Study on Fatigue Crack Propagation Rate and Corrosion Mechanism of 60Si2Mn Spring Steel under Salt Spray Environment

HUANG Jun, WU Ceng, MA Wei, YU Jian

doi:10.16577/j.issn.1001-1560.2022.0337

Materials Protection >

2022 , Vol. 55 >Issue 12: 40 - 46

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0337

Study on Fatigue Crack Propagation Rate and Corrosion Mechanism of 60Si₂Mn Spring Steel under Salt Spray Environment

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(Faculty of Civil Engineering， Kunming University of Science and Technology， Kunming 650500， China)

Received date: 2022-06-21

Revised date: 2022-08-24

Accepted date: 2022-09-07

Online published: 2023-12-26

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Abstract

With the aim of studying the fatigue crack propagation rate law and corrosion mechanism of 60Si2Mn， a commonly used material for high-speed track ballastless railway fastener clips in coastal environment，a neutral salt spray chamber was used to simulate the marine environment. The fatigue evaluation of 60Si2Mn spring steel compact tensile (CT) samples under different salt spray corrosion time conditions was carried out and the corrosion mechanism was analyzed through salt spray corrosion and fatigue crack propagation experiments. The surface morphology of the corroded samples was observed with a scanning electron microscope (SEM)，and the corrosion products of the samples were analyzed with an X-ray diffractometer (XRD). Then the fatigue crack propagation rate test was carried out， the crack propagation length was measured based on the flexibility method， and the test data was processed by the seven-point incremental polynomial method. Results showed that with the increase of corrosion time， the corrosion rate of the sample had a downward trend， and the data points of its mass loss versus corrosion time followed the power function law. Compared with the uncorroded sample，the fatigue crack propagation rate of the material did not change significantly. With the increase of the corrosion time， the surface of the sample was covered by a rust layer composed of Fe3O4 and FeOOH， which effectively prevented the mediums such as Cl- from continuing to erode the substrate， making the material possess good corrosion resistance.

Key words： 60Si2Mn; spring steel; salt spray test; corrosion rate; crack propagation rate; corrosion mechanism

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HUANG Jun, WU Ceng, MA Wei, YU Jian . Study on Fatigue Crack Propagation Rate and Corrosion Mechanism of 60Si₂Mn Spring Steel under Salt Spray Environment[J]. Materials Protection, 2022 , 55(12) : 40 -46 . DOI: 10.16577/j.issn.1001-1560.2022.0337

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