摘要
为了提高模具用V3N高速钢表面电沉积CrC膜的性能,通过调整热处理温度(保温1.5 h)的方式来对其进行加强,对比了各工艺下获得的膜组织形态、表面硬度与耐蚀能力。研究结果表明:随着热处理温度的提高形成了更加粗糙的CrC膜,强度获得了明显提升;在表面区域形成了不同数量的白色颗粒,并且数量明显增加;热处理前CrC膜硬度达752 HV,提高温度后,膜硬度下降;以650℃进行1.5 h保温处理得到最低硬度的膜,相对于热处理前膜组织减小30%以上。大部分腐蚀产物都存在于膜的微裂纹上及附近区域。热处理后CrC膜腐蚀形成了絮状腐蚀产物,同时在靠近裂纹的区域形成了球形腐蚀产物。
In order to improve the performance of electrodeposited CrC films on the surface of V3 N high speed steel used in the mould,the sample was strengthened by adjusting the heat treatment temperature(holding for 1.5 h).The microstructure,surface hardness and corrosion resistance of the films obtained under various process were compared.Results showed that with the increase of heat treatment temperature,the CrC-film was formed more coarsely,and the strength was improved obviously.In addition,different amounts of white particles were formed in the surface area.Before heat treatment,the CrC membrane tissue reached 752 HV hardness.After increasing the temperature,the film hardness decreased.Furthermore,the film with the lowest hardness was obtained by 1.5 h heat preservation treatment at 650℃,the structure of which was reduced by more than 30%of that before heat treatment.Most of the corrosion products were found on and around the microcracks of the membrane.After heat treatment,CrC film corrosion formed a flocculent corrosion product,while some spherical corrosion products were generated in the area close to the crack.
作者
常灿光
CHANG Can-guang(Department of Mechanical and Electrical Engineering,Zhengzhou City Vocational College,Zhengzhou 452370,China)
出处
《材料保护》
CAS
CSCD
2021年第5期94-97,102,共5页
Materials Protection
关键词
CrC膜
电沉积
热处理
组织结构
耐蚀性
CrC film
electrodeposition
heat treatment
microstructure
corrosion resistance
