| dc.description.abstract | Medium carbon steel is widely used in engineering application, for example as a
shaft, engine, and building conshuction. The design of shafts using medium carbon
steel, for example, needs fatigue strenglh dat4 before or after heat trcahent process
but the data is not always provided by the manufacturers. They can be obtained by
conducting fatigue experiments. Hence, it is necessary to do research on fatigue
strength limit after heat treatment material in this study, the heat treatnents of
materials were conducted in the accordance with ASTM E466 standard. The
specimens were divided into seven groups for the austenite formation temperature of
725oC,7500C,7750C, 8000c, 8250C, 8500C, and 875 0C, *ith the holding time one
hour for each tempe'rafure. After the heat treatment process, all specimens were
tempered at 1500C for one hour. Specimens were cleaned, and subjected to fatigues
experiment at room temperature. Results of the test show that the highest of fatigue
shength limit is 457 MP4 at 7750C austenite temperature formation \ith 23,34yo of
martensite phase. | en_US |
