Effects of the microstructural characteristics of a metastable β Ti alloy on its corrosion fatigue properties

Laser powder bed fusion (LPBF) has been increasingly used in the fabrication of dense metallic structures. However, the corrosion related properties of LPBF alloys, in particular environment-assisted cracking, such as corrosion fatigue properties, are not well understood. In this study, the corrosion and corrosion fatigue characteristics of LPBF 316L stainless steels (SS) in 3.5 wt.% NaCl solution have been investigated using an electrochemical method, high cycle fatigue, and fatigue crack propagation testing. The LPBF 316L SSs demonstrated significantly improved corrosion properties compared to conventionally manufactured 316L, as reflected by the increased pitting and repassivation potentials, as well as retarded crack initiation. However, the printing parameters did not strongly affect the pitting potentials. LPBF samples also demonstrated enhanced capabilities of repassivation during the fatigue crack propagation. The unique microstructural features introduced during the printing process are discussed. The improved corrosion and corrosion fatigue properties are attributed to the presence of columnar/cellular subgrains formed by dislocation networks that serve as high diffusion paths to transport anti-corrosion elements.

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The Effects of Residual Magnetism on the Corrosion Fatigue Properties of Type 410 Stainless Steel Compressor Blades

CORROSION ◽

10.5006/0010-9312-32.3.109 ◽

1976 ◽

Vol 32 (3) ◽

pp. 109-114

Author(s):

J.D. COLLINS

Keyword(s):

Stainless Steel ◽

Corrosion Fatigue ◽

Fatigue Properties ◽

Compressor Blades ◽

Residual Magnetism

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Effect of machine hammer peening on the surface integrity of a ZnAl-based corrosion protective coating

MATEC Web of Conferences ◽

10.1051/matecconf/202031801008 ◽

2020 ◽

Vol 318 ◽

pp. 01008

Author(s):

Alina Timmermann ◽

Mohamed Abdulgader ◽

Leif Hagen ◽

Alexander Koch ◽

Philipp Wittke ◽

...

Keyword(s):

Corrosion Fatigue ◽

Surface Integrity ◽

Protective Coatings ◽

Fatigue Behavior ◽

Turbine Blades ◽

Fatigue Properties ◽

Machine Hammer Peening ◽

Coated Surfaces ◽

Thermally Sprayed ◽

Hammer Peening

Thermally sprayed protective coatings are applied onto many mechanically stressed components such as support structures, shafts, turbine blades or heat exchangers. In addition to the static or cyclic load, a superimposition with corrosion processes occurs in many cases. Thermal sprayed ZnAl coatings are known for their performant corrosion protection properties. Within this context, the potential of ZnAl-based layer systems was analyzed regarding corrosion fatigue behavior. Therefore, a timeand cost-efficient testing strategy based on a corrosion-superimposed load increase procedure was used to estimate the effects of a corrosive attack during cyclic loading. The investigated coating systems were thermally sprayed and partially post-processed with a Machine Hammer Peening (MHP) operation. This treatment was identified as an appropriate technique for compressing and smoothing coated surfaces. The inter-relationships between the parametrization of the MHP process, the resulting surface integrity, and the estimated corrosion fatigue properties were analyzed. The investigations indicate a positive effect of MHP post-processing operations on the surface properties of the ZnAl-based coating system.

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On the Corrosion-Fatigue Properties of a Screw-Shaft Materials of War-Ships in a 3% Na Cl Aq. Solution (2nd Report)

Journal of the Society of Materials Science Japan ◽

10.2472/jsms.12.784 ◽

1963 ◽

Vol 12 (122) ◽

pp. 784-787

Author(s):

S. Hukai ◽

Z. Takao ◽

M. Morizawa

Keyword(s):

Corrosion Fatigue ◽

Fatigue Properties

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Effects of β-cooling rates on microstructural characteristics and hardness of Ti–5Al–5Mo–5V–3Cr–1Fe metastable β Ti alloy

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2021.125318 ◽

2022 ◽

Vol 276 ◽

pp. 125318

Author(s):

Zhiying Zheng ◽

Linjiang Chai ◽

Zhihao Li ◽

Weijiu Huang ◽

Lin Tian ◽

...

Keyword(s):

Ti Alloy ◽

Microstructural Characteristics ◽

Cooling Rates

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Corrosion Fatigue Properties of Ti-6Al-6V-2Sn (STOA)

Flaw Growth and Fracture ◽

10.1520/stp35549s ◽

2009 ◽

pp. 345-345-20

Author(s):

WE Krupp ◽

JT Ryder ◽

DE Pettit ◽

DW Hoeppner

Keyword(s):

Corrosion Fatigue ◽

Fatigue Properties

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Corrosion and Corrosion Fatigue Properties of Additively Manufactured Magnesium Alloy WE43 in Comparison to Titanium Alloy Ti-6Al-4V in Physiological Environment

Materials ◽

10.3390/ma12182892 ◽

2019 ◽

Vol 12 (18) ◽

pp. 2892 ◽

Cited By ~ 4

Author(s):

Nils Wegner ◽

Daniel Kotzem ◽

Yvonne Wessarges ◽

Nicole Emminghaus ◽

Christian Hoff ◽

...

Keyword(s):

Titanium Alloy ◽

Fatigue Strength ◽

Magnesium Alloy ◽

Corrosion Fatigue ◽

Fatigue Properties ◽

Test Duration ◽

Medical Sector ◽

Manufacturing Techniques ◽

Alloy We43 ◽

Application Fields

Laser powder bed fusion (L-PBF) of metals enables the manufacturing of highly complex geometries which opens new application fields in the medical sector, especially with regard to personalized implants. In comparison to conventional manufacturing techniques, L-PBF causes different microstructures, and thus, new challenges arise. The main objective of this work is to investigate the influence of different manufacturing parameters of the L-PBF process on the microstructure, process-induced porosity, as well as corrosion fatigue properties of the magnesium alloy WE43 and as a reference on the titanium alloy Ti-6Al-4V. In particular, the investigated magnesium alloy WE43 showed a strong process parameter dependence in terms of porosity (size and distribution), microstructure, corrosion rates, and corrosion fatigue properties. Cyclic tests with increased test duration caused an especially high decrease in fatigue strength for magnesium alloy WE43. It can be demonstrated that, due to high process-induced surface roughness, which supports locally intensified corrosion, multiple crack initiation sites are present, which is one of the main reasons for the drastic decrease in fatigue strength.

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