TY - JOUR
T1 - Exploring the influence of ultrasonic peening treatment at ambient and cryogenic conditions on the surface characteristics and fatigue life of austenitic stainless steel 304L
AU - Ghasemi, Ali
AU - Sadough Vanini, Seyed Ali
AU - Alizadeh Zolbin, Maryam
AU - Aghababaei, Ramin
PY - 2024/9/17
Y1 - 2024/9/17
N2 - This study investigates the impact of Ultrasonic Peening Treatment (UPT) at room temperature (Troom) and cryogenic temperature (Tcryo) on phase transformation, surface morphology, and fatigue life of stainless steel 304L samples. Finite element simulations were developed to analyze the effects of different material models and the pin's vertical velocity on residual stress, martensite volume fraction (ξ), and surface deformation. The numerical results of residual stress and ξ were consistent with experimental measurements obtained via X-ray diffraction. Significant compressive residual stress and martensite volume fraction were induced in the subsurface of the specimens following UPT at both temperatures. Various UPT process parameters, including static load, the pin's horizontal velocity, the number of treatments, and lubrication conditions, were experimentally explored for their effects on surface morphology and hardness. Indentation hardness revealed values of 621 HV for samples treated at Tcryo and 489 HV for those treated at Troom, compared to 286 HV for untreated specimens. Furthermore, UPT reduced surface roughness by approximately 88 % for a mechanically polished surface and over 93 % for a rough surface. Investigating conditions leading to potential damage and defects during the process was also undertaken. Fractography of the fracture surfaces and fatigue analysis revealed that the fatigue life of UPT-treated samples at Troom and Tcryo increased by 63 % and 45 %, respectively, compared to untreated specimens.
AB - This study investigates the impact of Ultrasonic Peening Treatment (UPT) at room temperature (Troom) and cryogenic temperature (Tcryo) on phase transformation, surface morphology, and fatigue life of stainless steel 304L samples. Finite element simulations were developed to analyze the effects of different material models and the pin's vertical velocity on residual stress, martensite volume fraction (ξ), and surface deformation. The numerical results of residual stress and ξ were consistent with experimental measurements obtained via X-ray diffraction. Significant compressive residual stress and martensite volume fraction were induced in the subsurface of the specimens following UPT at both temperatures. Various UPT process parameters, including static load, the pin's horizontal velocity, the number of treatments, and lubrication conditions, were experimentally explored for their effects on surface morphology and hardness. Indentation hardness revealed values of 621 HV for samples treated at Tcryo and 489 HV for those treated at Troom, compared to 286 HV for untreated specimens. Furthermore, UPT reduced surface roughness by approximately 88 % for a mechanically polished surface and over 93 % for a rough surface. Investigating conditions leading to potential damage and defects during the process was also undertaken. Fractography of the fracture surfaces and fatigue analysis revealed that the fatigue life of UPT-treated samples at Troom and Tcryo increased by 63 % and 45 %, respectively, compared to untreated specimens.
KW - Fatigue life
KW - Finite element simulation
KW - Martensitic transformation
KW - Residual stress
KW - Surface morphology
KW - Ultrasonic peening treatment
UR - http://www.scopus.com/inward/record.url?scp=85204708800&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2024.131382
DO - 10.1016/j.surfcoat.2024.131382
M3 - Journal article
SN - 0257-8972
VL - 494
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - Part 1
M1 - 131382
ER -