Szczegóły publikacji
Opis bibliograficzny
Structure and mechanical properties of $Mn-Cr-Mo$ PM steels sintered in different conditions — Struktura i własności mechaniczne spiekanych stali manganowo-chromowo-molibdenowych wytwarzanych w różnych warunkach / M. SUŁOWSKI // Archives of Metallurgy and Materials / Polish Academy of Sciences. Committee of Metallurgy. Institute of Metallurgy and Materials Science ; ISSN 1733-3490. — 2007 — vol. 52 iss. 4, s. 617–625. — Bibliogr. s. 625
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Dane bibliometryczne
| ID BaDAP | 37699 |
|---|---|
| Data dodania do BaDAP | 2008-02-27 |
| Rok publikacji | 2007 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Archives of Metallurgy and Materials |
Abstract
The effect of H-2/N-2 ratio in a sintering atmosphere on microstructure and mechanical properties of Fe-3%Mn(Cr)-(Mo)-0.3%C PM steels has been shown. Pre-alloyed Astaloy CrL (1.5 wt.-%Cr and 0.25 wt.-% Mo) and Astaloy CrM (3 wt.-%Cr and 0.5 wt.-% Mo) powders were used to prepare the mixtures with low-carbon ferromanganese (77 wt.-% Mn and 1.3 wt.-% C) and graphite powders. Single-pressed compacts containing 3 wt.-% Mn and 0.3 wt.-% C with green density in the range of 6.8-7.1 gcm(-3) were produced. Sintering was carried out at 1120 degrees C and 1250 degrees C for 60 minutes under flowing different H-2/H-2 mixtures: - A1 - 75 vol. % H-2-25 vol. % N2, - A2 - 25 vol. % H-2-75 vol. % N2, - A3 - 5 vol. % H-2-95 vol. % N2, - A4 - 100 vol. % N2. After isothermal sintering specimens were slow (similar to 2 degrees C/min) cooled to room temperature. Tensile (UTS) and transverse rupture (TRS) strengths, elongation (A), R-0.2 yield offset, Young's modulus (E), impact toughness and apparent surface hardness were examined. Following mechanical tests, to investigate the microstructure of sintered Mn-Cr-Mo steels, light optical microscopy was employed. It was shown that sintered properties are hardly influenced by the imposed sintering atmospheres. The best combination of plastic and tensile properties of examined steels was achieved after sintering in hydrogen-rich atmospheres.
