THE EFFECT OF SOME HEAT TREATMENTS ON THE PROPERTIES OF MEDIUM CARBON STEEL

	THE EFFECT OF SOME HEAT TREATMENTS ON THE PROPERTIES OF MEDIUM CARBON STEEL
Tikrit Journal of Engineering Sciences
Article 1, Volume 12, Issue 4, 2005, Pages 45-66 PDF (0 K)
Abstract
The present study is aimed to compare between the effect of the modified isothermal annealing with conventional full annealing and normalizing on the properties of medium carbon steel by full annealing and normalizing tensile test and other disclike shape specimens by heating them at (860Ċ) for (15min); followed by slowly cooling inside furnace for the former treatment and by air cooling for the later to room temperature. The modified isothermal annealing was conducted by heating eight group of specimen ( each groups includes a tensile and a disclike shape specimen ) respectively at (860Ċ) for ( 15min ) , then slowly cooled inside furnace to different temperatures (760,700,600,560,460,380,340,and 260) Ċ then each group is soaked at one of those temperatures for an (1hr), then air cooled to room temperature .Larger (T ) which exceed (800Mpa) and (VHN) values of the treated specimens at (760Ċ) were obtained when compared with those obtained by normalizing. While an increase was took place in ( % )value of the treated specimens at (260Ċ) over its value when full annealed , hence the formability was improved by treating at. (260Ċ) isothermally with a reduction in consumed electric energy because of the shorter thermal cycle. Also the toughness was considered by evaluating the restricted areas under stress – strain curves. Finally the resulted variations in microstructures were observed by optical microscope

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