试验证明P18等十种型号的高速钢,锻造后淬火、回火前等温退火与否,组织和性能基本一致(表1),而且由于这些高速钢在锻造时提高了硬度,故使用锻后不经中间退火直接淬火回火的高速钢,不仅可以简化工艺,而且还能提高刀具的使用寿命。用这种钢制造的简单刀具,在某些情况下共寿命要此淬火前等温退火制造的刀具高得多(表2)。 Test proved P18 and other ten types of high-speed steel, forging after quenching, isothermal annealing before tempering or not, the organization and performance are basically the same (Table 1), but also because these high-speed steel in forging increased hardness, so the use of forging after Directly after the intermediate annealing quenched and tempered high-speed steel, not only can simplify the process, but also improve tool life. Simple tools made from this steel, in some cases, have a much longer life than isothermal anneals before quenching (Table 2).