STUDIES ON MECHANICAL PROPERTIES AT ELEVATED TEMPERATURE OF TIMKEN 16-25-6(II)
1956 Volume 42 Issue 2 Pages 116-120
Details
1956 Volume 42 Issue 2 Pages 116-120
The authors studied the effects of solution treatment on Timken alloys before hot-cold. working, working temperature and reduction of working on creep rupture properties at 650°C, 31·5kg/mm2.The results were as follows.
(1) Creep resistance increased by the solution treatment before hot-cold working, but ductility of creep rupture testing prominetly decreased by it as compared with the test pieces which were hot-cold worked at the comparable Working condition and not solution-treated before hot-cold working, although the hardness of the test pieces of the comparab1e working condition were not different.
(2) Creep rupture time decreased, and ductility increased as working temperature increased. Creep rate of the specinens worked at 700 and 800°C were not different regardless of the reduction of working and preheat-treatment. The third stage creep strain of the epecimens which were hot-cold worked at 700°C were smaller than when it was hot-cold worked at 800°C.
(3) Creep rupture life decreased while the reduction of working increasd regardless of the increasing hardness. Ductility decreased, while the reduction of working at any working temperature increased.
