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采用不同工艺对DAC 55压铸模具进行热处理,利用高温洛氏硬度计、摩擦磨损试验机和箱式电阻炉对试样的高温硬度、高温磨损性能和热疲劳性能进行测试与分析。结果表明,适当的热处理可以提高DAC 55压铸模具的高温硬度、耐高温磨损性能和抗热疲劳性能。与未进行热处理的试样相比,分级淬火和(600±10)℃二次回火可使DAC55压铸模具在200℃和500℃下的表面硬度分别提高16.3 HRC和19 HRC,磨损体积分别减小96.07%和92.51%。
The DAC 55 die-casting molds were heat-treated by different techniques. The high-temperature hardness, high-temperature wear resistance and thermal fatigue properties of the samples were tested and analyzed by using high-temperature Rockwell hardness tester, friction and wear tester and box resistance furnace. The results show that proper heat treatment can improve the high temperature hardness, high temperature wear resistance and thermal fatigue resistance of DAC 55 die-casting mold. Graded hardening and secondary tempering at (600 ± 10) ℃ increased the surface hardness of DAC55 die-casting mold at 200 ℃ and 500 ℃ by 16.3 HRC and 19 HRC, respectively, compared with those without heat treatment. The wear volume decreased 96.07% and 92.51%.