表面纳米化改性对铁基模具组织与性能的影响  

Effect of Surface Nanocrystallization Modification on Microstructure and Properties of Iron-based Die

作　　者：龚厚仙[1] 卫英 GONG Houxian1, WEI Ying2(1. Department of Automotive Engineering, Chuzhou Vocational and Technical College, Chuzhou 239000, China; 2. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]滁州职业技术学院汽车工程系,安徽滁州239000 [2]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《铸造技术》2018年第10期2417-2419,共3页Foundry Technology

基　　金：安徽省教育厅人才项目(gxfx2017224)

摘　　要：采用粗糙度测试、金相显微技术、扫描电子显微技术和X射线衍射分析等方法研究了不同表面纳米化时间下的铁基模具的微观组织、粗糙度、物相组成和硬度。结果表明,对铁基模具进行表面纳米化处理后,其表面粗糙度明显提高,且随着纳米化时间的延长,表面粗糙度不断增大;纳米化改性后的截面形貌可分为3个特征区域:流变层、过渡层和基体层;在其它工艺参数不变的条件下,纳米化时间越长则表层晶粒尺寸越小;经过纳米化处理后表层硬度相对原始态基材的硬度更高,原因在于纳米化过程中表层发生了细晶强化和形变强化。The roughness, phase composition and hardness of iron-based die with different time of nano surface treatment were studied by rough degree tester, metallographic microscope, scanning electron microscope and X-ray diffraction analysis method. The results show that the surface roughness of iron-based die steel increase after surface nanocrystallization, the surface roughness will be increased with the prolongation of nano time. Nano modified cross-section morphology can be divided into three regions, rheological layer, transition layer and the substrate layer. Under the condition that other technological parameters remain unchanged, the nanoidization time is more long, the surface grain size will be smaller. The surface hardness is higher than that of the original substrates after the nano treatment, which is because of the fine grain strengthening and deformation strengthening of the surface during the nano treatment.

关 键 词：表面纳米化 铁基 粗糙度 组织 硬度 

分 类 号：TG156[金属学及工艺—热处理] TG113[金属学及工艺—金属学]