Naslov
Achieving specified properties of ductile cast iron by correction annealing

Autori
Cajner, Franjo ; Landek, Darko ; Cajner, Hrvoje

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 15th IFHTSE and SMT 20 Congress / Jäger, Heimo - Beč : ASMET, 2006

Skup
15th IFHTSE and SMT 20 Congress

Mjesto i datum
Beč, Austrija, 25.09.2006. - 29.09.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ductile iron; ferritic ductile iron; correction heat treatment; hardenability

Sažetak
The paper presents the investigations of the process parameters for the correction heat treatment following casting process. The correction treatments are investigated for two different purposes: for achieving the specified impact toughness and for achieving good hardenability on the ferritic ductile iron. In both cases the optimal annealing parameters (time, temperature and cooling rate) are determined by applying modern statistical and quantitative methods on the results of microstructure analysis and tests of mechanical properties (determinations of strength, elongations and impact toughness). In the first case, by using the adequate annealing with slow cooling the impact toughness of the ferritic ductile iron (specified for the grade GGG 40.3) was increased from 4.2 J (as cast) to above 14 J after the correction annealing. In the second case, in order to achieve a satisfactory hardenability of the ferritic nodular iron (GGG 40) the graphite content was reduced from 7.9 % (as cast) to 3.4 % after a correction heat treatment. Subsequently, the hardness of about 58 HRC was obtained after quenching in oil.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA