Title : ( Phase Transformation Study of Aluminium Containing Ductile irons by Dilatometry )
Authors: Ali Reza Kiani Rashid , Prof. David Edmonds ,Abstract
The temperature for the start of martensite formation (MS) for three Al-alloyed ductile irons containing 0.48%Al, 4.88%Al and 6.16%Al were determined by high-speed dilatatometry. Microscopic observation also were used to indicate the effects of aluminium addition on the martensite transformation during quenching. Various heat treatment cycles, with different continuous cooling and isothermal heat treatments, were used for the experimental irons to indicate the phase transformation in the solid state. The examination confirmed that an austenite/martensite transformation occurs for irons containing 0.48%Al and 4.88%Al . The results indicate that martensitic transformation occurs at about 200C for 0.48%Al and about 190C for 4.88%Al. Whereas there was no evidence of the martensitic transformation for 6.16% Al . It was further found that for the 4.88%Al experimental alloy used, isothermal transformation at 350 C for different soaking times gave a typical bainitic microstructure that increased with increasing time of austempering.
The temperature for the start of martensite formation (MS) for three Al-alloyed ductile irons containing 0.48%Al, 4.88%Al and 6.16%Al were determined by high-speed dilatatometry. Microscopic observation also were used to indicate the effects of aluminium addition on the martensite transformation during quenching. Various heat treatment cycles, with different continuous cooling and isothermal heat treatments, were used for the experimental irons to indicate the phase transformation in the solid state. The examination confirmed that an austenite/martensite transformation occurs for irons containing 0.48%Al and 4.88%Al . The results indicate that martensitic transformation occurs at about 200C for 0.48%Al and about 190C for 4.88%Al. Whereas there was no evidence of the martensitic transformation for 6.16% Al . It was further found that for the 4.88%Al experimental alloy used, isothermal transformation at 350 C for different soaking times gave a typical bainitic microstructure that increased with increasing time of austempering.
Keywords
, Phase transformation, Dilatometry, Ductile iron, Aluminium, Martensite, Austenite@inproceedings{paperid:1006813,
author = {Kiani Rashid, Ali Reza and Prof. David Edmonds},
title = {Phase Transformation Study of Aluminium Containing Ductile irons by Dilatometry},
booktitle = {7th European Symposium on Martensitic Transformations and Shape Memory Alloys 2006 : ESOMAT 2006},
year = {2006},
location = {بوخم, GERMANY},
keywords = {Phase transformation; Dilatometry; Ductile iron; Aluminium; Martensite; Austenite},
}
%0 Conference Proceedings
%T Phase Transformation Study of Aluminium Containing Ductile irons by Dilatometry
%A Kiani Rashid, Ali Reza
%A Prof. David Edmonds
%J 7th European Symposium on Martensitic Transformations and Shape Memory Alloys 2006 : ESOMAT 2006
%D 2006