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Evolving Mechanism of Eutectic Carbide in As-cast AISI M2 High-speed Steel at Elevated Temperature 被引量:3

Evolving Mechanism of Eutectic Carbide in As-cast AISI M2 High-speed Steel at Elevated Temperature
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摘要 The evolution in type, size and shape of carbides in as-cast American Iron and Steel Institute (AISI) M2 high-speed steel before and after annealing were investigated. The micromechanism which was responsible for those changes was also analyzed and discussed. At the initial stage of reheating, metastable M2C-type carbide decomposed continuously. M6C-type carbide nucleated at the interface of M2C/γ firstly and grow from surface to center. Then MC-type carbide nucleated at both surface of M6C/M6C and inner of M6C. With the increasing decomposition of the metastable M2C-type carbide, the rod-shaped construction of eutectic carbide began neck- ing, fracturing and spheroidizing gradually. Held enough time or reheated at higher temperature, particle-shaped product aggregated and grew up apparently, while secondary carbide precipitated in cell and grew up less sig- nificantly than the former. Based on the above microstructural observation, the thermodynamic mechanism for decomposition of M2C carbide, for spheroidization of products, and for the growth of particles were analyzed. The rate equations of carbides evolution were derived, too. It shows that the evolving rate is controlled by diffusion coefficients of alloy atoms, morphology of eutectic carbides and heating temperature. <Abstract>The evolution in type,size and shape of carbides in as-cast American Iron and Steel Institute(AISI) M2 high-speed steel before and after annealing were investigated.The micromechanism which was responsible for those changes was also analyzed and discussed.At the initial stage of reheating,metastable M2C-type carbide decomposed continuously.M6C-type carbide nucleated at the interface of M2C/γfirstly and grow from surface to center.Then MC-type carbide nucleated at both surface of M6C/M6C and inner of M6C.With the increasing decomposition of the metastable M2C-type carbide,the rod-shaped construction of eutectic carbide began necking,fracturing and spheroidizing gradually.Held enough time or reheated at higher temperature,particle-shaped product aggregated and grew up apparently,while secondary carbide precipitated in cell and grew up less sig- nificantly than the former.Based on the above microstructural observation,the thermodynamic mechanism for decomposition of M2C carbide,for spheroidization of products,and for the growth of particles were analyzed.The rate equations of carbides evolution were derived,too.It shows that the evolving rate is controlled by diffusion coefficients of alloy atoms,morphology of eutectic carbides and heating temperature.
出处 《Journal of Shanghai Jiaotong university(Science)》 EI 2010年第4期463-471,共9页 上海交通大学学报(英文版)
基金 the National Natural Science Foundation of China(No.50675133) the National Basic Research Program(973) of China(No.2006CB705401)
关键词 high-speed steel as-cast microstructure eutectic carbide spheroidizing annealing high-speed steel, as-cast microstructure, eutectic carbide, spheroidizing annealing
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  • 1李彦军,姜启川,赵宇光,何镇明.M2铸造高速钢的变质研究[J].金属学报,1996,32(3):313-317. 被引量:5
  • 2罗迪,邢国华,李文成,廖欣.M2高速钢中的M_2C碳化物[J].材料科学进展,1990,4(3):232-236. 被引量:5
  • 3上海材料研究所 上海工具厂.工具钢金相图谱[M].北京:机械工业出版社,1979.41,47,119.
  • 4李彦军.M2铸造高速钢中共晶碳化物的团球化研究.哈尔滨工业大学博士学位论文[M].,1997..
  • 5王兆昌.-[J].北京钢铁学院学报,1986,(2):22-22.
  • 6钟雪友 毛卫民.-[J].钢铁,1990,7:52-52.
  • 7王兆昌 马前.-[J].钢铁研究学报,1992,4(3):65-65.
  • 8李绍雄 何镇明 等.-[J].铸造,1989,(7):7-7.
  • 9马前 王兆昌.-[J].钢铁,1990,7(2):79-79.
  • 10叶以富.-[J].山东工业大学学报,1986,(6):1-1.

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