scholarly journals Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 503 ◽  
Author(s):  
Asiful H. Seikh ◽  
Amit Sarkar ◽  
Jitendra Kumar Singh ◽  
Sohail M. A. Khan Mohammed ◽  
Nabeel Alharthi ◽  
...  
Keyword(s):  
Cast Iron ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Gray Cast Iron ◽  
Electrochemical Impedance ◽  
Optical Microscope ◽  
Gray Cast ◽  
X Ray Diffraction ◽  
Different Temperatures ◽  
Austempering Temperature

The aim of this investigation was to assess the corrosion behavior of gray cast iron (GCI) alloyed with copper. Alloyed GCI specimens were austempered isothermally at varying temperatures. After austenitizing at 927 °C, the samples were austempered at different temperatures ranging from 260 to 385 °C with an interval of 25 °C for 60 minutes. As a result, these samples developed an ausferrite matrix with different percentages of austenite. The resulting microstructures were evaluated and characterized by optical microscope (OM), scanning electron microscope (SEM), and X-ray diffraction (XRD). The corrosion characteristics were determined using potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) of these samples. These tests were carried out in a medium of 0.5 M H2SO4 and 3.5% NaCl solution. It was observed from the potentiodynamic polarization results that with increasing austempering temperature, the corrosion rate decreased. All results of the EIS were in accordance with a constant phase element (CPE) model. It was found that with an increase in austempering temperature, the polarization resistance (Rp) increased. The austenite content was also found to influence the corrosion behavior of the austempered gray cast iron (AGCI).

scholarly journals Corrosion Mitigation of Gray Cast Iron and Aluminum in NaOH Using Water Hyacinth (Eichhornia crassipes) Plant Extract

2019 ◽  
pp. 1-15
Author(s):  
D. T. Oloruntoba ◽  
O. S. Adesina ◽  
O. F. Abraham ◽  
K. J. Akinluwade
Keyword(s):  
Cast Iron ◽  
Corrosion Rate ◽  
Water Hyacinth ◽  
Eichhornia Crassipes ◽  
Gray Cast Iron ◽  
Optical Microscope ◽  
Hot Water ◽  
Gray Cast ◽  
Plant Leaves ◽  
Inhibitor Efficiency

This research focused on the corrosion behavior of gray cast iron and aluminum in alkaline medium (0.5 M NaOH) with and without inhibitor (water hyacinth Eichhornia crassipes extract) of varying concentrations of 5%, 10%, 15%, 20% and 25%. The corrosion rates of the metal samples were investigated using the weight loss and electrochemical methods alongside the formulation of a dispersant using readily available chemicals to develop a colloidal solution of the extract produced by hot water digestion of the water hyacinth plant leaves. The metallography tests of control samples as well as the most and least corroded samples were carried out using Optical Microscope (OM). The results revealed that the aluminum resulted in minimum corrosion rate of 0.000483 mg/mm2/yr with inhibitor efficiency of 98.93% obtained for sample A5 (25% extract from water hyacinth) while for the gray cast iron, a minimum corrosion rate of -4.4E-05 mg/mm2/yr with inhibitor efficiency of 566.6% obtained for sample C3 (15% extract from water hyacinth). The electrochemical result of aluminum showed increase in corrosion potential from -1.494 VAg/AgCl to -1.482 V Ag/AgCl and that of gray cast iron from -0.5436 VAg/AgCl to -0.2839 VAg/AgCl upon increase in inhibitor concentration. Therefore, the use of water hyacinth (Eichhornia crassipes)extract reduced the corrosion or dissolution rate of gray cast iron and aluminum in (NaOH) sodium hydroxide medium.

scholarly journals An investigation of abrasive wear and corrosion behavior of surface repair of gray cast iron by SMAW

2017 ◽  
Vol 6 (1) ◽  
pp. 90-95 ◽  
Author(s):  
Alireza Sadeghi ◽  
Ahmad Moloodi ◽  
Masoud Golestanipour ◽  
Meysam Mahdavi Shahri
Keyword(s):  
Cast Iron ◽  
Abrasive Wear ◽  
Corrosion Behavior ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Wear And Corrosion ◽  
Surface Repair

Study on the Influences on Microstructure and Properties of High-Strength Grey Cast Iron in Addition to Alloying Elements Nb

2013 ◽  
Vol 800 ◽  
pp. 221-224
Author(s):  
Jun Tao Zhang ◽  
Feng Zhang Ren
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Mechanical Performance ◽  
High Strength ◽  
Optical Microscope ◽  
Gray Cast ◽  
Dynamic Strain ◽  
Cast Irons ◽  
Grey Cast ◽  
The Relationship

The increase of the strength of gray cast iron is mainly depended on alloying. However, with the improvement of strength, its processing performance will always decrease. So three different gray cast irons are studied in this experiment, including adding 0.1% Nb elements, adding 0.2% Nb elements and adding 0.3% Nb elements, to investigate the Nbs effect to the mechanical performance of gray cast iron, we adopt Dynamic Strain Amplifier to measure cutting force to evaluate processing performance, use Optical Microscope and Electron Microscopy observe each samples organization, explains the relationship between Nbs content and the mechanical and processing performance of gray cast iron from micro-level. Finally, we draw the conclusion: when the Nb comes to 0.3 percent, the appearance of E-type graphite and Nb carbide durum granular will greatly decrease its processing performance.

The Effects of Austempering Temperature and Time on Mechanical Properties of Ductile Cast Iron Grade FCD450

2020 ◽  
Vol 856 ◽  
pp. 92-98
Author(s):  
Janthira Chantarach ◽  
Rungsinee Canyook
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Low Temperature ◽  
Impact Toughness ◽  
Ductile Cast Iron ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Austempering Temperature ◽  
Iron Grade

The purpose of the study was to inspect microstructure, mechanical properties and impact toughness of ductile cast iron grade FCD450 produced by austempering process. The study focused on austempering parameter, which effected impact toughness of material at low temperature. The FCD450 was initially temperature austenized at 885°C (1625˚F) for 2 hours. Austempering was carried out at three different temperatures of 271°C (520˚F), 313°C (560˚F) and 357°C (675˚F). The austempering temperature were varied at 1.5, 2.5 and 3.5 hours. X-ray diffraction was showed that the austempered ductile cast iron (ADI) microstructure consists of austenite and ferrite. The results showed that when austempered at 357°C (675˚F) for 2.5 hours has highest hardness and impact energy at low temperature. The dimple ductile fracture of ADI fracture surfaces was revealed by scanning electron microscope (SEM).

Enhancement of the Gray Cast Iron Properties by Adding Chromium Element

2017 ◽  
Vol 753 ◽  
pp. 218-221
Author(s):  
Awad Eisa Gaib Alla Mohamed ◽  
Khairi Abdulsalam
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Chromium Content ◽  
Gray Cast ◽  
Three Samples ◽  
Before And After ◽  
Different Temperatures

In this paper the effect of chromium element on some mechanical properties of gray cast iron is studied .The work was divided in to four categories, each category has three samples; each sample has three different chromium content 0.0%, 1.7%, 3.7%. The mechanical properties were investigated (hardness and impact) before and after the heat treatment. The heat treatment was carried out for period of 12 minutes at two different temperatures. The results confirmed that durability, toughness, and hardness are proportional to the chromium content. The ultimate aim of this research is to enhance the mechanical properties of gray cast iron by adding chromium element.

SALT BATH OXINITRIDING OF GRAY CAST IRON

2008 ◽  
Vol 15 (05) ◽  
pp. 669-674
Author(s):  
M. AHMADI ◽  
M. TEIMOURI ◽  
M. ALIOFKHAZRAEE ◽  
S. M. MOUSAVI KHOEE
Keyword(s):  
Surface Layer ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Salt Bath ◽  
Gray Cast ◽  
Iron Nitride ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
Polarization Technique ◽  
Duplex Surface Treatment

Salt bath oxinitriding is a duplex surface treatment developed to improve tribological and corrosion properties of ferrous materials. In this research, gray cast iron samples were nitrided at the temperature range of 480°C–580°C, and then oxidized in an oxidative salt bath. The phase composition of surface layer was identified by X-ray diffraction. Using a microhardness tester, hardness of nitrided gray cast iron was measured. Corrosion behavior of treated (nitrided and oxinitrided) samples was evaluated using potentiodynamic polarization technique in 3.5% NaCl solution. XRD analyses indicate that the surface layer in nitrided and oxinitrided samples is composed of ε-iron nitride ( Fe 2-3 N ) and magnetite ( Fe 3 O 4), respectively. Results show that the corrosion resistance of gray cast iron can be improved up to 170%.

scholarly journals Improvement of the mechanical properties of nodular gray cast iron with the application of heat treatments

2020 ◽  
Vol 17 (1) ◽  
pp. 21-27
Author(s):  
Ricardo Andrés García-León ◽  
Jhon Herrera-Perea ◽  
Jorge Cerón-Guerrero
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Chemical Characterization ◽  
Thermal Conditions ◽  
Heat Treatments ◽  
Gray Cast ◽  
Energy Dispersion Spectrometry ◽  
Different Temperatures ◽  
Physical And Chemical

For this experimental study, commercial samples of nodular gray cast iron were used. Samples were subjected to different heat treatments such as quenching, tempering, and annealing. These treatments were carried out to obtain an increase in specific mechanical properties such as hardness, where the new values of this property were obtained. In this process, different laboratory tests as metallographic characterization, mechanical characterization by Brinell hardness, physical and chemical characterization by Scanning Electron Microscopy (SEM), and X-ray Energy Dispersion Spectrometry (EDS) were applied. The results obtained show that specific thermal treatments can be implemented together and different temperatures, achieving an increase of three times the value of the hardness for the manufacture of brake discs, able to withstand the thermal conditions caused during his operation.  

Sign in / Sign up

Export Citation Format

Share Document