Journal of Guangdong University of Technology ›› 2012, Vol. 29 ›› Issue (2): 68-71.doi: 10.3969/j.issn.1007-7162.2012.02.013

• Comprehensive Studies • Previous Articles     Next Articles

The Effects of Nb Modification on the Structure and Properties of Cast High Speed Steel

  

  1. Department of Mechanics, Zhanjiang Technician Institute，Zhanjiang 524037,China
  • Online:2012-06-25 Published:2012-06-25

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Abstract: Nb was applied to the cast high speed steel (HSS) cutter to refine the ascast structure. The structure and hardness at different solid solution temperatures and tempering temperatures were studied. The results show that with solid solution temperature ranging from 1 200 ℃ to 1 220 ℃, the carbide distributes homogeneously as isolated granular. While the temperature is lower than this range, the feathery carbide in the grain boundaries can not be fully dissolved, but while it is higher than this range, granular NbC starts to dissolve. Tempered at the temperatures ranging from 570 ℃ to 580 ℃, fine acicular martensite and least amount of residual austenite can be obtained. While the temperature is lower than this range, coarse martensite and more amount of residual austenite can be obtained.

Key words: high speed steel；modification, ；Nb；carbide；solid solution treatment

［1］ 李彦军，何镇明，姜启川,等.铸造高速钢刀具的生产工艺及组织、性能的改善［J］.工具技术，1997，31(6):7-10.

           Li Yan-jun, He Zhenming, Jiang Qichuan et al. Cast HSS Cutters: Production Technology and Improve of Structure and Performance［J］.Tool Technology,1997,31(6):710.

［2］ 吉林大学物理系金属物理专业精密铸造厂.熔模精密铸造高速钢刀具的组织和性能［J］.吉林大学学报：理学版，1974（3）：60-67.

            Precision Casting Factory, Department of Physics, Jilin University. Structure and Performance of Cast HSS Cutter by Lost wax Process［J］. Journal of University of Jilin(Physics version)，1974(3):60-67.

［3］ 上海刀具厂.壳型铸造高速钢刀具［J］.铸造，1974（4）：40-41.

            Shanghai Cutter Factory. Cast HSS Cutter by Shell Mold Process［J］.Foundry,1974(4):40-41.

［4］ Barkalow R H, Kraft R W, Goldstein J I. Solidification of M2 High Speed Steel［J］. Metallurgical Transactions, 1972(3):919-926.
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