离心铸造轧辊用高速钢的热处理.pdf

45 4 2009 4 470—475 ACTA METALLURGICA SINICA Apr. 2009 –475 ?( ( ) , 110016) (DSC) , , . . : 630 , , , . ,MC ; , M 2C . , , , . , , , , , TG156 A 0412?1961(2009)04?0470?06 HEAT TREATMENT OF HIGH SPEED STEEL USED FOR CENTRIFUGAL CAST ROLLS LUAN Yikun, BAI Yunlong, SONG Nannan, KANG Xiuhong, LI Dianzhong Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 Correspondent: KANG Xiuhong, associate professor, Tel: (024)23971429, E-mail: ******@imr. Supported by the Action Plan for Revitalizing Northeast of Chinese Academy of Science (No. DBZX–1–010) Manuscript received 2008–06–26, in revised form 2008–11–11 ABSTRACT DSC and dilatometry were carried out to determine the phase transformation tem- perature of a high speed steel used for centrifugal cast rolls. Based on the critical transformation temperature, high speed steel was annealed, quenched and tempered in order. The results show that the as–cast high speed steel softens only when annealed at above 630 as to be easily machined. Before and after heat treatment, there are only little di?erences between ponents, morpholo- gies and contents ofMC eutectic carbide. However, more and more metastableM 2C eutectic carbides pose with the increase of quenching temperature; the tempering temperature a?ects much on the ?nal hardness of the hig