Influence of shot peening on the corrosion fatigue properties of a stainless steel for surgical implants

2004 ◽  
Vol 55 (3) ◽  
pp. 186-193 ◽  
Author(s):  
H. Wieser
Keyword(s):  
Stainless Steel ◽  
Corrosion Fatigue ◽  
Shot Peening ◽  
Fatigue Properties ◽  
Surgical Implants

Notch Effect on the Corrosion Fatigue Behavior of an Austenitic Stainless Steel

2007 ◽  
Vol 345-346 ◽  
pp. 995-998
Author(s):  
Chih Kuang Lin ◽  
Po Fu Kuo
Keyword(s):  
Stainless Steel ◽  
Corrosion Fatigue ◽  
Smooth Surface ◽  
Salt Water ◽  
Fatigue Behavior ◽  
Deionized Water ◽  
Fatigue Properties ◽  
Notch Effect ◽  
The Given ◽  
Circular Notch

The objective of this study is to characterize the influence of notch effect on the high-cycle corrosion fatigue properties of AISI 347 stainless steel in various environments, namely, air, water, NaCl, NaCl plus inhibitor, and H2SO4 solutions. For smooth-surface and semi-circular notch specimens, the rank of fatigue strength in all of the given environments generally took the following order: air ≈ salt water plus inhibitor > deionized water > salt water > sulfuric acid solution. For V-notch specimens, the S-N curves were separated into two groups, i.e. one with air and 3.5% NaCl plus inhibitor and the other with deionized water, 3.5% NaCl and H2SO4. This was attributed to a greater effect of localized acidification occurring at the root of V-notch as compared to the smooth surface and semi-circular notch.

scholarly journals Influences of Horizontal and Vertical Build Orientations and Post-Fabrication Processes on the Fatigue Behavior of Stainless Steel 316L Produced by Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4203 ◽  
Author(s):  
Paul Wood ◽  
Tomasz Libura ◽  
Zbigniew L. Kowalewski ◽  
Gavin Williams ◽  
Ahmad Serjouei
Keyword(s):  
Stainless Steel ◽  
Selective Laser Melting ◽  
Shot Peening ◽  
Fatigue Behavior ◽  
Fracture Pattern ◽  
Fatigue Properties ◽  
Stainless Steel 316L ◽  
Laser Melting ◽  
Test Pieces ◽  
Laser Systems

In this paper, the influences of build orientation and post-fabrication processes, including stress-relief, machining, and shot-peening, on the fatigue behavior of stainless steel (SS) 316L manufactured using selective laser melting (SLM) are studied. It was found that horizontally-built (XY) and machined (M) test pieces, which had not been previously studied in the literature, in both stress-relieved (SR) or non-stress-relieved (NSR) conditions show superior fatigue behavior compared to vertically-built (ZX) and conventionally-manufactured SS 316L. The XY, M, and SR (XY-M-SR) test pieces displayed fatigue behavior similar to the XY-M-NSR test pieces, implying that SR does not have a considerable effect on the fatigue behavior of XY and M test pieces. ZX-M-SR test pieces, due to their considerably lower ductility, exhibited significantly larger scatter and a lower fatigue strength compared to ZX-M-NSR samples. Shot-peening (SP) displayed a positive effect on improving the fatigue behavior of the ZX-NSR test pieces due to a compressive stress of 58 MPa induced on the surface of the test pieces. Fractography of the tensile and fatigue test pieces revealed a deeper understanding of the relationships between the process parameters, microstructure, and mechanical properties for SS 316L produced by laser systems. For example, fish-eye fracture pattern or spherical stair features were not previously observed or explained for cyclically-loaded SLM-printed parts in the literature. This study provides comprehensive insight into the anisotropy of the static and fatigue properties of SLM-printed parts, as well as the pre- and post-fabrication parameters that can be employed to improve the fatigue behavior of steel alloys manufactured using laser systems.

Improving Corrosion Fatigue and Damage Performance of 410 Stainless Steel via LPB

2012 ◽  
Author(s):  
Douglas J. Hornbach ◽  
Jeremy E. Scheel
Keyword(s):  
Stainless Steel ◽  
Residual Stresses ◽  
Corrosion Fatigue ◽  
Shot Peening ◽  
High Cycle Fatigue ◽  
Damage Tolerance ◽  
Foreign Object ◽  
Cycle Fatigue ◽  
Foreign Object Damage ◽  
Compressive Residual Stresses

Stress corrosion cracking (SCC) and corrosion fatigue (CF) of 12% Cr stainless steel components can lead to reduced availability of steam turbines (ST). Significant operation and maintenance (O&M) costs are required to protect against CF and SCC in both aging and new higher efficiency ST systems. Shot peening has been used to reduce the overall operating tensile stresses, however corrosion pits, foreign object damage (FOD), and erosion can penetrate below the relatively shallow residual compression providing initiation sites for SCC and CF. A means of reliably introducing a deep layer of compressive residual stresses in critical ST components will greatly reduce O&M costs by improving CF life, increasing damage tolerance, reducing SCC susceptibility, and extending the service life of components. Low plasticity burnishing (LPB) is an advanced surface enhancement process providing a means of introducing compressive residual stresses into metallic components for enhanced fatigue, damage tolerance, and SCC performance. LPB processing can be applied as a repair process during scheduled overhauls or on new production components. High cycle fatigue tests were conducted on Type 410 stainless steel, a common alloy used in critical ST components, to compare the corrosion fatigue benefits of LPB to shot peening. Samples were tested in an active corrosion medium of 3.5% NaCl solution. Mechanical or accelerated corrosion damage was placed in test samples to simulate foreign object damage, pitting damage and water droplet erosion prior to testing. High cycle fatigue and residual stress results are shown. Compression from LPB was much deeper than the damage providing a nominal 100X improvement in fatigue life compared to the shallow compression from SP. Life extension from LPB offers significant O&M cost savings, improved reliability, and reduced outages for ST power generators.

Influence of the Shot Peening Process on the Fatigue Behaviour of Duplex Stainless Steel Reinforcing Bars

2007 ◽  
Vol 539-543 ◽  
pp. 4981-4986 ◽  
Author(s):  
Enrique Real ◽  
Cristina Rodríguez ◽  
A. Fernández Canteli ◽  
F.Javier Belzunce
Keyword(s):  
Plastic Deformation ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Shot Peening ◽  
Fatigue Behaviour ◽  
Fatigue Properties ◽  
Reinforcing Bars ◽  
Cold Rolled ◽  
Hot Rolled

The influence of shot peening on the fatigue properties of duplex stainless steel reinforcing bars manufactured using both hot and cold rolled processes was studied. From determination of the S-N curves, the experimental results show that shot peening improves the fatigue behaviour of the re-bars, but that the improvement is much greater for the hot rolled bars. A more severe peening action capable of promoting greater plastic deformation of the bar surface needs to be used to improve the fatigue resistance of cold rolled corrugated bars.

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