Fine Bainitic Phase in Ductile Iron Produced by Controlled Cooling Heat Treatment
A study was made to develop fine bAlnite phase by controlled cooling heat treatment. Hot shake - out of 1 inch Y-block sand mold was performed prior the isothermal treatment to increase the cooling rate. Very fine bAlnite structure was successfully developed in isothermal temperature 150 ℃ and 200 ℃ with average thickness 56.05 nm and 72.68 nm respectively within only isothermal time 12 hours. Fine bAlnitic phase showed very high hardness to 640 HV on isothermal treatment 150 ℃ and 622 HV on isothermal treatment 200 ℃. This very fine bAlnite phase never been reported in bAlnitic ductile cast iron that produced by austempering process. The achievement of fine bAlnite phase by controlled cooling heat treatment in low temperature was because there is no austenitizing process which will keep low carbon content in austenite phase compared to austenitizing process which will increase carbon content in austenite due to small amount carbon from graphite was dissolved.
bAlnite controlled cooling Isothermal treatment austenitizing
Y. Prasetyo E. R. Baek
Department of Metallurgical Engineering, Yeungnam University, Gyeongsan 712 -749, Korea
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
884-888
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）