열간단조 금형 육성용접부 내균열성 및 내열충격성의 평가방법에 관한 연구

Abstract

Hardfacing is one of the frequently applying method to increase surface hardness in hot forging die. Recently, hardfacing receives great attention due to it's repair availability and low cost. In hot forging die, crack resistance and thermal shock resistance have been considered as major properties, However there are few studies for the assessment of these properties. So, it is necessary to establish the assessment method for crack resistance and thermal shock resistance in hardfacing for hot forging die. In this study, lux cored arc welding was applied to make hardfacing welds. Three point bending test was carried out to assess hardfacing weld's crack resistance, and high temperature bending test using salt bath was used for thermal shock resistance. Consequently, we could assess crack resistance and thermal shock resistance of hardfacing welds for hot forging die quantitatively.