Influence of melt treatments and polished CVD diamond coated insert on cutting force and surface integrity in turning of Al�??7Si and Al�??7Si�??2.5Cu cast alloys

Bulletin of materials science

M Chakraborty²  P G Mukunda²  K G Basavakumar¹ 

[1] Department of Mechanical Engineering, Sri Bhagwan Mahavir Jain College of Engineering, Bangalore 562 112, India$$Department of Mechanical Engineering, Sri Bhagwan Mahavir Jain College of Engineering, Bangalore 562 112, IndiaDepartment of Mechanical Engineering, Sri Bhagwan Mahavir Jain College of Engineering, Bangalore 562 112, India$$;Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, India$$Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, IndiaDepartment of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur 721 302, India$$

关键词: Grain refinement;    modification;    machining;    Alâ€�??7Si;    Alâ€�??7Siâ€�??2.5Cu cast alloys.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The microstructures, machinability and surface characteristics of Alâ€�??7Si and Alâ€�??7Siâ€�??2.5Cu cast alloys were studied after various melt treatments like grain refinement and modification. The results indicate that combined grain refined and modified Alâ€�??7Siâ€�??2.5Cu cast alloys have microstructures consisting of uniformly distributed ð›�?-Al grains, eutectic Al-silicon and fine CuAl₂ particles in the interdendritic region. These alloys exhibited better machinability and surface characteristics in the cast condition compared with the same alloy subjected to only grain refinement or modification. Performances of the turning inserts (uncoated and polished CVD diamond coated) were evaluated in machining Alâ€�??7Si and Alâ€�??7Siâ€�??2.5Cu cast alloys under dry environment using a lathe. The polished CVD diamond coated insert outperformed the uncoated cutting insert which suffered from sizeable edge buildup leading to higher cutting force and poor surface finish. The polished CVD diamond coated insert shows a very small steady wear without flaking of the diamond film during cutting. This paper attempts to investigate the influence of grain refinement, modification and combined action of both on the microstructural changes in the Alâ€�??7Si and Alâ€�??7Siâ€�??2.5Cu cast alloys and their machinability and surface finish when different turning inserts are used.

【 授权许可】

Unknown