Evaluation of Fatigue Properties of CA6NM Martensite Stainless Steel Using Miniature Specimens

doi:10.11900/0412.1961.2018.00023

Acta Metall Sin

2018, Vol. 54

Issue (10): 1359-1367 DOI: 10.11900/0412.1961.2018.00023

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Evaluation of Fatigue Properties of CA6NM Martensite Stainless Steel Using Miniature Specimens

Yefei MA^1,², Zhuman SONG², Siqian ZHANG¹, Lijia CHEN¹, Guangping ZHANG²(

)

1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Yefei MA, Zhuman SONG, Siqian ZHANG, Lijia CHEN, Guangping ZHANG. Evaluation of Fatigue Properties of CA6NM Martensite Stainless Steel Using Miniature Specimens. Acta Metall Sin, 2018, 54(10): 1359-1367.

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Abstract

Since structural components in the nuclear power plant are unable to be disassembled during their in service process, it is an urgent and key problem how to quickly and non-destructively evaluate fatigue reliability of these key structural components by using miniature specimens. Fatigue properties of miniature specimens of CA6NM martensite stainless steel for impellers in the nuclear pump were obtained by using symmetrically bending fatigue loading and uniaxial tension-tension fatigue loading, respectively. A comparison of fatigue properties between the miniature specimens and bulk specimens was conducted to examine feasibility for the evaluation of fatigue reliability of the CA6NM steel using miniature specimens. The results show that tensile strength of the 40 μm-thick CA6NM specimens is slightly higher than that of the bulk specimens, but elongation of the 40 μm-thick specimens is lower than that of the bulk counterparts. In low cycle fatigue regime, fatigue strength of the 40 μm-thick specimens subjected to uniaxial tension-tension fatigue loading is lower than that of the standard bulk counterparts. With decreasing the applied stress amplitude, the difference in fatigue properties gradually decreases, and the fatigue limit of the miniature specimen is close to that of the bulk counterparts. Fatigue strength of the 40 μm-thick specimens subjected to bending fatigue loading is much higher than that subjected to uniaxial tension-tension fatigue loading, and also higher than that of the bulk counterparts. Fatigue strength of the miniature specimens is related to the loading mode. The difference in the fatigue mechanism between the miniature specimens and the bulk counterparts is discussed, and the feasibility to evaluate fatigue reliability of the steel using miniature specimens is addressed.

Key words: martensite stainless steel fatigue property miniature specimen size effect nuclear power material

Received: 15 January 2018

ZTFLH:

TG142.71

Fund: Supported by National Natural Science Foundation of China (Nos.51771207 and 51501117)

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	Yefei MA
	Zhuman SONG
	Siqian ZHANG
	Lijia CHEN
	Guangping ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00023 OR https://www.ams.org.cn/EN/Y2018/V54/I10/1359

Fig.1 Schematics of three types of CA6NM martensite stainless steel specimens
(a) bulk specimen for tensile and tension-compression fatigue testing
(b) ultrathin specimen for tensile and tension-tension fatigue testing
(c) ultrathin specimen for symmetrically bending fatigue testing

Fig.2 Variation of relative resistance of cantilever beam specimen with fatigue cycles (a) and optical image on deformation morphology of the cantilever specimen under a given deflection (b) (Inset in Fig.2a is schematic of cantilever beam specimen)

Fig.3 OM (a) and TEM (b) images of CA6NM martensite stainless steels and statistical analyses of martensite lath length (c) and width (d)

Fig.4 Tensile stress-strain curves of bulk and 40 μm-thick specimens of CA6NM martensite stainless steel

Fig.5 Strain amplitude-fatigue life of 40 μm-thick cantilever specimens (a) and comparison of stress amplitude-fatigue life curves at R=0.1 of 40 μm-thick cantilever bending (CB) specimens and tension-tension (TT) specimens, tension-compression (TC) bulk specimens and bulk specimens reported in Refs. [13,25] (b) (t—thickness)

Fig.6 SEM images of fracture (a), surface damage (b) and the surface damage zone etched by FeCl₃ solution (c) of ultrathin specimens subjected to bending fatigue loading at stress amplitude of 402 MPa

Fig.7 SEM images of fatigue fracture (a) and surface damage (b) of the ultrathin specimens subjected to tension-tension fatigue loading at stress amplitude of 230 MPa

Fig.8 SEM images of fatigue fracture (a), surface damage (b) and crack growth path (c) of bulk specimens subjected to TC fatigue loading at stress amplitude of 261 MPa

Fig.9 Schematics of fatigue damage behavior related to the specimen thickness of CA6NM martensitic stainless steel
(a) bulk specimen (b) miniature specimen

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