بهبودخواص مكانيكي چدن هاي نشكن با بهره گيري از عمليات حرارتي پيوسته و مقادير جزيي عنصر قلع

Improved Mechanical Properties of Ductile Iron with Continues Heat Treatment and Tin Trace Element

In this investigation a study has been done to improved structure and a mechanical property of ferritic-pearlitic ductile iron with continues heat treatment and tin trace element. For these reason standard Y-block that designed with in-mold process. In each experiment was included different chemical analysis. In order to determine the cooling curve used the S-thermocouple (Pt-Rh) in the mold, after casting with control of cooling curve, the Y-block shakeout from molds and then cooled in the air. Then machined standard specimen for mechanical and metallographic exam. The metallographic exam show that with increase the rate of shakeout time, the pearlite in microstrure has been increased, as well as the mechanical exam indicate that with increase the rate of shakeout time, hardness and tensile strength increase , although the percentage of elongation and impact energy has been decreased.