Effects of microstructure on the corrosion behaviour or medium carbon steel

The research work was based on the study of the corrosion behaviour of the welded and un-welded medium carbon steel in sodium chloride solutions. The Sodium chloride solutions used are 1ml, 2ml, 3ml and 4ml for both welded and un-welded medium carbon steel in NaCl. The experiments were conducted in two ways, the weight loss analyses of measurements and using the electrochemical analyzer workstation to determine the potential dynamic of the samples. The samples for the weight loss measurements were prepared from rolled products obtained at the foundry shop. Two medium carbon steel materials were sourced with different chemical compositions as sample A and B. The materials were prepared to accommodate the experiments for the determination of welded and un-welded medium carbon steel. A total of sixty-eight (68) samples were produced, prepared and used for the weight loss measurements /analyses the experiments. Thirty-four of the samples each were prepared for both the welded and un-welded experiments. All the samples were produced and prepared through the use of various machining processes with the use of a lathe machine for planning, milling. Thirty-four (34) of the sample preparation were further welded in readiness of the experiments. Sixty –eight breakers were sourced for and used. Ten (10) other samples were used for the determination with the use of the electrochemical analyzer. The chemical compositions of the medium carbon steel were determined with the use of SPECTRO Analytical Instruments. A metallurgical inverted optical microscope was used to determine the microstructures of the materials. The Scanning Electron Microscopy with EDS was used to determine the morphologies of the materials. The thirty-four of the samples were welded this process was performed to determine the effects of welding on the material surrounding the weldments. These materials were made into sizes with the use of power hacksaw (i.e. 2cm by 2cm). Other materials were prepared to 1cm x 1cm thickness from the same materials. The Tafel plot experiments and that of the open Circuit Potential Time (OCPT) were carried out with the use of Electrochemical Analyzer/ Workstation. The Medium carbon steel materials were exposed for fifty – four (54) days, with an interval of 3days. The corrosion rates analyses were determined and the graphs of the corrosion rates (mm/yr.) and other parameters were used plotted against No of days exposed.

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INFLUENCE THE QUENCHING AND TEMPERING ON THE MICROSTRUCTURE, MECHANICAL PROPERTIES AND SURFACE ROUGHNESS, OF MEDIUM CARBON STEEL

THE IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING ◽

10.32852/iqjfmme.vol18.iss1.78 ◽

2018 ◽

Vol 18 (1) ◽

pp. 125-135

Author(s):

Sattar H A Alfatlawi

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Surface Roughness ◽

Carbon Steel ◽

Cold Water ◽

Medium Carbon Steel ◽

Medium Carbon ◽

Heating And Cooling ◽

Treatment Processes ◽

Quenching And Tempering

One of ways to improve properties of materials without changing the product shape toobtain the desired engineering applications is heating and cooling under effect of controlledsequence of heat treatment. The main aim of this study was to investigate the effect ofheating and cooling on the surface roughness, microstructure and some selected propertiessuch as the hardness and impact strength of Medium Carbon Steel which treated at differenttypes of heat treatment processes. Heat treatment achieved in this work was respectively,heating, quenching and tempering. The specimens were heated to 850°C and left for 45minutes inside the furnace as a holding time at that temperature, then quenching process wasperformed in four types of quenching media (still air, cold water (2°C), oil and polymersolution), respectively. Thereafter, the samples were tempered at 200°C, 400°C, and 600°Cwith one hour as a soaking time for each temperature, then were all cooled by still air. Whenthe heat treatment process was completed, the surface roughness, hardness, impact strengthand microstructure tests were performed. The results showed a change and clearimprovement of surface roughness, mechanical properties and microstructure afterquenching was achieved, as well as the change that took place due to the increasingtoughness and ductility by reducing of brittleness of samples.

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AISI 1025

Alloy Digest ◽

10.31399/asm.ad.cs0047 ◽

1972 ◽

Vol 21 (3) ◽

Keyword(s):

Fracture Toughness ◽

Corrosion Resistance ◽

Carbon Steel ◽

Physical Properties ◽

Heat Treating ◽

General Purpose ◽

Medium Carbon Steel ◽

Medium Carbon ◽

Steel Mills ◽

Cold Worked

Abstract AISI 1025 is a low-to-medium-carbon steel used in the hot-worked, cold-worked, normalized or water-quenched-and-tempered condition for general-purpose construction and engineering. It is also used for case-hardened components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-47. Producer or source: Carbon and alloy steel mills.

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AISI 1551

Alloy Digest ◽

10.31399/asm.ad.cs0080 ◽

1980 ◽

Vol 29 (2) ◽

Keyword(s):

Carbon Steel ◽

Heat Treating ◽

Medium Carbon Steel ◽

High Manganese ◽

Hand Tools ◽

Medium Carbon ◽

Steel Mills ◽

Cold Worked ◽

Hot Rolled ◽

Good Workability

Abstract AISI 1551 is a medium-carbon steel containing relatively high manganese (0.85-1.15%) for a carbon steel. It can be used in the hot-rolled, annealed, normalized, cold-worked or liquid-quenched-and-tempered condition for numerous applications. It has a combination of good machinability and good workability. Its many uses include hand tools, machinery parts, springs and agricultural machinery. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-80. Producer or source: Carbon steel mills.

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SAE 1037

Alloy Digest ◽

10.31399/asm.ad.cs0076 ◽

1979 ◽

Vol 28 (4) ◽

Keyword(s):

Fracture Toughness ◽

Carbon Steel ◽

Low Cost ◽

Heat Treating ◽

General Purpose ◽

Medium Carbon Steel ◽

Medium Carbon ◽

Steel Mills ◽

Medium Strength ◽

Hot Rolled

Abstract SAE 1037 is a carbon steel that provides medium strength and medium toughness at low cost. It is used in the hot-rolled, normalized, oil-quenched-and-tempered and water-quenched-and-tempered conditions. This medium-carbon steel is used for construction and for general-purpose engineering. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-76. Producer or source: Carbon steel mills.

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SAE 1026

Alloy Digest ◽

10.31399/asm.ad.cs0060 ◽

1976 ◽

Vol 25 (6) ◽

Keyword(s):

Fracture Toughness ◽

Carbon Steel ◽

Heat Treating ◽

Medium Carbon Steel ◽

High Manganese ◽

Medium Carbon ◽

The Core ◽

Steel Mills ◽

Cold Worked ◽

Good Workability

Abstract SAE 1026 is a low-to-medium-carbon steel used in the annealed, hot-worked, normalized, cold-worked or water-quenched-and-tempered condition for a variety of engineering and construction applications. It combines good workability (hot or cold), good machinability and good weldability. It has relatively high manganese (0.60-0.90%); this provides increased hardenability which is reflected in all uses and gives somewhat increased hardness and strength in the core of carburized parts and in uncarburized applications. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-60. Producer or source: Carbon steel mills.

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AISI 4140

Alloy Digest ◽

10.31399/asm.ad.sa0018 ◽

1988 ◽

Vol 37 (9) ◽

Keyword(s):

Fracture Toughness ◽

Carbon Steel ◽

Physical Properties ◽

Temper Embrittlement ◽

Heat Treating ◽

Medium Carbon Steel ◽

Heavy Duty ◽

Medium Carbon ◽

Steel Mills ◽

Aisi 4140

Abstract AISI 4140 is a through-hardening chromium-molybdenum medium carbon steel. It is not subject to temper embrittlement. It is recommended for heavy duty service. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-18. Producer or source: Alloy steel mills and foundries. Originally published May 1954, revised September 1988.

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