核电主管道不锈钢在高温高压水环境下的疲劳裂纹萌生行为

doi:10.11896/j.issn.1005-023X.2018.03.005

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Abstract

The behaviors of fatigue crack initiation of 316LN and Z3CN20.09M austenite stainless steels (ASSs) were studied by corrosion fatigue test system in high temperature water. The results indicated that the fatigue cracks were mainly initiated at the persistent slip bands (PSBs) on the surface of 316LN ASS. Only a few cracks were initiated at the sub-grain boundaries. While the fatigue cracks were sequentially initiated at PSBs, phase boundaries and corrosion pits of the Z3CN20.09M ASS containing a little part of ferrite, and they were also mainly initiated at PSBs. The crack initiation mechanism at PSBs was analyzed based on composition of oxide film and morphology of cross section of the specimens tested in high temperature water. Moreover, the difference of the crack initiation mechanisms for two kinds of stainless steel was analyzed. Finally, the effect of the ferrite phase on corrosion fatigue property was summarized.

Key words： stainless steel corrosion fatigue crack initiation high temperature and high pressure water

Published: 10 February 2018 Online: 2018-02-10

CLC number:

TG142.71

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	Articles by authors
	Huanchun WU
	Fei XUE
	Chengtao LI
	Kewei FANG
	Bin YANG
	Xiping SONG

Cite this article:

Huanchun WU,Fei XUE,Chengtao LI, et al. Fatigue Crack Initiation Behaviors of Nuclear Power Plant Main Pipe Stainless Steel in Water with High Temperature and High Pressure[J]. Materials Reports, 2018, 32(3): 373-377.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.03.005 OR https://www.mater-rep.com/EN/Y2018/V32/I3/373

Chemical compositions (mass fraction/%) of 316LN and Z3CN20.09M ASSs

Test conditions and high temperature water chemistry

Cracks morphologies at PSBs on the surface of the 316LN ASS at different strain amplitudes in 320 ℃ water

The XPS spectra peaks collected from the oxide films of the 316LN ASS tested in 320 ℃ water:(a) Fe 2p3/2,(b) Cr 2p3/2,(c) Ni 2p3/2,(d) Mo 3d3/2

Model of the corrosion fatigue crack initiation process at PSBs

Cross section of the specimens tested at different strain amplitudes of the 316LN ASS tested in 320℃ water

Cracks morphologies at sub-grain boundaries on the surface of the 316LN ASS at different strain amplitudes in 320 ℃ water

Cracks morphologies at phase boundary on the surface of the Z3CN20.09M ASS at different strain amplitudes in 290℃ water

Cracks morphologies at pitting corrosion on the surface of the Z3CN20.09M ASS at different strain amplitudes in 290 ℃ water

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