中国铸造2007，Vol.4Issue(2)：120-123,4.
Effect of sub-zero cooling on microstructure and mechanical properties of a low alloyed austempered ductile iron
Effect of sub-zero cooling on microstructure and mechanical properties of a low alloyed austempered ductile iron
S. Yazdani 1M. Ardestani1
作者信息
- 1. Faculty of Materials Engineering, Sahand University of Technology, Tabriz, IRAN
- 折叠
摘要
Abstract
The effect of sub-zero cooling on microstructure and mechanical properties of a low alloyed austempered ductile iron has been investigated. Austempering of samples was performed at 325 ℃ and 400 ℃after austenitizing at 875 ℃ and 950 ℃. The sub-zero treatments were carried out by cooling down the samples to -30 ℃, -70 ℃ and -196 ℃. The changes in volume fraction of austenite and mechanical properties were determined after cooling to each temperature. The austenite volume fraction of samples which were austenitized at 875 ℃ and austempered at 325 ℃ remained unchanged, whilst it reduced in samples austenitized at 950 ℃ and 875 ℃ for austempering temperature of 400 ℃. In these specimens, some austenite transformed to martensite after subzero cooling. Mechanical property measurements showed a slight increase in strength and hardness and decrease in elongation and toughness due to this transformation behavior.关键词
austempered ductile iron/austenite/sub-zero cooling/martensitic transformation/ausferriteKey words
austempered ductile iron/austenite/sub-zero cooling/martensitic transformation/ausferrite分类
矿业与冶金引用本文复制引用
S. Yazdani,M. Ardestani..Effect of sub-zero cooling on microstructure and mechanical properties of a low alloyed austempered ductile iron[J].中国铸造,2007,4(2):120-123,4.
