scholarly journals Effects of Shot Blasting on Corrosion Properties after Electrodeposition and Fatigue Properties of Arc Welds in Automotive Steel Sheets

2017 ◽  
Vol 58 (12) ◽  
pp. 1715-1720
Author(s):  
Hiroki Fujimoto ◽  
Koji Akioka ◽  
Masatoshi Tokunaga
Keyword(s):  
Fatigue Properties ◽  
Shot Blasting ◽  
Corrosion Properties ◽  
Steel Sheets ◽  
Automotive Steel

Corrosion Behaviour of Automotive Steel Sheets Depending on the Degree of Deformation

2014 ◽  
Vol 635 ◽  
pp. 57-60 ◽  
Author(s):  
Janette Brezinová ◽  
Juraj Koncz ◽  
Miroslav Tomáš ◽  
Ján Slota
Keyword(s):  
Corrosion Rate ◽  
Steel Sheet ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Experimental Studies ◽  
Corrosion Monitoring ◽  
Corrosion Properties ◽  
Degree Of Deformation ◽  
Steel Sheets ◽  
Automotive Steel

This paper presents the results of research aimed to measuring the corrosion properties of automotive steel sheets. The degree of deformation influence to the corrosion properties of the steel sheet for car body parts has been proven by the modern methods of corrosion monitoring such as Electrochemical Impedance Spectroscopy. Corrosion rate was assessed using electrochemical methods in 0.1 M solution of NaCl. Experimental studies have pointed out if degree of deformation increases the corrosion rate of the steel sheet increases as well.

scholarly journals Corrosion Fatigue Characteristics of 316L Stainless Steel Fabricated by Laser Powder Bed Fusion

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1046
Author(s):  
Balachander Gnanasekaran ◽  
Jie Song ◽  
Vijay Vasudevan ◽  
Yao Fu
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Corrosion Fatigue ◽  
Fatigue Properties ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Corrosion Properties ◽  
Powder Bed ◽  
Fatigue Characteristics

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.

Microstructure-Based Assessment of the Corrosion Fatigue Behavior of the Creep-Resistant DieMag422 and AE42 Magnesium Alloys

2016 ◽  
Vol 258 ◽  
pp. 530-533
Author(s):  
Martin Klein ◽  
Patrick Buhr ◽  
Frank Walther
Keyword(s):  
Magnesium Alloys ◽  
Fatigue Behavior ◽  
Fatigue Properties ◽  
Automotive Applications ◽  
Structure Property ◽  
Comprehensive Understanding ◽  
Corrosion Properties ◽  
Application Range ◽  
Sodium Chloride Solutions ◽  
Structure Property Relationship

Magnesium alloys offer high potential for lightweight constructions, e.g. in automotive applications. However, their application range is limited due to their low corrosion resistance. In the present study, the influence of corrosion on the microstructure and the depending mechanical properties under cyclic loading were characterized for the creep-resistant DieMag422 (Mg4Al2Ba-2Ca) and AE42 magnesium alloys. In this context, fatigue properties in distilled water and sodium chloride solutions were assessed in constant amplitude tests. The results were correlated with corrosion properties of the alloys, which were evaluated by immersion tests. Corrosion-and deformation-induced microstructural changes were observed by light and scanning electron microscopy (SEM), yielding a structure-property-relationship for a comprehensive understanding of mechanical and corrosive deterioration mechanisms.

scholarly journals Study of Solidification Cracking Susceptibility during Laser Welding in an Advanced High Strength Automotive Steel

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 673 ◽  
Author(s):  
Gautam Agarwal ◽  
He Gao ◽  
Murugaiyan Amirthalingam ◽  
Marcel Hermans
Keyword(s):  
Laser Welding ◽  
High Strength ◽  
Free Edge ◽  
Processing Parameters ◽  
Solidification Cracking ◽  
Transverse Strain ◽  
Cracking Behavior ◽  
Steel Sheets ◽  
Weld Solidification Cracking ◽  
Automotive Steel

Susceptibility to weld solidification cracking in transformation-induced plasticity steel sheets was studied using a modified standard hot cracking test used in the automotive industry. To vary the amount of self-restraint, bead-on-plate laser welding was carried out on a single-sided clamped specimen at increasing distances from the free edge. Solidification cracking was observed when welding was carried out close to the free edge. With increasing amount of restraint, the crack length showed a decreasing trend, and at a certain distance, no cracking was observed. With the aid of a finite element-based model, dynamic thermal and mechanical conditions that prevail along the transverse direction of the mushy zone are used to explain the cracking susceptibility obtained experimentally. The results indicate that the transverse strain close to the fusion boundary can be used as a criterion to predict the cracking behavior. The outcome of the study shows that optimum processing parameters can be used to weld steels closer to the free edge without solidification cracking.

scholarly journals On the Intergranular Corrosion Properties of Thin Ferritic Stainless Steel Sheets Welded by Fiber-Laser

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1088
Author(s):  
Niklas Sommer ◽  
Igor Kryukov ◽  
Christian Wolf ◽  
Michael Wiegand ◽  
Martin Kahlmeyer ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fiber Laser ◽  
Ferritic Stainless Steel ◽  
Intergranular Corrosion ◽  
Tensile Tests ◽  
Butt Joint ◽  
Thin Sheets ◽  
Corrosion Properties ◽  
Steel Sheets ◽  
Ct Analysis

In the present investigation, thin sheets of stabilized and unstabilized ferritic stainless steel were welded in butt joint configuration using irradiation of a 1070 nm fiber-laser. Using optical microscopy, the microstructural evolution upon alternating heat input was characterized. In addition to that, hardness and tensile tests were carried out on the specimens. Detailed focus was given to the intergranular corrosion properties, which were investigated on basis of the Strauss test with different times of exposure to the corrosive environment. Following these tests, the mechanical properties of the joints were characterized using tensile tests. A combination of the latter with an inspection by μ-CT analysis allows for the proposition of an intergranular corrosion rate with regard to the degradation of the joint strength.

scholarly journals A Study on Cosmetic and Perforation Corrosion Test for Automotive Steel Sheets

1986 ◽  
Vol 72 (8) ◽  
pp. 1111-1118 ◽  
Author(s):  
Shigeo KUROKAWA ◽  
Tenji BAN ◽  
Koji YAMATO ◽  
Toshio ICHIDA
Keyword(s):  
Corrosion Test ◽  
Steel Sheets ◽  
Automotive Steel

Determination of Mechanical and Corrosion Properties of Boride Coating on P91 Steel

2010 ◽  
Vol 438 ◽  
pp. 89-96
Author(s):  
Haidar Omar ◽  
Nikolaos Michailidis ◽  
Stefanos Skolianos ◽  
Azarias Mavropoulos ◽  
Sofia Tsipas ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Performance ◽  
Protective Coatings ◽  
Salt Spray ◽  
Fatigue Properties ◽  
Boride Coating ◽  
Corrosion Properties ◽  
P91 Steel ◽  
The One ◽  
Corrosive Environments

In many applications, even high-performance alloys have to be covered with protective coatings, providing higher corrosion and oxidation resistance, as compared to the alloy itself. This study investigates the feasibility to apply boron coatings on P91 steel by pack cementation process, to increase the steel durability in oxidative and corrosive environments, as well as its mechanical strength. Micro-indentation and the coating impact test were used to characterize the hardness and fatigue properties of the film respectively. The coating corrosion resistance versus the one of the uncoated P91 steel was tested in a salt spray chamber. The coating performance was characterized by optical and scanning electron microscopy to check the consistency of the coated and uncoated surfaces and the oxidation extend. The results show an increased film strength, good fatigue performance and adequate corrosion resistance.

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