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Vol.41, No.11, 791 ~ 797, 2003
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| Title |
| Effects of Heat Treatment Condition on the Mechanical Properties and Weldability of 10Cr-1Mo-VNbN Cast Steel |
| 손대영 Son Dae Yeong , 방국수 Bang Gug Su , 이경운 Lee Gyeong Un , 지병하 Ji Byeong Ha |
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| 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. |
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| Key Words |
| 10Cr-1Mo-VNbN cast steel, Heat treatment, Hardness, Microstructure, Weld cold cracking, Hot ductility |
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