摘要
为了提高SKD61模具钢表面的硬度和抗疲劳性能,采用激光熔凝处理方法对模具钢进行表面强化,利用光学显微镜、扫描电镜及附带的能谱仪等分析了SKD61钢激光熔凝处理区的显微组织和化学成分,测试了不同区域的显微硬度,并对处理后的模具进行使用试验。结果表明:激光熔凝处理后SKD61钢组织分为熔凝区、热影响区和基体三层,熔凝区组织为极细的等轴晶和柱状晶,消除了夹杂相,合金元素基本均匀分布;与常规热处理相比,熔凝区的显微硬度显著提高;经激光熔凝处理的SKD61钢顶盖压铸模具的使用寿命提高了1倍以上。
In order to improve the surface hardness and anti-fatigue properties, the SKD61 die steel was strengthened by laser-remelting. The microstructure and chemical composition distribution of SKD61 steel after laser-remelting were observed and analyzed by optical microscopy （OM）, scanning electron microscopy （SEM） and energy dispersive X-ray spectrometer （EDS）. The hardness of laser melted zone and the service life of the processed die-casting die were also tested. The results show that SKD61 steel had three layer structures,including the melting zone,heat affected zone and base metal. The microstructure of melted zone was very fine equiaxial crystal and columnar crystal, and the impurity phase was eliminated. The alloying elements distributed uniformly after laser- remelting process. Compared with conventional heat treatment, the microhardness of melted zone increased significantly. The service life of SKD61 steel top cover die-casting die had more than doubled after laser-remelting.
出处
《机械工程材料》
CAS
CSCD
北大核心
2014年第8期39-43,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51275468)
浙江省自然科学基金资助项目(Y1110262)
宁波自然科学基金资助项目(2011A610148)
宁波市重大择优资助项目(2011B1007)
