Akademik Veri Yönetim Sistemi
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, cilt.12, sa.2, ss.215-219, 2003 (SCI-Expanded)
The fatigue characteristics of the hot work tool steel X40CrMoV 51 (UNS number T20811) at high temperatures is presented. The temperatures for the experiments, were chosen between 50-600 degreesC. The experiments used B-type cylindrical specimens machined froth X40CrMoV in an R.R. Moore rotating bending type fatigue test machine obeying the high cycle principle: The temperature intervals for the experiments were chosen as 50, 100, 200, 300, 400, 500, and 600 degreesC, for which the fatigue limit for each interval at 2 x 106 cycles was determined. The fatigue limit of the material at room temperature (RT) is observed as 432 MPa, whereas it drops to 383 MPa at 400 degreesC. On the. other hand, it stays almost constant between 400-600 degreesC, indicating that the material includes the elements forming strong carbides such as V, Mo, and Cr, which prevent the decrease of the fatigue limit due to higher temperatures.