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Grain coarsening in FeNiCr alloys and the influence of second phase particles

✍ Scribed by A.K. Koul; F.B. Pickering


Publisher
Elsevier Science
Year
1982
Weight
631 KB
Volume
30
Category
Article
ISSN
0001-6160

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✦ Synopsis


The effects of second phase particles, e.g. kf2,C6. MC and M(C, N) carbides on the grain growth phenomenon of Fe-Ni-Cr alloys have been determined. Various theoretical models on grain coarsening have been compared. The grain size at all stages of grain coarsening was dependent on the undissolved carbide particle size (r). the volume fraction (f), and the nature of the carbides. The nature of M2,C6 carbides varied, since Fe, Ni and 510 entered the M,,&, unit cell; and complex carbides such as (CrL5Fe4NiLMo2)C6 were formed. Gladman's equation was verified for predicting the observed grain size values to a significant degree, and other models were less successful. Rbumk-Nous avons etudit I'influence de particules dune seconde phase telle que les carbures Mz,C6, MC et M(C, N) sur la croissance des grains dans des alliages Fe-Ni-Cr. Nous avons compare divers modeles theoriques du grossissement des grains. A tous les stades, le grossissement des grains dependait de la taille (r) des particuies de carbures non dissoutes, de la fraction volumique (f, et de la nature des carbures. La nature des carbures M2,C6 variait, puisque Fe, Ni et MO ptnitraient dans la maille elementaire Ms,C, et on observait la formation de carbures complexes, tels que (Cr,, Fe,Ni2M02)C6. NOUS avons trouve que I'equation de Gladman permet de prtvoir de manitre significative les valeurs experimentales de la taille des grains, alors que d'autres modeles ont moins de succes B cet tgard. Zusammenfassung-Der EinfluB von Teilchen einer zweiten Phase, wie Mt,C6, MC und M (C. N)-Karbide, auf das Kornwachstum wurde an Fe-Ni-Cr-Legierungen untersucht. Verschiedene theoretische Modelle der Kornvergriiberung werden miteinander verglichen. Bei timtlichen Stufen der Kornvergroberung hing die KorngroBe von der GroBe r der nicht aufgelosten Karbidteilchen, dem Volumanteil fund der Art des Karbids ab. Die Art der M,, C6-Karbide war unterschiedlich, da Fe, Ni und MO in die ML3Cs-Einheitszelle eingebaut wurden. Dadurch entstanden komplexe Karbide wie etwa (0, ,Fe,Ni,Mo,)C,. Die Gleichung von Gladman beschreibt die beobachteten KorngroBen bemerkenswert gut. wohingegen andere Modelle weniger gut sind.


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