Effect of copper addition on grain refinement of austenite in Fe-8wt.%Ni-(0.3)Wt.% Cu alloy

Junaidi Syarif, and Zainuddin Sajuri, (2010) Effect of copper addition on grain refinement of austenite in Fe-8wt.%Ni-(0.3)Wt.% Cu alloy. Sains Malaysiana, 39 (6). pp. 999-1006. ISSN 0126-6039


Official URL: http://www.ukm.my/jsm/english_journals/vol39num6_2...


The effect of copper addition on martensitic structure and reversion from martensite to austenite behaviours upon heating were investigated to clarify mechanism of grain refinement of austenite in Fe-8wt.%Ni-Cu alloys. Upon water-quenching, the alloys underwent a martensitic transformation that exhibited a typical lath-martensitic structure. It was found that prior-austenite grain and martensite-packet sizes were refined with increasing copper content. The grain refinement was not due to a decrease of grain growth rate of the austenite. However, it was found that nucleation rate of the austenite on reversion was increased by the copper addition. In Fe-8wt.%Ni alloy heated in (austenite+ferrite) region, reversed austenite grains were formed at high angle boundaries such as prior austenite grain boundary and packet boundary. On the other hand, TEM observation of the Fe-8wt.%Ni-3wt.%Cu alloy revealed that fine copper particles precipitated within the martensitic structure and the reversed austenite grains also formed within lath-structures and lath boundary. It means that the copper addition promoted formation of the reversed austenite within martensitic matrix and resulted in the grain refinement of the prior-austenite in Fe-8wt.%Ni-Cu alloy.

Item Type:Article
Keywords:Austenite grain; copper addition; grain refinement; refinement martensitic steel; martensitic-austenitic reversion
Journal:Sains Malaysiana
ID Code:7445
Deposited By: Mr Fazli Nafiah -
Deposited On:13 Aug 2014 06:09
Last Modified:14 Dec 2016 06:44

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