Zina

AU - Keller, Sören

AU - Ventzke, Volker

AU - Kashaev, Nikolai

AU - Klusemann, Benjamin

PY - 2019/6/4

Y1 - 2019/6/4

N2 - Laser Peening (LP) is a surface modification technology that can induce high residual stresses in a metallic material. The relation between LP process parameters, in particular laser sequences, as well as pulse parameters and the resulting residual stress state was investigated in this study. The residual stress measurements, performed with the hole drilling technique, showed a non-equibiaxial stress profile in laser peened AA2024-T3 samples with a clad layer for certain parameter combinations. Shot overlap and applied energy density were found to be crucial parameters for the characteristic of the observed non-equibiaxial residual stress profile. Furthermore, the investigation showed the importance of the advancing direction, as the advancing direction influences the direction of the higher compressive residual stress component. The direction of higher residual stresses was parallel or orthogonal to the rolling direction of the material. The effect was correlated to the microstructural observation obtained via electron backscattered diffraction. Additionally, for peening with two sequences of different advancing directions, the study showed that the order of applied advancing directions was important for the non-equibiaxiality of the resulting residual stress profile.

AB - Laser Peening (LP) is a surface modification technology that can induce high residual stresses in a metallic material. The relation between LP process parameters, in particular laser sequences, as well as pulse parameters and the resulting residual stress state was investigated in this study. The residual stress measurements, performed with the hole drilling technique, showed a non-equibiaxial stress profile in laser peened AA2024-T3 samples with a clad layer for certain parameter combinations. Shot overlap and applied energy density were found to be crucial parameters for the characteristic of the observed non-equibiaxial residual stress profile. Furthermore, the investigation showed the importance of the advancing direction, as the advancing direction influences the direction of the higher compressive residual stress component. The direction of higher residual stresses was parallel or orthogonal to the rolling direction of the material. The effect was correlated to the microstructural observation obtained via electron backscattered diffraction. Additionally, for peening with two sequences of different advancing directions, the study showed that the order of applied advancing directions was important for the non-equibiaxiality of the resulting residual stress profile.

KW - Engineering

KW - Laser shock peening

KW - AA 2024

KW - Cladded aluminium

KW - Energy density

KW - Hole drilling

KW - Laser peening

KW - Laser shock peening

KW - Overlap

KW - Residual stresses

KW - Shot pattern

KW - energy density

KW - shot pattern

KW - laser peening

KW - laser shock peening

KW - residual stresses

KW - overlap

KW - cladded aluminum

KW - hole drilling

UR - http://www.scopus.com/inward/record.url?scp=85069462050&partnerID=8YFLogxK

U2 - 10.3390/met9060655

DO - 10.3390/met9060655

M3 - Journal articles

AN - SCOPUS:85069462050

VL - 9

JO - Metals

JF - Metals

SN - 2075-4701

IS - 6

M1 - 655

ER -