上海大学学报(自然科学版) ›› 2011, Vol. 17 ›› Issue (3): 297-301.doi: 10.3969/j.issn.1007-2861.2011.03.017

• 材料科学 • 上一篇    下一篇

奥氏体化温度对P20B钢淬透性的影响行为

  

  1. 上海大学 材料科学与工程学院,上海 200072
  • 收稿日期:2009-10-13 出版日期:2011-06-24 发布日期:2011-06-24
  • 通讯作者: 闵永安(1971~),男,副教授,博士,研究方向为模具钢. Email:mya@staff.shu.edu.cn
  • 作者简介:闵永安(1971~),男,副教授,博士,研究方向为模具钢. Email:mya@staff.shu.edu.cn
  • 基金资助:

    国家科技部“十一五”科技资助项目(2007BAE51D04)

Behavior of Austenizing Temperature on Hardenability of P20B Steel

  1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
  • Received:2009-10-13 Online:2011-06-24 Published:2011-06-24

摘要: 采用DIL805A型相变仪,测定含硼P20B钢在850~1 000 ℃的奥氏体化条件下的过冷奥氏体在640~720 ℃等温时的C曲线;结合850~1 000 ℃奥氏体化条件下晶粒度的测定和第二相分析,研究硼对P20B钢淬透性的影响行为.结果表明:在850~920 ℃的温度范围内,随着奥氏体化温度的升高,晶粒略有长大,固溶硼含量显著增加,使高温C曲线明显右移,即淬透性明显提高;而在920~1 000 ℃的温度范围内,随着奥氏体化温度的升高,晶粒显著长大,固溶硼含量不再明显增加,此时淬透性不再明显提高.

关键词:  , 硼微合金化;淬透性; 模具钢;奥氏体化温度

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