@article{(Open Science Index):https://publications.waset.org/pdf/9476, title = {Hardness Variations as Affected by Bar Diameter of AISI 4140 Steel}, author = {Hamad K. Al-Khalid and Ayman M. Alaskari and Samy E. Oraby}, country = {}, institution = {}, abstract = {Hardness of the widely used structural steel is of vital importance since it may help in the determination of many mechanical properties of a material under loading situations. In order to obtain reliable information for design, properties homogeneity should be validated. In the current study the hardness variation over the different diameters of the same AISI 4140 bar is investigated. Measurements were taken on the two faces of the stock at equally spaced eight sectors and fifteen layers. Statistical and graphical analysis are performed to asses the distribution of hardness measurements over the specified area. Hardness measurements showed some degree of dispersion with about ± 10% of its nominal value provided by manufacturer. Hardness value is found to have a slight decrease trend as the diameter is reduced. However, an opposite behavior is noticed regarding the sequence of the sector indicating a nonuniform distribution over the same area either on the same face or considering the corresponding sector on the other face (cross section) of the same material bar.}, journal = {International Journal of Mechanical and Mechatronics Engineering}, volume = {5}, number = {3}, year = {2011}, pages = {609 - 615}, ee = {https://publications.waset.org/pdf/9476}, url = {https://publications.waset.org/vol/51}, bibsource = {https://publications.waset.org/}, issn = {eISSN: 1307-6892}, publisher = {World Academy of Science, Engineering and Technology}, index = {Open Science Index 51, 2011}, }