Improvement of Mechanical Properties of Fe-Cr-Mo-[Cu-Ni]-C Sintered Sintered Steels by Sinter Hardening

• The effect of high temperature sintering and high cooling rate on shifting themicrostructural composition to the favourably of martensite-bainite structures and thus effectiveimprovement of mechanical properties of sintered steels based on Astaloy CrL powder with anaddition of 1 and 2% Cu or 50% Distaloy AB powder and 0.65% C was investigated. All thesystems were processed by both sinter-hardening and conventional sintering. The vacuum sinteringat high-temperature of 1240 0C and at common temperature of 1180 0C were integrated with high(6 0C/s), medium (3 0C/s) and slow (0.1 0C/s) cooling rates; conventional sintering at 1180 0C withcooling rate of ~0.17 0C/s was carried out in a N2+10%H2 atmosphere. In dependence on chemicalcomposition, the yield and tensile strengths of 890-1150 MPa and 913-1230 MPa respectively andimpact energy of 10-15 J were achieved by sinter-hardening. The yield and tensile strengths areapproximately double than those resulting from conventional sintering.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Annan materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Other Materials Engineering (hsv//eng)

Nyckelord

microstructure

fractography

mechanical properties

sinter-hardening

Sintered steels

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