Iranian Journal of Materials Science and Engineering

en Fatigue Behavior of 4340 Steel at Room and Elevated Temperatures: Correlating Fatigue and Tensile Testing Data گروه مکانیکی و شکل دادن Mechanical Performance and Formability of Materials Research Paper Research Paper In this study, an existing approach for estimating fatigue life using tensile data was extended and applied to 4340 steel under different temperature. The S-N and strain-life curves were plotted at 25, 200, and 350 ˚C. The Basquin and Coffin-Manson equation constants were determined based on the corrected true fracture stress and strain values. Moreover, the b constants were approximated as -0.065, -0.072, and -0.073 at 25, 200, and 350 ˚C, respectively. This was achieved by setting the alternating stress equal to the fatigue limit in an infinite number of cycles when b leveled off. The transition fatigue life of 1000 cycles was considered for 4340 steel to determine the c constants, which were determined to be -0.69, -0.7, and -0.699, at 25, 200, and 350 ˚C, respectively and the strain-life curves were plotted. Comparison of S-N curves obtained from both fatigue and tensile data revealed strong agreement, indicating that the tensile test is a simple and cost-effective method capable of providing a quick estimate of high- and low-cycle fatigue behavior and serving as a suitable alternative to conventional fatigue testing.   S-N curve,Fatigue test,Tensile test,4340 steel 101 111 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-6096-1&slc_lang=en&sid=1 Sahar Ziraki s.ziraki@shirazu.ac.ir 1800319475328460021781 1800319475328460021781 No Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran Amir Moghaddam Kia a.moghaddam@shirazu.ac.ir 1800319475328460021782 1800319475328460021782 No Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran Ramin Ebrahimi ebrahimy@shirazu.ac.ir 1800319475328460021783 1800319475328460021783 Yes Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran