Hamad K. Al-Khalid and Ayman M. Alaskari and Samy E. Oraby, Hardness Variations as Affected by Bar Diameter of AISI 4140 Steel. journal = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology. March 2011, vol. 51(3). 609 - 615 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/9476.