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Abstract

The hardenability of some PM steels designed for heat treatment has been evaluated on sintered steel specimens by applying the procedure standardised with the Jominy end quench test. The samples have been produced using two types of commercial powders, frequently selected for exacting applications. Manufacturing process includes admixing with graphite and lubricant, compaction at about 7·0 g cm⁻³ density and sintering at 1393 K for 30 min in industrial equipment. In order to investigate the thermal behaviour of the tested steels, during the cooling after austenitising, the temperatures inside the Jominy samples at different positions have been recorded. Hardness values and cooling rates have been correlated to an in depth microstructural analysis and microhardness profiles, finding a good agreement. The results can be utilised for a more reliable applications.

Keywords

HARDENABILITY HEAT TREATMENT JOMINY TEST POWDER METALLURGY SINTERED STEEL

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Jominy test applied to PM steels for heat treatment

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