TY - JFULL AU - Jung-Ho Moon and Tae Kwon Ha PY - 2014/4/ TI - Alloying Effect on Hot Workability of M42 High Speed Steel T2 - International Journal of Materials and Metallurgical Engineering SP - 224 EP - 227 VL - 8 SN - 1307-6892 UR - https://publications.waset.org/pdf/9997843 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 87, 2014 N2 - In the present study, the effect of Si, Al, Ti, Zr, and Nb addition on the microstructure and hot workability of cast M42 tool steels, basically consisting of 1.0C, 0.2Mn, 3.8Cr, 1.5W, 8.5Co, 9.2Mo, and 1.0V in weight percent has been investigated. Tool steels containing Si of 0.25 and 0.5wt.%, Al of 0.06 and 0.12wt.%, Ti of 0.3wt.%, Zr of 0.3wt.%, and Nb of 0.3wt.% were cast into ingots of 140mm ´ 140mm ´ 330mm by vacuum induction melting. After solution treatment at 1150oC for 1.5hr followed by furnace cooling, hot rolling at 1180oC was conducted on the ingots. Addition of titanium, zirconium and niobium was found to retard the decomposition of the eutectic carbides and result in the deterioration of hot workability of the tool steels, while addition of aluminum and silicon showed relatively well decomposed carbide structure and resulted in sound hot rolled plates. ER -