Transformation of expanded austenite to an amorphous ferromagnetic surface layer during laser carburization of austenitic stainless steel

2009 ◽  
Vol 64 (4) ◽  
pp. 242-248 ◽  
Author(s):  
P. Schaaf ◽  
H. Binczycka ◽  
M. Kahle ◽  
S. Cusenza ◽  
D. Höche ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Surface Layer ◽  
Austenitic Stainless Steel ◽  
Expanded Austenite

scholarly journals Measurement and tailoring of residual stress in expanded austenite on austenitic stainless steel

2017 ◽  
Vol 701 ◽  
pp. 167-173 ◽  
Author(s):  
Frederico A.P. Fernandes ◽  
Thomas L. Christiansen ◽  
Grethe Winther ◽  
Marcel A.J. Somers
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Expanded Austenite

scholarly journals Depth-Resolved Phase Analysis of Expanded Austenite Formed in Austenitic Stainless Steel

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1250
Author(s):  
Darina Manova ◽  
Patrick Schlenz ◽  
Jürgen W. Gerlach ◽  
Stephan Mändl
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Phase Analysis ◽  
Secondary Ion Mass Spectrometry ◽  
Ion Beam ◽  
Strain Analysis ◽  
Optical Emission ◽  
Ion Beam Sputtering ◽  
Anomalous Peak ◽  
Expanded Austenite

Expanded austenite γN formed after nitrogen insertion into austenitic stainless steel and CoCr alloys is known as a hard and very wear resistant phase. Nevertheless, no single composition and lattice expansion can describe this phase with nitrogen in solid solution. Using in situ X-ray diffraction (XRD) during ion beam sputtering of expanded austenite allows a detailed depth-dependent phase analysis, correlated with the nitrogen depth profiles obtained by time-of-flight secondary ion mass spectrometry (ToF-SIMS) or glow discharge optical emission spectroscopy (GDOES). Additionally, in-plane XRD measurements at selected depths were performed for strain analysis. Surprisingly, an anomalous peak splitting for the (200) expanded peak was observed for some samples during nitriding and sputter etching, indicating a layered structure only for {200} oriented grains. The strain analysis as a function of depth and orientation of scattering vector (parallel/perpendicular to the surface) is inconclusive.

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.

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