时效硬化高速钢研究(Ⅰ)——时效高速钢的性能

Study on Age Hardening High Speed Steel (Ⅰ)——Properties of Age Hardening High Speed Steel

介绍了一种特殊类型高速钢——无碳的Fe-W(Mo)-Co(Ni)合金的设计原理、冶炼、锻造、热处理工艺及它的基本性能,并与普通高速钢作了比较。试验结果指出,高钴量时合金有极强的硬化能力,时效后硬度达HRC68～69,与超硬高速钢相同。在700C、4h加热之后,硬度仍保持HRC60～61,比普通18-4-1高速钢同样加热后硬度高17HRC左右,比超硬型高速钢M42高12～14HRC,500、600C高温硬度测定结果表明较M12超硬高速钢均高100HV左右。在HRC69时,无缺口冲击值达16J/cm^2,静弯曲强度为2300N/mm^2左右。在辅以Ni合金化后,大大地提高了韧性,在硬度HRC66～67时,无缺口冲值达30J/cm^2左右,静弯曲强度为3500N/mm^2左右,然而硬度、红硬性特别是高温硬度则有所下降。还介绍了时效高速钢刀具试验结果。

This paper introduces the alloying principle,melting, forging and heat treatment processes of non-carbon Fe-W(Mo)-Co(Ni)series age hardening high speed steels . Main properties are given and compared with those of conventional high speed steels. Results show that alloy with high cobalt content has strong age hardenig ability . After aging,it gives the same hardness,HRC68～69,as superhard high speed steel(M42). HRC 60～61 are retained after heating at 700C for 4h,which are higher by 17 HRC,and 12~14 HRC than 18-4-1 and M42 respectively under the same condition. The high-temperature HV hardness values at 500 and 600C are higher by 100 HV than those of M42. The impact value of the un-notched specimen is 16J/cm^2,and the bending stress is 2300N/mm^2, while hardness is HRC 69. The ductility increases with addition of nickel and lowering of Co. The impact value of un-notched specimen is about 30J/cm^2.the bending stress is around 3500N/mm^2, while hardness is about HRC 66～67. Hardness,red-hardness,especially high-temperature hardness,however,have a decreased. The experimental results of the tool performance are also introduced.