Research Papers: Materials and Fabrication

Fatigue Limit Prediction of the Matrix of 17-4PH Stainless Steel Based on Small Crack Mechanics

[+] Author and Article Information
Defu Nie

National Technology Research Center
on PVP Safety Engineering,
(Hefei General Machinery Research Institute),
Hefei, Anhui, 230031China
e-mail: dove_ndf@sina.com.cn

Yoshiharu Mutoh

Nagaoka University of Technology,
Nagaoka, Niigata 940-2188, Japan
e-mail: mutoh@mech.nagaokaut.ac.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received July 23, 2012; final manuscript received December 6, 2012; published online March 18, 2013. Assoc. Editor: Xian-Kui Zhu.

J. Pressure Vessel Technol 135(2), 021407 (Mar 18, 2013) (5 pages) Paper No: PVT-12-1102; doi: 10.1115/1.4023428 History: Received July 23, 2012; Revised December 06, 2012

The experimentally obtained fatigue limit of high strength steel is generally a value reduced by inherent flaws, and such a value does not characterize the resistance of the matrix of high strength steel to cyclic loading. To investigate the fatigue limit of the matrix, fatigue tests of 17-4PH stainless steel were performed. 17-4PH stainless steel showed a distinct dual-stage S-N curve: one stage corresponding to high stress where crack initiated at the surface and another stage corresponding to low stress where crack initiated from the subsurface inclusion (Al2O3). Based on small crack mechanics, a model was proposed to predict the fatigue limit of the matrix of 17-4PH stainless steel and its validity has been discussed.

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Fig. 1

Microstructure of 17-4PH stainless steel in H1025 condition

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Fig. 2

Schematic diagram showing dimensions of (a) smooth specimen and (b) CT specimen (all dimensions in mm)

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Fig. 3

Dual-stage S-N curve of 17-4PH stainless steel (smooth specimens)

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Fig. 4

Examples of fracture surface observations (a) σa = 700 MPa and (b) σa = 750 MPa

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Fig. 5

EDS analysis of crack initiation sites (a) with an inclusion and (b) without inclusions

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Fig. 6

Comparison of experimental data and modified Basquin equation

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Fig. 7

Comparison of the observed and predicted lives in 17-4PH stainless steel

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Fig. 8

Fatigue crack growth behavior of 17-4PH stainless steel



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