| Title |
Effects of Heat Treatment Condition on the Mechanical Properties and Weldability of 10Cr-1Mo-VNbN Cast Steel |
| Authors |
손대영(Son Dae Yeong); 방국수(Bang Gug Su); 이경운(Lee Gyeong Un); 지병하(Ji Byeong Ha) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
10Cr-1Mo-VNbN cast steel; Heat treatment; Hardness; Microstructure; Weld cold cracking; Hot ductility |
| Abstract |
Mechanical properties and weldability such as HAZ hardness, cold cracking susceptibility and hot ductility of two differently heat treated 10Cr-1Mo-VNbN cast steels were measured and compared. Because of high hardenability of the cast steel, as-annealed cast steel showed martensitic microstructure and thus had higher hardness than annealed-normalized-tempered cast steel which had tempered martensite. Because the welding electrode used resulted in a high hardness weld metal, both cast steels showed same weld metal cold cracking susceptibility even though the as-annealed cast steel had higher HAZ hardness than the annealed-normalizedtempered cast steel. Both cast steels had excellent hot ductility in high temperature range, indicating no risk of grain boundary liquation cracking in the HAZ. However, the as-annealed cast steel showed an inferior ductility in the intermediate temperature range of 1000~1150℃ because of larger unrecrystallized grain size. |