Surface integrity and residual stress analysis of pulsed water jet peened stainless steel surfaces

0504914 - ÚGN 2020 RIV GB eng J - Journal Article
Srivastava, M. - Hloch, Sergej - Gubeljak, N. - Milkovic, M. - Chattopadhyaya, S. - Klich, Jiří
Surface integrity and residual stress analysis of pulsed water jet peened stainless steel surfaces.
Measurement. Roč. 143, September 2019 (2019), s. 81-92. ISSN 0263-2241. E-ISSN 1873-412X
R&D Projects: GA MŠMT(CZ) LO1406
Institutional support: RVO:68145535
Keywords : pulsating water jet * residual stress * micro-hardness * peening * surface roughness
OECD category: Mechanical engineering
Impact factor: 3.364, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0263224119304087?via%3Dihub

Enhancement of the life of the engineering components is essential from the perspective of its performance,
therefore, it is necessary to eliminate the negative effects that attenuates the life of these components.
Numerous surface treatment methods are used at present out of which water jet peening process
have been stated to overcome the shortcoming reported in other surface treatment methods like surface
defects caused by the embedment of particles during shot peening, thermal effects caused by laser shock
peening. It has been reported in studies that the technological modification of water jet technology, ultrasonically
generated pulsed water jet (PWJ) can be used for the peening application but still the detailed
study of parametric variations for the peening process is not clearly explained. The present work aims at
reporting the effect of variation of parameters: jet pressure (40 MPa to 100 MPa), traverse speed of the
nozzle (5 mm/s to 25 mm/s) and standoff distance (15 mmto 31 mm) during the ultrasonically generated
PWJ peening process. The peened surface was quantified in terms of surface residual stress measurements,
micro hardness and surface roughness measurements. The results indicate that the variations
in the parameters shows significant changes in the surface residual stress enhancement and strengthening
process. The lower pressure (40 MPa), lower traverse speed (5 mm/s) and higher standoff distance
(31 mm) showed the maximum improvement in the surface residual stress (up to 540 MPa) and
micro-hardness (up to 570 HV). The impact of the repeated pulses causes plastic deformation on the surface
and sub-surface layers which results into the change in the microstructures of the affected area. The
microstructural examination through field emission scanning electron microscopy showed variations in
these deformations under different parametric conditions. This study can give better understanding for
the proper selection of the peening parameters for practical applications using ultrasonically generated
pulsed water jet technology.
Permanent Link: http://hdl.handle.net/11104/0296451