Machinability of an Experimental Graphitised Carbon Steel

2016 ◽  
Vol 879 ◽  
pp. 477-482 ◽  
Author(s):  
Aqil Inam ◽  
David Edmonds
Keyword(s):  
Electron Microscopy ◽  
Surface Roughness ◽  
Carbon Steel ◽  
Chip Morphology ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Experimental Medium ◽  
High Temperature Anneal ◽  
Steel Grades ◽  
Alternative Routes

The machinability of an experimental medium-carbon steel with a composition designed to promote rapid graphitisation during a high temperature anneal has been studied. The goal has been to explore alternative routes to a competitive free-cutting composition enabling less expensive steelmaking, manufacturing and recycling. Three starting microstructures prior to annealing have been considered; martensite, bainite and ferrite/pearlite. The microstructures and graphite dispersions formed have been characterised by optical and electron microscopy and the performance of the steel during machining compared with commercial free-cutting steel grades. A bench-top drill rig and metallographic techniques were used to evaluate relative machinability parameters, including surface roughness, tool wear and chip morphology. Thus it proved possible to rank the experimental steel graphitised from the three starting microstructural conditions and also against the commercial free-cutting steels.

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

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.

The Factors Influenced to Surface Finish in Milling for Hardened Medium Carbon Steel: JIS S50C

2011 ◽  
Vol 383-390 ◽  
pp. 7133-7137 ◽  
Author(s):  
Komson Jirapattarasilp ◽  
Sittichai Kaewkuekool ◽  
Worapong Phongphatrawut
Keyword(s):  
Surface Roughness ◽  
Carbon Steel ◽  
Surface Quality ◽  
Surface Finish ◽  
Feed Rate ◽  
Cutting Speed ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
High Cutting Speed ◽  
Full Factorial Experimental Design

The aim of this research was to study factors, which was influenced on surface roughness in vertical milling of hardened medium carbon steel. The specimen was medium carbon steel grade JIS S50C that was hardened at 56± 2 HRC. Full factorial experimental design was conducted by 3 factors and 3 levels (33 design) with 2 replications. Studied factors were consisted of cutting speed, feed rate, and air coolant pressure. The results revealed that influenced factor affected to surface roughness was cutting speed and feed rate which showed significantly different. Higher cutting speed would cause on better surface quality. On the other hand, poorer surface quality was produced by higher feed rate. However, factors interaction were found between cutting speed with air coolant pressure and feed rate with air coolant pressure that significantly influenced to surface roughness. The interaction of high cutting speed with high air coolant pressure would be better quality of surface finish and lower feed rate with high air coolant pressure would be better surface quality.

Optimization of Surface Roughness in End Milling of Medium Carbon Steel under the Influence of Magnets Attached to the Machine Spindle

2012 ◽  
Vol 576 ◽  
pp. 115-118
Author(s):  
A.K.M. Nurul Amin ◽  
Syidatul Akma ◽  
Maizatul Akma ◽  
M.D. Arif
Keyword(s):  
Surface Roughness ◽  
Carbon Steel ◽  
Metal Cutting ◽  
Permanent Magnets ◽  
End Milling ◽  
Cutting Speed ◽  
Medium Carbon Steel ◽  
Depth Of Cut ◽  
Machining Accuracy ◽  
Medium Carbon

One of the major technological parameters in metal cutting is surface roughness. It is an unavoidable, and often, unwanted by-product of all machining operations, especially end milling. Surface roughness is directly related to product quality and performance, operation cost, machining accuracy, and chatter. Today’s stringent customer requirements demand machined parts with minimum (mirror finished) products. Hence, the prediction, modeling, and optimization of surface roughness is a quintessential concern in machining research and industrial endeavor. This research was undertaken in order to determine whether end milling of medium carbon steel performed using chosen ranges of cutting parameter and under magnetic field generated by permanent magnets could effectively improve surface roughness. A small central composite design with five levels and an alpha value of 1.4142, in Response Surface Methodology, was used in developing the relationship between cutting speed, feed, and depth of cut, with surface roughness. Design-Expert 6.0 software was utilized to develop the quadratic empirical mathematical model for surface roughness. The experiments were performed under two different conditions. The first condition was cutting under normal conditions, while the other one was cutting under the application of magnetic fields from two permanent magnets. Medium carbon steel was used as the work material. The resultant average surface roughness was found to be reduced by a maximum of 59% due to magnet application.

scholarly journals Fatigue Life Estimation of Medium-Carbon Steel with Different Surface Roughness

2017 ◽  
Vol 7 (4) ◽  
pp. 338 ◽  
Author(s):  
Changyou Li ◽  
Weibing Dai ◽  
Fei Duan ◽  
Yimin Zhang ◽  
David He
Keyword(s):  
Surface Roughness ◽  
Fatigue Life ◽  
Carbon Steel ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Life Estimation ◽  
Fatigue Life Estimation

Microstructural Evolution during Warm Compression of Medium Carbon Steel Quenched

2008 ◽  
Vol 47-50 ◽  
pp. 853-856 ◽  
Author(s):  
Xin Zhao
Keyword(s):  
Electron Microscopy ◽  
Carbon Steel ◽  
Microstructural Evolution ◽  
Lath Martensite ◽  
Optical Microscope ◽  
Medium Carbon Steel ◽  
High Angle ◽  
Medium Carbon ◽  
Transmission Electron ◽  
Gleeble 3500

In order to produce nano-structured carbon steel, a 0.45%C steel was quenched and warm-compressed on a Gleeble 3500 Machine. The microstructural evolution during the process was studied by using an optical microscope and a transmission electron microscopy. The starting microstructure was lath martensite with a small amount of flake martensite. A lot of high-angle boundaries between martensite laths were induced after 50% reduction compression at 350°C. The microstructure of the specimen compressed at 600-650°C was nano-carbides + equiaxed ultrafine ferrite grains. The mechanism for grain refinement is incomplete dynamic recrystallization.

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