Improvement of the fatigue strength of SUS304 austenite stainless steel using ultrasonic nanocrystal surface modification

Cavitation normally causes severe damage in hydraulic machinery such as pumps and turbines by the impact produced by cavitation bubbles collapsing. Although cavitation is known as a factor of erosion, Soyama et al. succeeded in utilizing impacts of cavitation bubble collapsing for surface modification by controlling cavitating jet in the same way as shot peening. The local plastic deformation caused by cavitation impact enhances the fatigue strength of metallic materials, and the surface modification technique utilizing cavitation impact is called “cavitation peening (CP)”. It is well known that the peening improves fatigue strength by introducing compressive residual stress on the surface, but little attention has been paid to the behavior of fatigue crack growth of the material which was modified by CP. In the present study, the fatigue behavior of austenite stainless steel with and without CP was evaluated by a plate bending fatigue test, and the results revealed that the compressive residual stress introduced by CP suppresses fatigue crack growth rate by 70 % compared to that without CP.

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A Theory on the Thermal Fatigue Strength of Austenite Stainless Steel

Transactions of the Japan Society of Mechanical Engineers ◽

10.1299/kikai1938.30.789 ◽

1964 ◽

Vol 30 (215) ◽

pp. 789-799 ◽

Cited By ~ 1

Author(s):

Noritada KATOH

Keyword(s):

Stainless Steel ◽

Fatigue Strength ◽

Thermal Fatigue ◽

Austenite Stainless Steel ◽

Thermal Fatigue Strength

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CSW-16: High Temperature Fatigue Strength of Yttria-Stabilized Zirconia Sprayed Stainless Steel(CSW-III: COATING, SURFACE MODIFICATION AND WEAR)

The Proceedings of the JSME Materials and Processing Conference (M&P) ◽

10.1299/jsmeintmp.2005.46_2 ◽

2005 ◽

Vol 2005 (0) ◽

pp. 46

Author(s):

H. WAKI ◽

I. NISHIKAWA ◽

A. OHMORI

Keyword(s):

Stainless Steel ◽

Surface Modification ◽

High Temperature ◽

Fatigue Strength ◽

Yttria Stabilized Zirconia ◽

Stabilized Zirconia ◽

High Temperature Fatigue ◽

Coating Surface

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Effect of Shot-Peening Process on Fatigue Strength of Austenite Stainless Steel.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.66.1172 ◽

2000 ◽

Vol 66 (646) ◽

pp. 1172-1177 ◽

Cited By ~ 2

Author(s):

Shigenobu TAKAHASHI ◽

Munetoh HASHIMOTO ◽

Hajime HIROSE ◽

Toshihiko SASAKI

Keyword(s):

Stainless Steel ◽

Fatigue Strength ◽

Shot Peening ◽

Austenite Stainless Steel

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On the effect of welding condition on joint performance and fatigue strength characteristics of similar austenite stainless steel friction welding joint—study on fatigue strength of friction welding jointYamamoto, Y., Sakai, N., Ogawa, K. and Kaga, S. Setsudai Gakujutsu (Sci. Rev. Setsunan Univ.) A Feb. 1989 (8), 17–37 (in Japanese)

International Journal of Fatigue ◽

10.1016/0142-1123(89)90222-3 ◽

1989 ◽

Vol 11 (6) ◽

pp. 450-450

Keyword(s):

Stainless Steel ◽

Fatigue Strength ◽

Friction Welding ◽

Strength Characteristics ◽

Welding Condition ◽

Joint Performance ◽

Austenite Stainless Steel ◽

Welding Joint ◽

Joint Study

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FATIGUE PROPERTIES OF SUS304 STAINLESS STEEL AFTER ULTRASONIC NANOCRYSTAL SURFACE MODIFICATION (UNSM)

International Journal of Modern Physics Conference Series ◽

10.1142/s201019451200339x ◽

2012 ◽

Vol 06 ◽

pp. 330-335 ◽

Cited By ~ 3

Author(s):

K.Y. Zhang ◽

Y.S. Pyoun ◽

X.J. Cao ◽

B. Wu ◽

R. Murakami

Keyword(s):

Stainless Steel ◽

Surface Layer ◽

Surface Modification ◽

Fatigue Strength ◽

Residual Stresses ◽

Fatigue Testing ◽

304 Stainless Steel ◽

Test Machine ◽

Nanostructured Surface ◽

Surface Residual Stresses

The changing of materials surface properties method always was taken into improving the fatigue strength. In this paper, an ultrasonic nanocrystal surface modification(UNSM) technique was used on the SUS 304 stainless steel to form a nanostructured surface layer with different static load(70N, 90N, 110N, 130N) and the vibration strike number was about 20,000times/mm2. The untreated and different condition specimens fatigue strength was all tested by a dual-spindle rotating bending fatigue test machine. SPring-8(a large synchrotron radiation facility) was used to test the surface nanocrystallization components. The X-ray diffraction (XRD), the scanning electron microscopy (SEM), optical microscope and a micro-Vickers hardness tester (MVK-E3, Akashi) were separately used to get the surface residual stresses, fracture surface after fatigue testing, metallographic structure and the microhardness of the nanostructured surface layer. The result showed that martensite transformation took place on the surface of specimens, the surface residual stresses had only a small increase and some cracks occurred between the martensite layer and the austenite layer, but the fatigue strength of 90N improved 81%.

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