Journal of Shanghai University(Natural Science Edition) ›› 2011, Vol. 17 ›› Issue (3): 297-301.doi: 10.3969/j.issn.1007-2861.2011.03.017
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Abstract: The C curve of supercooled austenite of plastic mould steel P20B was investigated with the DIL805A dilatometric instrument. The austenitizing temperature was between 850 ℃ and 1 000 ℃ and the isothermal temperature between 640 ℃ and 720 ℃. We compared austenite grain size at different austenitizing temperatures and analyzed the second phase which obtained from the electrolytic extraction procedure. The results show that at 850~920 ℃ in the temperature range when the austenitizing temperature is increased, the grains grow slightly, the content of B increased significantly to make the C curve strongly shift right. At 920~1 000 ℃ in the temperature range when the austenitizing temperature is increased, the grains grow significantly, and the content of B no longer increases so hardenability of P20B steel does not increased.
Key words: austenitizing temperature, boron alloying, hardenability, mould steel
LI Dan, MIN Yong-An, WUN Xiao-Chun, CHEN Zhuo. Behavior of Austenizing Temperature on Hardenability of P20B Steel[J]. Journal of Shanghai University(Natural Science Edition), 2011, 17(3): 297-301.
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URL: https://www.journal.shu.edu.cn/EN/10.3969/j.issn.1007-2861.2011.03.017
https://www.journal.shu.edu.cn/EN/Y2011/V17/I3/297