| Title |
Mechanism of Hot Cracks Formation During Continuous Casting of 36 wt. % Ni-Fe Alloys |
| Authors |
김선구(Sun Koo Kim); 심상대(Sang Dae Shim); 김지준(Ji Joon Kim); 김종완(Jong Wan Kim); 이용득(Yong Deuk Lee); (H . Fredriksson) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
Hot cracking formation and its mechanism in invar alloys during continuous casting were investigated. It was found that the solidification range was not related to the hot cracking susceptibility in invar alloys. The hot cracking range (= liquidus temperature - ductile to brittle transition temperature), was found a reliable index for the prediction of hot cracks. Hot cracking susceptibility in invar alloys is greatly affected by cooling rates. With increase in cooling rates from 10 to 100 ℃/min, the ductile to brittle transition temperature shifted significantly to the higher temperature from 1320 to 1390℃ (ΔT=70℃). A hot cracking mechanism for invar alloys has been proposed. Hot cracks formed in fast-cooled alloys occurred between the primary dendrites due to the equiaxed structure. However, hot cracks formed in slow-cooled alloys occurred between the grain boundaries due to the columnar structure. |