APPARATUS FOR DIRECTLY OBSERVING HOT CRACK IN ZONE WHERE SOLID STATE AND LIQUID STATE COEXIST, AND METHOD THEREOF

摘要

PURPOSE: An apparatus for directly observing hot crack in a zone where a solid state and a liquid state coexist, and a method thereof are provided to conveniently observe the generation of the hot crack. CONSTITUTION: A heating coil(104) heats one side of a test piece(103) fixed by a tension tester(100). A cooling gas nozzle(105) sprays cooling gas cooling the other side of the test piece. A camera(106) takes a photograph of a zone where a solid state and a liquid state of the test piece coexist in tensioning the test piece. An image processor(107) processes the photographed image by using an image processing program capable of tracing a position to derivate the transformed quantity and the transforming rate of the test piece.