深冷处理对冷作模具D2钢性能的影响分析

Analysis on Effect of Deep Cryogenic Treatment on Performance of Cold Die Steel D2

对冷作模具D2钢进行不同的深冷处理,并进行了显微组织、表面硬度、耐磨性和冲击韧度的测试与分析。结果表明,深冷处理,尤其是淬火回火后再进行深冷处理,有利于促进钢中碳化物的弥散分布,提高表面硬度、耐磨性和冲击韧度;淬火回火后进行-196℃×2 h深冷处理的冷作模具D2钢,其表面硬度较未经深冷处理试样提高5.38%,20℃磨损体积减少68.89%、200℃磨损体积减少77.74%,冲击韧度提高40.80%。

Cold die steel D2 was deep cryogenic treated by different processes. And the microstructure, surface hardness, wear resistance and impact toughness were tested and analyzed. The results show that deep cryogenic treatment, especially, deep cryogenic treatment after quenching and tempering, was beneficial in making carbides evenly disperse in the steel, and improving the surface hardness, wear resistance and impact toughness of cold die steel D2. Deep cryogenic treatment at -196 ℃ for 2 h after quenching and tempering can increase by 5.38% than the steel without deep cryogenic treatment on surface hardness. Wear volume at 20 ℃ decreases by 68.89%, wear volume at 200 ℃ decreases by 77.74%, and impact toughness increases by 40.80%.