Effect of cold deformation on corrosion fatigue behavior of nickel-free high nitrogen austenitic stainless steel for coronary stent application

2018 ◽  
Vol 34 (4) ◽  
pp. 660-665 ◽  
Author(s):  
Jun Li ◽  
Yixun Yang ◽  
Yibin Ren ◽  
Jiahui Dong ◽  
Ke Yang
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Corrosion Fatigue ◽  
Fatigue Behavior ◽  
Cold Deformation ◽  
Coronary Stent ◽  
High Nitrogen

Effects of Cold Deformation on Precipitation in Fe-18Cr-12Mn-0.48N High-Nitrogen Austenitic Stainless Steel

2012 ◽  
Vol 531-532 ◽  
pp. 97-102 ◽  
Author(s):  
Feng Shi ◽  
Xiao Wu Li ◽  
Yang Qi ◽  
Chun Ming Liu
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Grain Boundaries ◽  
Laser Scanning ◽  
Cold Deformation ◽  
Intermetallic Phase ◽  
Laser Scanning Confocal Microscopy ◽  
High Nitrogen ◽  
Σ Phase ◽  
Scanning Confocal Microscopy

The precipitation behaviors were investigated during isothermally aging at 700°C and 800°C after cold compressed by 30% in thickness in Fe-18Cr-12Mn-0.48N high-nitrogen austenitic stainless steel by using optical microscopy (OM), laser scanning confocal microscopy (LSCM) and transmission electron microscopy (TEM). The results show that precipitation morphology in cold-deformed sample is the same as non-cold-deformed sample, which also displays discontinuous cellular way. Cold deformation accelerates the precipitation of M2N phase. The precipitation occurs at not only grain boundaries but also twin grain boundaries in the experimental steel. In cold-deformed sample, besides the long-strip M2N precipitates, intermetallic phase-σ phase owning bct structure and lattice parameters of a=0.8800nm and c=0.4544nm were observed along grain boundaries and inside the grain.

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