| 1. |
- Dudrova, E, et al.
(author)
-
Improvement of Strength Properties of Fe-Cr-Mo-[Cu-Ni]-C Sintered Steels by Sinter-Hardening
- 2010
-
In: World Powder Metallurgy Congress and Exhibition, World PM 2010; Florence; Italy; 10 October 2010 through 14 October 2010. - 9781899072194 ; 3, s. 79-86
-
Conference paper (peer-reviewed)abstract
- The effect of high temperature sintering and high cooling rate on shifting the microstructure composition to favourably portion of high strength structures and thus strength properties improvement of the Fe-Cr-Mo-[Cu-Ni]-C sintered steels based on Astaloy CrL was investigated. All the systems were processed by both sinter-hardening and conventional sintering. The high temperature vacuum sintering (11800C) was integrated with high (6K/s), medium (3K/s) and slow (0.1K/s) cooling rates; the conventional sintering at 11800C with the cooling rate of ~0.17K/s was carried out in N2-rich atmosphere. Depending on chemical composition, the yield and tensile strengths of 890-1150 MPa and 913 -1230 MPa were achieved by the applied sinter-hardening. All the values are approximately double than those for pearlite/bainite structures after conventional sintering. Finally, basing on the microstructure composition and corresponding microhardness, the (theoretical) tensile strength of the “pore free” matrix was calculated. The difference between calculated and experimental tensile strength values was explained by microfractographic observations.
|
|
| 2. |
- Dudrova, Eva, et al.
(author)
-
MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Fe-Cr-Mo-[Cu-Ni]-C SINTERED STEELS
- 2010
-
In: Acta Metallurgica Slovaca - Conference. - 1338-1660. ; 1, s. 580-585
-
Journal article (peer-reviewed)abstract
- The effect of high-temperature vacuum sintering (11800C) integrated with high (6K/s), medium (3K/s) and slow (0.1K/s) cooling rates and conventional sintering at 11800C with cooling rate of ~0.17K/s on shifting the microstructural composition to significant portion of martensite-bainite and thus effective improvement of mechanical properties of Fe-Cr-Mo-[Cu-Ni]-C sintered steels (Astaloy Cr+1 and 2% Cu and/or 50% Distaloy AB powder was investigated. In dependence on chemical composition the yield and tensile strengths of 890-1150 MPa and 913-1230 MPa and impact energy of 10-15 J were achieved by sinter-hardening. The yield and tensile strengths were approximately double than those resulting from conventional sintering.
|
|
| 3. |
- Dudrova, Eva, et al.
(author)
-
Improvement of Mechanical Properties of Fe-Cr-Mo-[Cu-Ni]-C Sintered Sintered Steels by Sinter Hardening
- 2011
-
In: Materials Science Forum. - 1662-9752 .- 0255-5476. ; 672, s. 31-38
-
Journal article (peer-reviewed)abstract
- 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.
|
|
