Surface Layer Characteristics of TiB<SUB>2</SUB>/Al Composite by Stress Peening

Abstract

The effect of stress peening on the surface layer characteristics of the TiB 2 /6351Al Composite including residual stress, microhardness and microstructures were investigated. The results show that the compressive residual stresses and microhardness were improved by stress peening. Microstructures investigation showed that, the deformation amount increased by stress peening which results in smaller domain size and higher density dislocations/microstrain. The more reinforcements distributed in the matrix played an important role in the compressive residual stresses increments and microstructures improvements. Stress peening is an effective method to improve the compressive residual stresses and the work-hardened state of the TiB 2 /6351Al Composite.

Residual Stress Relaxation of Shot Peened Deformation Surface Layer on S30432 Austenite Steel under Applied Loading

“…15) And relaxation of the residual stresses was observed under external tensile loadings. Figure 4 shows the relaxation behaviors of the residual stress along longitudinal and transverse directions under static loadings.…”

Effect of prestress state on surface layer characteristic of S30432 austenitic stainless steel in shot peening process

“…After shot peening and prestress is released, the larger elastic deformation is recovered and the higher CRS are induced along LD direction, which is in accord with previous Refs. [16,25].…”

“…[ 16]. In these different prestress conditions, it reaches the maximum values, when the sample pre-stressed with 350 MPa.…”

“…But now, the use of conventional shot peening cannot suffice for the application of industries, a great deal of efforts has been made on the modification of shot peening treatment, such as stress shot peening [16,17]. Compared with the conventional shot peening, in the process of stress shot peening, the components are prestressed with tensile stress along a fixed direction.…”

Effect of Shot Peening on Residual Stress and Microstructure in the Deformed Layer of Inconel 625

“…Usually, as a result, the microstructure is transformed generating smaller domain size and higher micro strain. The depth of the compressive residual stress layer and the ner microstructure can improve the mechanical properties of the material [1][2][3][4][5] . Inconel 625 has been well known and widely used in different industries such as: aerospace, chemistry, nuclear power and others, thanks to its superior thermal, fatigue and creep properties 6) .…”