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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。
The design principle, smelting, forging, heat treatment process and its basic properties of a special type of high speed steel-carbonless Fe-W (Mo) -Co (Ni) alloy are introduced and compared with those of common high speed steel. The test results indicate that the alloy with high cobalt content has very strong hardening ability, and the hardness after aging is between 68 and 69, which is the same as that of the super-hard high-speed steel. At 700C, 4h after heating, the hardness remains HRC60 ~ 61, higher than the average 18-4-1 high-speed steel after heating about 17HRC high hardness than high-speed super-hard steel M42 12 ~ 14HRC, 500,600 C high temperature hardness test results That M12 high-speed high-speed steel are about 100HV high. At HRC69, the unnotched impact value reaches 16J / cm ~ 2 and the static bending strength is about 2300N / mm ~ 2. After supplemented with Ni alloying, greatly improving the toughness, the hardness of HRC66 ~ 67, no notch impact value of about 30J / cm ~ 2, static bending strength of 3500N / mm ~ 2 or so, but the hardness, especially red hard Is the high temperature hardness has declined. Also introduced the aging high-speed steel cutting tool test results.