Influence of Carbon Content on the Mechanical Properties of Ultra-high Strength of Coated Steel Wire

2014 ◽  
Vol 69 (1) ◽  
Author(s):  
Cho Myung Hyun ◽  
Suhaimi Salleh ◽  
Norhayati Ahmad ◽  
Ali Ourdjini ◽  
Esah Hamzah
Keyword(s):  
Tensile Strength ◽  
Carbon Content ◽  
Coating Layer ◽  
Steel Wire ◽  
Cold Work ◽  
Zinc Coating ◽  
High Strength ◽  
Galvanized Steel ◽  
Steel Wires ◽  
Torsion Deformation

Ultra-high strength of steel wire for offshore mooring lines can be achieved by increasing carbon content, addition of alloying elements and increasing cold work. The influence of carbon content and zinc coating on the tensile strength and torsion deformation have been investigated for drawn and hot dip galvanized steel wires at various drawing strain. In this work, experiments were conducted to increase the tensile strength of hyper-eutectoid steel wires by increasing carbon content from 0.87%wt to 0.98%wt. The samples with various diameter was drawn to their final diameter, then hot dip galvanized at 460ᵒC in a zinc bath to improve the anti-corrosion property. Torsion deformation has been investigated by twisting the drawn steel wires to different number of revolutions. Fractured samples after torsion test were analysed by optical and Field Emision Scaning Electron Microscope. The results showed that by increasing carbon content up to 0.98%wt (sample D) at drawing strain of 1.97 greatly increased the tensile strength up to 2338 MPa. However, delamination occurred at the zinc coating layer at strength exceeding 2250 MPa and the maximum limit of tensile strength of 0.92% C (sample D) is 2026 MPa without delamination. The effect of zinc coating layer on torsion degradation also revealed that the zinc alloy layer had a significant effect on delamination in the hot dip coating which associated with the higher carbon and silicon content (sample B) in the steel wires.

Research on Fully-Enclosed Composite Cable Made with CFRP and High-Tensile Steel Wire

2011 ◽  
Vol 250-253 ◽  
pp. 1927-1931
Author(s):  
Yun Gang Chen ◽  
Zheng Xing Guo ◽  
Han Chang
Keyword(s):  
Elastic Modulus ◽  
Carbon Fiber ◽  
Stress Ratio ◽  
Steel Wire ◽  
Engineering Application ◽  
High Strength ◽  
Coordination Mechanism ◽  
Axial Stiffness ◽  
Forming Technology ◽  
Steel Wires

In this paper, the proposed idea of producing fully-enclosed composite cable with CFRP coupling of high-tensile steel wires and the forming technology of the fully-enclosed composite cable body were introduced. The coordination mechanism of the fully-enclosed composite cable, the requirement of equal elastic modulus between high strength steel wire bundle and CFRP were investigated theoretically. We have come to the follwing conclusions: (1) Carbon fiber has the same strain with the high-tensile steel wire under the tension of whole anchorage. (2) The distribution of the force of the composite cable is in accordance with the axial stiffness between the carbon fiber with high-tensile steel wire. (3) To achieve a good synergy between the carbon fiber with high-tensile steel wire, similar or equivalent elastic modulus is required. (4) The stress ratio between carbon fiber and high-tensile steel wire in the fully-enclosed composite cable in engineering application should be controlled around 0.5.

Examination of selected cleaning service equipment in the scope of airfield's movement areas maintenance

2020 ◽  
Vol 128 ◽  
pp. 7-17
Author(s):  
Danuta Kowalska ◽  
Mariusz Wesołowski ◽  
Paweł Pietruszewski
Keyword(s):  
Tensile Strength ◽  
Good Condition ◽  
Polymer Brush ◽  
Zinc Coating ◽  
Armed Forces ◽  
Steel Wires ◽  
Flight Operations ◽  
Good State ◽  
Adequate Quality ◽  
The Impact

Maintaining airport surfaces in good condition and in a good state of cleanliness throughout the year is of extreme importance to ensure the safety of flight operations by aircraft. The use of various equipment is practicable in order to clean regularly all paved surfaces. Components of brushes and plows during operation wear out and must be replaced periodically. New elements should be of adequate quality. Examples of airport cleaners and exchangeable cleaning elements are presented. Some requirements have also been given on the brushes’ bristles. To confirm the need to control the purchased cleaning elements, the condition of worn components was checked. The results of laboratory tests of new and used brushes bristles are presented. The tests included microscopic observations, microstructure assessment, tensile strength testing, and microhardness testing. Defects in fixing the bundles of polymer brush bristles during airport exploitation were found. Research on steel wires showed a partial loss of the zinc coating during the brush operation (potential corrosion), lowering the tensile strength and increase the hardness of the wires, which could lead to wires crack and break. The article confirmed the need to control of brushes and plows parameters to ensure their proper quality. Their selected parameters should be controlled during purchase and operation on airfields belonging to the Polish Armed Forces. The impact of deicing agents on the elements mentioned above should also be considered.

Hydrogen Embrittlement and Corrosion Fatigue Performance of Galvanized Steel Wires for High Strength Bridge Cables

2010 ◽  
Vol 146-147 ◽  
pp. 134-142
Author(s):  
Ying Ma ◽  
Jian Shu Ye ◽  
Wan Guang Ge ◽  
Jing Lin
Keyword(s):  
Hydrogen Embrittlement ◽  
Corrosion Fatigue ◽  
Stress Amplitude ◽  
Critical Concentration ◽  
Steel Corrosion ◽  
High Strength ◽  
Critical Value ◽  
Galvanized Steel ◽  
Steel Wires ◽  
Dry Conditions

The research results of mechanical properties, hydrogen embrittlement and corrosion fatigue of new and corroded galvanized wires which were used in cable-supported bridges were summarized. Actual tensile strength of corroded wires did not decrease with corrosion levels, whereas elongation and torsional strength decreased sharply after the zinc layer was partly depleted and the steel started to corrode. The accumulated amounts of diffusive hydrogen of corroded wires with and without induced tension were almost the same and were well below a critical value of 0.7ppm. Therefore, induced tensions of steel wires did not affect the amount of diffusive hydrogen and below the critical concentration to cause brittleness. Fatigue strength did not change only when the galvanized layer was corroded, but it significantly decreased after the steel corrosion below the galvanized layer progressed. The corrosion fatigue life under wet conditions was shorter than that under dry conditions. The endurance life of pre-split steel wires was decreased in stress amplitude and increased in load frequency under fluctuating loading and corrosive environment, the aggressive media accelerated the growth rate of the fatigue crack.

Working Hardening Mechanism and Aging Treatment Behaviors of D631 Precipitation Hardening Stainless Steel Wire

2014 ◽  
Vol 788 ◽  
pp. 362-366 ◽  
Author(s):  
Lei Chen ◽  
Ren Bo Song ◽  
Fu Qiang Yang ◽  
Yu Pei
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Precipitation Hardening ◽  
Fine Particles ◽  
Steel Wire ◽  
Aging Treatment ◽  
High Strength ◽  
Alloying Element ◽  
Hardening Mechanism ◽  
Reduction Of Area

Precipitation hardening stainless steel has the advantages of both austenitic stainless steel and martensitic stainless steel, including good corrosion resistance, excellent processability and high strength. With the evolution of microstructure and properties of semi-austenitic precipitation hardening stainless steel (D631) during drawing process and aging treatment, the working hardening behaviors, law of phase transition, dissolution and precipitation state of alloying element are investigated to gain the toughness mechanism of D631. The results show that the tensile strength increases with the increase of the reduction of area, on the contrary, the plasticity decreases gradually. The tensile strength is 1529 MPa while the reduction of area is 54%. By means of X-ray diffraction (XRD) and metallograpic observation, the content of martensite increases with the increase of deformation, and makes the higher strength and lower plasticity. The alloying element dissolved in the matrix precipitates in fine particles by aging treatment, resulting in a higher strength of 1948MPa.

The Determination of Friction Coefficient between Parallel Wires in Stay Cables

2013 ◽  
Vol 351-352 ◽  
pp. 250-253 ◽  
Author(s):  
Hong Li
Keyword(s):  
Friction Coefficient ◽  
High Strength Steel ◽  
Steel Wire ◽  
High Strength ◽  
Pressure Increase ◽  
Positive Pressure ◽  
Stay Cables ◽  
Steel Wires ◽  
Bending Stresses

To measure and determine the friction coefficients of steel wires accurately is one of the prerequisite for analysing the local bending stresses in staycables. Three test schemes to simulate the real working state of the steel wire, the test value and its variation trend shows that the friction coefficient of high-strength steel wires decreases with the pressure increase, and then becomes stable when the positive pressure is too large.

Effect of Carbon Content and Post-Sintering Cooling Rate on Mechanical Properties of Fe-Ni-Cu-Mo-C High Density Sintered Steel

2007 ◽  
Vol 23 ◽  
pp. 79-82 ◽  
Author(s):  
R. Ivănuş ◽  
Liviu Brânduşan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Carbon Content ◽  
Cooling Rate ◽  
Sintering Temperature ◽  
High Strength ◽  
Green Density ◽  
Test Results ◽  
Sintered Steel ◽  
Application Requirements

Powders-based on the Fe-Cu-Ni-Mo system are well known in the P/M industry for combining good compressibility and dimensional stability with a potential for high strength. The typical heterogeneous microstructure of these materials has proven to provide favourable mechanical properties. However, in applications where strength and hardness become critical variables, faster cooling rates after sintering are required to meet application requirements. Test specimens containing various graphite contents to achieve 0.20, 0.35 and 0.55% combined carbon were pressed to 7.0 and 7.2 g/cm3, sintered in a furnace at 1150°C and cooled directly from sintering temperature with either normal or rapid cooling. Test results are discussed in terms of tensile properties, apparent hardness and microstructure. The formation of bainite and martensite by raising carbon content and cooling rate increased tensile strength and apparent hardness, while a higher green density maintained satisfactory ductility. It was possible to achieve ultimate tensile and yield strengths as 920 and 660 MPa respectively with apparent hardness 30 HRC.

High Strength Galvanized Steel Wire for Bridge Cables

2002 ◽  
Vol 12 (3) ◽  
pp. 209-213 ◽  
Author(s):  
Toshimi Tarui ◽  
Naoki Maruyama ◽  
Tatsuya Eguchi ◽  
Shinichi Konno
Keyword(s):  
Steel Wire ◽  
High Strength ◽  
Galvanized Steel

Effect of modes of patenting carbon wire on its properties

2020 ◽  
pp. 44-48
Author(s):  
I. Yu. Mezin ◽  
◽  
A. S. Limarev ◽  
V. M. Salganik ◽  
I. G. Gun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Content ◽  
Steel Wire ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Strength Properties ◽  
Urgent Task ◽  
Starting Point ◽  
Steel Grades ◽  
The Wire

To increase the competitiveness of carbon steel grades in enterprises, it is necessary to constantly improve the production process. The manufacture of high-strength wire is an urgent area for the enterprises of the hardware industry. One of the most important indicators determining the quality of the wire is the achievement of the specified physical and mechanical properties and microstructure. To this end, the wire is subjected to patenting, which is carried out in special units. To achieve the desired result during patenting, it is necessary to choose and observe the correct regimes depending on the diameter of the wire being processed and the chemical composition of the steel. When developing the modes, it is taken into account that martensite and a significant amount of excess ferrite along the grain boundaries are not allowed in the structure of patented steel. In the course of the work, an analysis was made of the most common carbon wire patenting modes in production, statistical dependences of the designated heating modes of the wire billet and cooling medium on the parameters of the steel wire, namely, its diameter and carbon content in steel, were obtained. An assessment of its strength properties is also carried out. According to the results of the analysis of patenting modes, it was found that certain difficulties arise when mastering the process of patenting steel wires of thick diameters and a carbon content of more than 0.8. Therefore, the solution of issues related to the course of these processes seems to be an urgent task. The results of the studies show the possibility of ensuring the necessary level of mechanical properties of steel in billets of thick diameters during the implementation of the process using lead melt. The data obtained can serve as a starting point for industrial testing and the prospective development of patenting processes.

Zinc coating layer thickness on steel wires

2003 ◽  
Author(s):  
Ajay Siddoju ◽  
Norbert Meyendorf ◽  
Marco Haupert ◽  
Patrick David
Keyword(s):  
Layer Thickness ◽  
Coating Layer ◽  
Zinc Coating ◽  
Steel Wires ◽  
Coating Layer Thickness

scholarly journals Research on Corrosion Fatigue Performance and Multiple Fatigue Sources Fracture Process of Corroded Steel Wires

2019 ◽  
Vol 2019 ◽  
pp. 1-24 ◽  
Author(s):  
Ying Wang ◽  
Yuqian Zheng
Keyword(s):  
Corrosion Fatigue ◽  
High Strength Steel ◽  
Damage Evolution ◽  
Fracture Process ◽  
Steel Wire ◽  
High Strength ◽  
Evolution Process ◽  
Steel Wires ◽  
Corrosion Pit ◽  
Corrosion Pits

Corrosion fatigue (CF) failure is one of the typical failure modes of high-strength steel wires for bridge cables because the cables are subjected to long-term fatigue loads and exposed to heavily polluted environment simultaneously. In this paper, a numerical simulation method was proposed to study CF performance of corroded high-strength steel wires. Firstly, the cellular automata (CA) method was used to generate a numerical model of corroded steel wires with corrosion pit, which can accurately describe the electrochemical process of metal corrosion. In the established CA model, three kinds of cells were involved, namely, metal cell, passive film cell, and corrosive medium cell. By setting 10 cellular transformation rules, morphology of the random corrosion pit on the steel wire surface was simulated. And then, a damage evolution model related to coupling of corrosivemedium and fatigue loads (CCF) was developed to describe the CF damage evolution process of steel wires. Subsequently, the damage evolution process was analyzed by ABAQUS with a user-defined material subroutine (UMAT). Finally, the life of corroded steel wires was predicted, and the CF performance of corroded steel wires with multiple corrosion pits was evaluated. The results show that the proposed method can reasonably describe the CF damage evolution process and illuminate the failure mechanism of steel wires subjected to the CCF. Damage of the steel wire with a single corrosion pit evolves gradually, and the damage evolution rate increases. For the steel wires with multiple corrosion pits, the corrosion pits affect mutually in the fracture process. When the angle and distance between corrosion pits reach a certain degree, the mutual effects can be ignored. With the same pit depth, the angle and distance among corrosion pits determine the CF life of steel wires mainly, and the number of corrosion pits affects slightly.

Sign in / Sign up

Export Citation Format

Share Document