超声波光整强化40Cr表层显微硬度研究  

Study on the Surface Layer Microhardness of 40Cr by Ultrasonic Finishing and Reinforcing Process

作　　者：鲁帅帅 昃向博[1] 付秀丽[1] 

机构地区：[1]济南大学机械工程学院

出　　处：《组合机床与自动化加工技术》2014年第12期27-29,33,共4页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家自然科学基金(51105172)

摘　　要：通过超声波光整强化工艺对40 Cr轴件回转面进行表面处理。利用显微硬度计分别对处理前后试样的厚度方向显微硬度进行测试,对比分布曲线发现该工艺可以明显提高材料表层显微硬度值,表面硬度值最高,达到46.4HRC,硬化层厚度为240-250μm,厚度方向显微硬度值呈梯度状态分布,硬度值有波动。利用扫描电子显微镜分别对处理前后试样表层组织进行观察,发现处理后试样表面粗糙度明显降低,表层组织同时得到细化,在零件表层形成厚度约5μm的流变层,其中晶粒沿轴向拉伸,呈扁平状。Enhance the surface of 40Cr shaft part through ultrasonic finishing and reinforcing process. Test the thickness direction microhardness values of samples treated and untreated respectively using micro hard-ness tester. Compared with the distribution curves it is found that this process can significantly improve ma-terial surface microhardness values. The surface hardness value is highest, which is 46. 4 HRC, and harden-ing layer thickness is from 240 to 250 μm. The distribution of thickness direction microhardness values is gradient state,and hardness values is fluctuated. Use scanning electron microscope to observe the sample treated and untreated surface organization respectively, and it is found that the surface roughness of sample treated is decreased obviously, at the same time surface organization is refined. It forms about 5μm thickness rheological layer On the surface of parts, and the grains stretched along the axial direction, which is flat shape.

关 键 词：超声波光整强化 40Cr 显微硬度 SEM 微观组织 

分 类 号：TH142[一般工业技术—材料科学与工程]