Influence of Shot Peening Pressure on Stress Corrosion Susceptibility of 304 Austenitic Stainless Steel

2012 ◽  
Vol 486 ◽  
pp. 524-528 ◽  
Author(s):  
Zhi Ming Lu ◽  
Hong Gang Gao ◽  
Cheng Hui Zhu
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Stress Corrosion ◽  
Grain Refinement ◽  
Shot Peening ◽  
Surface Hardness ◽  
Tensile Tests ◽  
Stainless Steel Sheet ◽  
304 Austenitic Stainless Steel ◽  
Corrosion Susceptibility

The surface of 304 austenitic stainless steel sheet specimen was processed by three different shot peening pressure. The thickness of grain refinement layer and refined degree were characterized by SEM, and surface hardness was tested by microhardness tester. The stress corrosion susceptibility of the specimens treated by 0.25,0.30 and 0.40 MPa shot peening pressure was compared through the slow strain rate tensile tests in 5% sodium chloride solution. The results showed that he grain refinement was caused by shot peening treatment in the surface layer and hardness increased; with the rise of shot peening pressure, the thickness of grain refinement layer increased, the surface hardness heightened and the stress corrosion susceptibility index decreased.

Effect of Pre-Shot Peening on Plasma Nitriding Kinetics of Austenitic Stainless Steel

2013 ◽  
Vol 634-638 ◽  
pp. 2955-2959 ◽  
Author(s):  
Lie Shen ◽  
Liang Wang ◽  
Jiu Jun Xu ◽  
Ying Chun Shan
Keyword(s):  
Stainless Steel ◽  
Surface Layer ◽  
Austenitic Stainless Steel ◽  
Shot Peening ◽  
Plasma Nitriding ◽  
Nitrogen Diffusion ◽  
X Ray Diffraction ◽  
304 Austenitic Stainless Steel ◽  
Strain Induced Martensite ◽  
Kinetics Of

The fine grains and strain-induced martensite were fabricated in the surface layer of AISI 304 austenitic stainless steel by shot peening treatment. The shot peening effects on the microstructure evolution and nitrogen diffusion kinetics in the plasma nitriding process were investigated by optical microscopy and X-ray diffraction. The results indicated that when nitriding treatments carried out at 450°C for times ranging from 0 to 36h, the strain-induced martensite transformed to supersaturated nitrogen solid solution (expanded austenite), and slip bands and grain boundaries induced by shot peening in the surface layer lowered the activation energy for nitrogen diffusion and evidently enhanced the nitriding efficiency of austenitic stainless steel.

Stress Corrosion Cracking of Sensitized 304 Austenitic Stainless Steel in Petroleum Refinery Environment

CORROSION ◽  
1982 ◽  
Vol 38 (6) ◽  
pp. 347-353 ◽  
Author(s):  
S. Ahmad ◽  
M. L. Mehta ◽  
S. K. Saraf ◽  
I. P. Saraswat
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Chemical Analysis ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Corrosion Failure ◽  
Ambient Temperatures ◽  
304 Austenitic Stainless Steel ◽  
Petroleum Refineries

Abstract Stress corrosion cracking (SCC) investigations of sensitized 304 austenitic stainless steel were conducted using U-bend specimens of 6.45 and 12.85 mm radii of curvature in Samans solution, which represents the polythionic acid solution formed in the petroleum refineries during shutdown as a result of the interaction of the sulfide scale on the steel surface with moisture and oxygen at ambient temperatures. The chemical analysis of the Samans solution revealed that it contained seven different constituents varying in concentration. They are sulfuric, sulfurous, and thionic acids (di-, tri-, tetra-, penta-, and hexathionic acid). The role of each individual constituent of Samans solution on SCC has been studied. The results of the chemical analysis of the test solutions after failure revealed that out of all constituents of the Samans solution, only tetrathionic acid induced stress corrosion failure of sensitized 304 austenitic stainless steel. The metallographic studies of the fractured surfaces conducted by SEM revealed intercrystalline mode of fracture in all the cases in which the samples cracked.

Laser Shot Peening of 304 Austenitic Stainless Steel without Protective Coating

2011 ◽  
Vol 699 ◽  
pp. 131-140 ◽  
Author(s):  
S. Sathyajith ◽  
S. Kalainathan ◽  
S. Swaroop
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Protective Coating ◽  
Shot Peening ◽  
Substantial Improvement ◽  
Laser Shot ◽  
Maximum Compressive Stress ◽  
Before And After ◽  
304 Austenitic Stainless Steel

Laser Shot Peening without protective Coating (LPPC) was performed on SS304 austenitic stainless steel using a 300 mJ, 10 ns pulse, 1064 nm wavelength Nd:YAG laser with three different pulse densities. A thin layer of water was used as a confinement layer. The peened specimen was characterised with XRD, AFM and a Profilometer. The stress evaluated at the surface of the laser peened sample shows a maximum compressive stress of 1.6 GPa. The surface roughness and depth profile of microhardness before and after LPPC were investigated.The LPPC region indicate substantial improvement in microhardness and compressive residual stress, with marginal increase of surface roughness.

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