摘要
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。
M2 high-speed steel die was heat-treated by different process. And the surface hardness, wear resistance and cold-thermal fatigue resistance of the die were tested and analyzed. The results show that grading annealing and preheating before quenching could refine the carbides in the microstructure of the die, and improve the surface hardness, wear resistance and cold-thermal fatigue resistance. Moreover, the optimized heat-treatment process to prolong service life was grading annealing at （750±5） ℃ for 5 h after annealed at （875±5）℃for 3 h, by air cooling, quenching at （1 200±5） ℃ for 3 h after pre-heated at （500±5）℃ for 1 h, by air cooling after oil cooling to 200 ℃, and tempering at （540±5） ℃ for 6 h, by air cooling.
出处
《铸造技术》
CAS
北大核心
2014年第5期961-963,共3页
Foundry Technology
关键词
高速钢模具
使用寿命
热处理工艺
分级退火
预热
high-speed steel die
service life
heat-treatment process
grading annealing
pre-heating
