Study on the fatigue properties of plasma nitriding S45C with a pre-ultrasonic nanocrystal surface modification process

2013 ◽  
Vol 216 ◽  
pp. 191-198 ◽  
Author(s):  
Bo Wu ◽  
Pangpang Wang ◽  
Young-Shik Pyoun ◽  
Jianxun Zhang ◽  
Ri-ichi Murakami
Keyword(s):  
Surface Modification ◽  
Plasma Nitriding ◽  
Fatigue Properties ◽  
Modification Process

FATIGUE PROPERTIES OF HYBRID SURFACE MODIFIED SCM435H STEEL

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3646-3651
Author(s):  
SHOICHI KIKUCHI ◽  
KENGO FUKAZAWA ◽  
JUN KOMOTORI ◽  
MASAO SHIMIZU
Keyword(s):  
Residual Stress ◽  
Surface Modification ◽  
Compressive Residual Stress ◽  
Induction Hardening ◽  
Hardened Layer ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Residual Stress Field ◽  
Modification Process ◽  
Surface Modified

In order to clarify the effects of nitriding and hybrid surface modification process combining nitriding and induction hardening on fatigue properties of SCM435H steel, high cycle fatigue tests were carried out with a rotational bending machine at room temperature. Observations of fracture surfaces and measurement of hardness and residual stress distributions were carried out to investigate the fracture mechanism. It was revealed that hybrid surface modification process generated a compressive residual stress field and hardened even at center of the specimen. Fatigue strength of hybrid surface modified specimens was much higher than that of substrate and nitrided specimens. This was because a transition of fracture mode from internal to surface fracture; fatigue fracture of nitrided specimens occurred at inside of the hardened layer, in the case of hybrid surface modified specimens, however, fatigue crack initiated at the surface of the specimen with higher hardness and higher compressive residual stress.

Surface modification of metal alloys by plasma immersion ion implantation and subsequent plasma nitriding

2004 ◽  
Vol 186 (1-2) ◽  
pp. 204-208 ◽  
Author(s):  
K.G Kostov ◽  
M Ueda ◽  
M Lepiensky ◽  
P.C Soares ◽  
G.F Gomes ◽  
...  
Keyword(s):  
Surface Modification ◽  
Ion Implantation ◽  
Plasma Nitriding ◽  
Metal Alloys ◽  
Plasma Immersion Ion Implantation

Effect of Plasma Nitriding on Ultra-High Cycle Fatigue Behaviors of Ti-6Al-4V

2011 ◽  
Vol 295-297 ◽  
pp. 2386-2389 ◽  
Author(s):  
Ren Hui Tian ◽  
Qiao Lin Ouyang ◽  
Qing Yuan Wang
Keyword(s):  
High Cycle Fatigue ◽  
Plasma Nitriding ◽  
Fatigue Behavior ◽  
Fatigue Crack Initiation ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Ultrasonic Fatigue ◽  
Ultra High Cycle Fatigue ◽  
Stress Ratios

In order to investigate the effect of plasma nitriding treatment on fatigue behavior of titanium alloys, very high cycle fatigue tests were carried out for Ti-6Al-4V alloy using an ultrasonic fatigue machine under load control conditions for stress ratios of R=-1 at frequency of ƒ=20KHz. Experiment results showed that plasma nitriding treatment played the principal role in the internal fatigue crack initiation. More importantly, plasma nitriding treatment had a detrimental effect on fatigue properties of the investigated Ti-6Al-4V alloy, and the fatigue strength of material after plasma nitriding treatment appeared to be significantly reduced about 17% over the untreated material.

IMPROVEMENT OF SEALING PERFORMANCE FOR NAS BATTERY BY A SURFACE MODIFICATION PROCESS

2012 ◽  
pp. 152-159
Author(s):  
GAOXIAO ZHANG ◽  
ZHAOYIN WEN ◽  
XIANGWEI WU ◽  
GUOQIANG MA
Keyword(s):  
Surface Modification ◽  
Modification Process ◽  
Sealing Performance

Surface Modification

2015 ◽  
pp. 551-577
Keyword(s):  
Surface Modification ◽  
Vapor Deposition ◽  
Plasma Nitriding ◽  
Chemical Vapor ◽  
Salt Bath ◽  
High Energy ◽  
Energy Laser ◽  
High Energy Laser ◽  
Physical And Chemical ◽  
Plasma Carburizing

This chapter describes surface modification processes that go beyond conventional heat treatments, including plasma nitriding, plasma carburizing, low-pressure carburizing, ion implantation, physical and chemical vapor deposition, salt bath coating, and transformation hardening via high-energy laser and electron beams. The chapter compares methods and includes several example applications.

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