Minimal lubrication machining of aluminium alloys

Green machining of powder-metallurgy-steels (PMS): An overview

303LSC stainless steel powder was mixed with silicon powder; the powder mixture was then compacted and sintered at 1250 °C in bottle hydrogen. The sintered alloys were exposed to 800 °C to investigate the effect of silicon content and aging tome on density, hardness, toughness and corrosion resistance of the aged alloys. Experimental results show that the density and hardness of sintered alloys increase with increasing silicon content and aging time. σ-Phase precipitates during the aging treatment; the morphology and chemical composition of this precipitated phase vary markedly with the aging time. Variation of toughness is discussed as the consequence of two competition mechanisms σ-phase precipitation and porosity modification. Increasing silicon content and aging time decreases the corrosion resistance.

Effect of silicon content and aging time on density, hardness, toughness and corrosion resistance of sintered 303LSC-Si stainless steels

This study deals with the quantitative evaluation of the machinability of sintered steels during drilling operations. A characterisation technique using scanning electron microscopy and image analysis was developed to characterise quantitatively the amount of flank wear on drillbits. It was shown experimentally, using a drilling test bench, that the evolution of flank wear was proportional to the rate of variation of the thrust force as measured during drilling. Thus, the results show that the slope of the linear region measured on the curve of the thrust force v. the amount of material removed is a more accurate criterion to characterise the machinability of PM products than the average thrust force, which is often suggested in the literature.Furthermore, the effect of the technique used to add MnS to PM powders was investigated. Quantitative characterisation of machinability during drilling operations showed that parts made with steel powders of the type FC–0208 + 0·5 wt-%MnS machine better when...

Characterisation of machinability of sintered steels during drilling operations

The constant demand for improved mechanical properties and lower production costs of PM parts has lead to the development of sinter hardenable steel powders. These powders produce fully martensitic microstructures by appropriately controlling the cooling rate during the sintering operation. Thus, the heat treatment operation (oil quenching) that would generally be required to obtain hardened parts can be eliminated. However, machining of the relatively hard sinter hardened parts is difficult.It then becomes critical to optimise the tool selection and the machining conditions, such as surface speed and feed. This paper presents guidelines for the turning and drilling of parts made with sinter hardenable powders, as well as a discussion on the effect of manganese sulphide particles and chip formation during turning.

Turning and drilling of parts made from sinter hardenable steel powders

On the Machinability of Powder Metallurgy Austenitic Stainless Steels

Etude experimentale de l'influence de la porosite d'un acier inoxydable austenitique 304L fritte sur son usinabilite. Celle-ci a ete evaluee a partir de l'usure et de la duree de vie des forets helicoidaux lors d'operations de percage

Drillability of 304L stainless steel P/M materials: tool wear and life

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On the Machinability of Powder Metallurgy Austenitic Stainless Steels

Drillability of 304L stainless steel P/M materials: tool wear and life