Study of the austempering transformation kinetics in compacted graphite cast irons

被引：6
|
作者：
Gregorutti, R
Laneri, K
Desimoni, J [1 ]
Mercader, RC
机构：
[1] Lab Entrenamiento Multidisciplinario Invest Tecno, RA-1900 La Plata, Argentina
[2] Natl Univ La Plata, Fac Ciencias Exactas, Dept Fis, RA-1900 La Plata, Argentina
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2004年 / 35A卷 / 01期
关键词：
D O I：
10.1007/s11661-004-0113-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, the phases involved in the transformation austenite --> ferrite + high-carbon austenite in cast irons were assessed by means of Mossbauer spectroscopy and hardness measurements for samples austempered at five different temperatures between 573 and 673 K with two Mn contents. The C content in the high-carbon austenite was found to have a dependence of t(0.4+/-0.05) on the austempering time t, which evidences that diffusion of carbon has taken place. The kinetic parameter k determined using the Johnson-Mehl-Avrami equation has a maximum of 3.9 X 10(-3) (s(-1)) at 623 K and corroborates that Mn slows the transformation rate.
引用
收藏
页码：103 / 110
页数：8
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