Very High Cycle Fatigue Properties of CrMoW Rotor Steel at High-temperature

doi:10.11901/1005.3093.2015.322

Chinese Journal of Materials Research

2016, Vol. 30

Issue (7): 481-488 DOI: 10.11901/1005.3093.2015.322

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Very High Cycle Fatigue Properties of CrMoW Rotor Steel at High-temperature

HOU Fang¹, LI Jiukai¹, XIE Shaoxiong², LIU Yongjie¹, WANG Qingyuan^1,^2,^*(

), ZHANG Junhui³

1. College of Architecture and Environment, Sichuan University, Chengdu 610065, China
2. School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China
3. Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai Turbine Plant, Shanghai 200240, China

Cite this article:

HOU Fang, LI Jiukai, XIE Shaoxiong, LIU Yongjie, WANG Qingyuan, ZHANG Junhui. Very High Cycle Fatigue Properties of CrMoW Rotor Steel at High-temperature. Chinese Journal of Materials Research, 2016, 30(7): 481-488.

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Abstract

The fatigue properties of CrMoW rotor steel were investigated by a high temperature ultrasonic fatigue system. Fatigue tests of CrMoW rotor steel up to 1×10¹⁰ cycles had been conducted at room temperature and 600℃ respectively. Results reveal that the type of S-N curves present continuously descending at room temperature and 600℃. Fatigue fracture occured over 109 cycles. Fractograph of specimens show that Crack initiate mainly from the surface for the specimens that fatigue life is less than 1×10⁷ cycles, but crack initiate mostly from inclusions for those that fatigue life is greater than 1×10⁷ cycles at room temperature. It is found that crack can also initiate at inclusions, but the modes of crack initiation do not play a decisive role for the fatigue life at high temperature. Threshold values of fatigue crack growth obtained by measuring the size of fisheye are 3.4 MPam^1/2 and 1.0 MPam^1/2 at room temperature and 600℃ respectively.

Key words: metallic materials rotor steel high temperature very high cycle fatigue inclusion initiation threshold value of crack growth

Received: 14 October 2015

Fund: *Supported by National Nature Science Foundation of China Nos.11172188&11327801&11502151.Manuscript received October 14, 2015; in revised form December 25, 2015.

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	Fang HOU
	Jiukai LI
	Shaoxiong XIE
	Yongjie LIU
	Qingyuan WANG
	Junhui ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.322 OR https://www.cjmr.org/EN/Y2016/V30/I7/481

Fig.1 Microstructures of CrMoW rotor steel (a) optical, (b) SEM

Table 1 Chemical composition of the materials(%, mass fraction)

Table 2 Mechanical properties of the materials

Fig.2 Specimen of ultrasonic testing (a) room temperature; (b) high temperature (unit: mm); (c) surface topography

Fig.3 High-temperature ultrasonic fatigue testing system

Fig.4 Temperature fluctuation curve

Fig.5 S-N curve of room temperature

Fig.6 S-N curve of high temperature

Fig.7 Fatigue strength varies with fatigue life

Fig.8 Ratio of fatigue strength to tensile strength varies with fatigue life

Fig.9 Typical fractographs of room temperature specimens (a) σ=510 MPa, N_f=1.3806×10⁶; (b) σ=510 MPa, N_f=1.3806×10⁶; (c) σ=490 MPa, N_f=1.5442×10⁷; (d) σ=490 MPa, N_f=1.5442×10⁷

Fig.10 Fractographs of short-life specimens (a) σ=470 MPa, N_f=8.5764 ×10⁵; (b) σ=465 MPa, N_f=3.0132 ×10⁵

Fig.11 Typical fractographs of high temperature specimens (a) σ=125 MPa, N_f=6.6955×10⁸; (b) σ=125 MPa, N_f=6.6955×10⁸; (c) σ=185 MPa, N_f=7.2652 ×10⁶; (d) σ=185 MPa, N_f =7.2652 ×10⁶

Fig.12 Relationship between the diameter of inclusion and fatigue life

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