| 摘要 |
PURPOSE:To evaluate exactly a resistance to thermal fatigue of a material by generating a thermal distortion which is equal to an actual machine, by forming a surface extending from a thick-walled part of the center to a thin part of the outside periphery of an abacus counter-shaped test piece for a fluidized bed thermal fatigue test, to curved surface of a recessed type. CONSTITUTION:A part extending from a center part 10 of a test piece to a tip part 11 is varied like a curve, and a cooling speed of only the tip part 11 has been increased without changing a cooling speed of the thick-walled part 10. Therefore, in the test piece, its isothermal diagram becomes denser, the temperature gradient of the center part and the tip part becomes large, and a thermal distortion which is equal to an actual machine is generated. |
