| Effect of sub-zero cooling on microstructure and mechanical properties of a low alloyed austempered ductile iron |
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| 作者姓名： | S. Yazdani M. Ardestani |
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| 作者单位： | Faculty of Materials Engineering Sahand University of Technology，Tabriz，IRAN，Faculty of Materials Engineering，Sahand University of Technology，Tabriz，IRAN |
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| 摘 要： | 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.
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| 关 键 词： | 零下冷却 奥氏体回火 低合金化锻铁 显微结构 力学性质 |
Effect of sub-zero cooling on microstructure and mechanical properties of austempered a low alloyed ductile iron |
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| S. Yazdani,M. Ardestani.Effect of sub-zero cooling on microstructure and mechanical properties of a low alloyed austempered ductile iron[J].China Foundry,2007,4(2):120-123. |
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| Authors: | S Yazdani M Ardestani |
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| Affiliation: | Faculty of Materials Engineering, Sahand University of Technology, Tabriz, IRAN |
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| 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. |
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| Keywords: | austempered ductile iron austenite sub-zero cooling martensitic transformation ausferrite |
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