Effect of stress relieving treatment on low cycle fatigue behavior of USSP treated 7075 aluminium alloy

7th International Conference on Nanomaterials by Severe Plastic Deformation

Pandey, Vaibhav^1 ; Chattopadhyay, K.^1 ; Santhi Srinivas, N.C.^1 ; Singh, Vakil^1

Department of Metallurgical Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi

221005, India^1

关键词: 7075 aluminium alloy;    Crack initiation and propagation;    Effect of stress;    Low cycle fatigue behavior;    Low cycle fatigues;    Residual compressive stress;    Surface region;    UltraSonic shot peening (USSP);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/194/1/012037/pdf
DOI  :  10.1088/1757-899X/194/1/012037

来源: IOP

【 摘 要 】

The effect of ultrasonic shot peening (USSP) on low cycle fatigue (LCF) behavior of the 7075 aluminium alloy was studied at room temperature. There was grain refinement approximately to 20 nm size, appreciable increase in micro hardness, and inducement of residual compressive stress in the surface region, due to the USSP treatment. The modified microstructure in surface region of the specimens subjected to USSP was characterized by X-ray diffraction and transmission electron microscopy. There was marked increase in LCF life of the specimens due to USSP, however, LCF life of the USSP specimens was reduced due to subsequent treatment of stress relieving. The results are discussed in terms of the process of crack initiation and propagation in the different conditions.