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采用不同的工艺对M2高速钢模具进行热处理,并测试和分析试样的表面硬度、耐磨损性能和抗冷热疲劳性能。结果表明,分级退火和预热后再淬火的热处理工艺有利于细化M2高速钢模具组织中的碳化物、提高表面硬度、耐磨损性能和抗冷热疲劳性能;延长M2高速钢模具使用寿命的热处理工艺优选为:采用(875±5)℃×3 h+(750±5)℃×5h分级退火,空冷;采用(500±5)℃×1 h预热+(1 200±5)℃×3 h淬火,油冷至200℃后空冷;采用(540±5)℃×6 h回火,空冷。
The M2 high-speed steel molds are heat-treated by different technologies, and the surface hardness, abrasion resistance and thermal-fatigue resistance of the samples are tested and analyzed. The results show that the heat treatment process after the fractional annealing and preheating and then quenching is conducive to refining the carbides in the M2 high speed steel mold to improve the surface hardness, wear resistance and thermal fatigue resistance; extend the service life of M2 high speed steel mold The heat treatment process is as follows: (875 ± 5) ℃ × 3 h + (750 ± 5) ℃ × 5h, 3 h quenching, oil cooling to 200 ℃ air cooling; using (540 ± 5) ℃ × 6 h tempering, air cooling.