Nitrogen implantation of type 303 stainless steel gears for improved wear and fatigue resistance

1987 ◽  
Vol 90 ◽  
pp. 407-416 ◽  
Author(s):  
F.M. Kustas ◽  
M.S. Misra ◽  
W.T. Tack
Keyword(s):  
Stainless Steel ◽  
Fatigue Resistance ◽  
Nitrogen Implantation

scholarly journals Comparison of the cyclic fatigue resistance of ProGlider, PathGlider and One G path-finding instruments

2019 ◽  
Vol 13 (1) ◽  
pp. 57-60
Author(s):  
Damla Özsu Kırıcı ◽  
Ertuğrul Karataş ◽  
Ahmet Demirhan Uygun ◽  
Ezgi Doğanay Yıldız ◽  
Kezban Meltem Çolak ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fatigue Test ◽  
Fatigue Resistance ◽  
Root Canal ◽  
Cyclic Fatigue ◽  
Nickel Titanium ◽  
Curvature Radius ◽  
System A ◽  
Post Hoc ◽  
G 14

Background. The aim of the present study was to compare the cyclic fatigue resistance of novel nickel titanium rotary pathfinding instruments. Methods. Twenty instruments were selected for each file system. A simulated stainless steel root canal, with a 90° angle of curvature and a curvature radius of 3 mm, was used for cyclic fatigue test of the ProGlider (#16, progressive taper: 0.02‒ 0.085), PathGlider (#15, taper: .03), and One G (#14, taper: .03) instruments. Statistical analyses were performed with oneway ANOVA (P=0.05). Post hoc Tukey tests were used to determine any statistically significant differences between the groups. Results. The ProGlider instruments exhibited significantly more cyclic fatigue resistance than both PathGlider and One G instruments (P<0.001). One G instruments had significantly more resistance to fracture than PathGlider instruments (P<0.05). Conclusion. ProGlider instruments had better cyclic fatigue resistance than PathGlider and One G instruments.

Enhancing fatigue resistance of activated tungsten inert gas welded UNS S32750 super duplex stainless steel by optimizing its technological properties

2020 ◽  
pp. 1-11
Author(s):  
A. Arunmani ◽  
T. Senthilkumar
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Duplex Stainless Steel ◽  
Fatigue Resistance ◽  
Process Parameters ◽  
Gas Flow ◽  
Welding Process ◽  
Travel Speed ◽  
Inert Gas ◽  
Super Duplex Stainless Steel

In engineering industries and heavy manufacturing plants, fatigue life of joints plays a pivotal role in determining the overall life span of the welded joint. In this paper, an advanced fusion joining technique, namely activated tungsten inert gas welding, was used for joining UNS S32750 super duplex stainless steel, with ZnO as activation flux. For the enhancement of fatigue resistance of joints, important welding process parameters were fluctuated according to a developed central composite design model. Empirical relationships were developed between the process parameters and the fatigue strength of the joints, which was correlated with the number of cycles to failure (NCF). Using analysis of variance, the significance of the developed fatigue model was ascertained. Using response surface methodology, optimization of process parameters for enhancement of fatigue resistance was done. It was observed that at the optimized activated tungsten inert gas weld process parameters of travel speed of welding torch at 69.85 mm/min, weld current at 125.20 A, and shielding gas flow rate at 14.77 L/min, a high fatigue life of 7.66396 × 108 NCF was obtained and the model was validated to very high predictability. Microstructural variations in the fatigue-tested specimens were evaluated for identifying the grain modifications.

The Effect of Nitrogen Implantation on Martensite in 304 Stainless Steel

1981 ◽  
Vol 7 ◽  
Author(s):  
R. G. Vardiman ◽  
R. N. Bolster ◽  
I. L. Singer
Keyword(s):  
Stainless Steel ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
304 Stainless Steel ◽  
Nitrogen Implantation ◽  
Nitrogen Ion Implantation ◽  
Surface Polishing ◽  
Transmission Electron ◽  
Fine Surface ◽  
Nitrogen Ion

ABSTRACTMartensite will form in austenitic 304 stainless steel when it is deformed. Transmission electron microscope studies show that nitrogen ion implantation causes a reversion of the martensite to austenite. Specimens containing martensite resulting from fine surface polishing and heavy rolling are examined. The transformation is shown not to occur because of temperature increases during implantation. The effect is related to recent wear results in 304 stainless steel.

Effect of Marine Biofilin on Fatigue Resistance of an Austenitic Stainless Steel

2004 ◽  
Vol 22 (2) ◽  
pp. 101-114 ◽  
Author(s):  
N. Acuna, ◽  
C. Rosado, ◽  
B. Valdez, ◽  
M. Schorr, ◽  
G. Hernandez-Duque,
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Fatigue Resistance

Effect of PVD coatings on the strain and low-cycle fatigue resistance of stainless steel and titanium alloys

2011 ◽  
Vol 43 (6) ◽  
pp. 604-614 ◽  
Author(s):  
A. P. Gopkalo ◽  
N. R. Muzyka ◽  
A. V. Rutkovskii ◽  
V. P. Shvets
Keyword(s):  
Stainless Steel ◽  
Titanium Alloys ◽  
Fatigue Resistance ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Pvd Coatings

scholarly journals Cyclic Fatigue Resistance of Blue Heat-Treated Instruments at Different Temperatures

2021 ◽  
Vol 2021 ◽  
pp. 1-5
Author(s):  
Thalita Miranda Vieira ◽  
Ryhan Menezes Cardoso ◽  
Nayane Chagas Carvalho Alves ◽  
Silvio Emanuel Acioly Conrado de Menezes ◽  
Shirley Machado Batista ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fatigue Resistance ◽  
Cyclic Fatigue ◽  
Significance Level ◽  
Instrument Type ◽  
Heat Treated ◽  
Different Temperatures ◽  
Vortex Blue ◽  
Student’S T ◽  
Student’S T Test

The main aim is to evaluate the cyclic fatigue resistance of blue heat-treated instruments with different kinematics. Twenty-four endodontic instruments of the same brand were used for each of three experimental groups: VB (Vortex Blue 40/0.04), RB (RECIPROC Blue 40/0.06), and XB (X1 Blue 40/0.06). The instruments were randomly distributed and subjected to temperatures of 20°C and 37°C. The fatigue test was performed using a stainless steel device. Data were analysed using the Shapiro–Wilk test, Student’s t-test, the F test, and Tukey’s and Tamhane tests at significance level P = 0.05 . The instruments’ cyclic fatigue resistance at both temperatures differed significantly for each instrument type ( P < 0.001 ). The RB instruments displayed greater cyclic fatigue resistance at the tested temperatures compared with the VB and XB instruments ( P < 0.001 ). Reciprocating kinematics positively influenced cyclic fatigue resistance. Blue heat-treated instruments showed decreased cyclic fatigue resistance as the temperature increased ( P < 0.001 ).

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