Effect of carbide promoting elements on CGI material processing

• Due to environmental regulations, the industry uses both new and recycled material for the casting of new components. In the heavy truck industry, great effort is put into the purchasing of “good quality” recycled/scrap material to be used for casting CGI (compacted graphite iron) cylinder blocks and cylinder heads. Scrap material with a large concentration of carbide promoting elements reduces the machinability drastically due to carbides. The effect of carbide promoting elements on CGI machinability needs to be investigated in order to produce high quality engine components in an economically satisfactory way. This study presents the effect of the carbide promoting elements of chromium, manganese and molybdenum on CGI material processing. 17 unique CGI materials with different material chemical composition were studied. Material testing, milling experiments and image analysis of microstructure were performed on all materials, mapping the process machine interaction. The results show that all carbide promoting elements, but especially chromium, reduce the tool life in CGI milling. The results also illustrate the interaction between concentration of carbide promoting elements, material strength and machinability.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Produktionsteknik, arbetsvetenskap och ergonomi (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Production Engineering, Human Work Science and Ergonomics (hsv//eng)

Nyckelord

Milling

Carbides

Carbide Promoting Elements

Scrap Material

compacted

Manufacturing engineering

Produktionsteknik

SRA - Production

SRA - Produktion

Publikations- och innehållstyp

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