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Effect of Boron and Heat Treatment on Mechanical Properties of White Cast Iron for Mining Application

Journal of Iron and Steel Research International 2011年第11期18卷 31-39页

作者： Havva kazdal Zeytin Hakan Yildirim Banu Berme Selim Duduoglu gürkan kazdal Adem Deniz TUBITAK MRC Duduoglu Steel Casting Industry and Trade Inc Co TuBITAK MRC Materials Institute Chemistry Metallurgy Faculty Istanbul Technical University

Heat treatment methods were applied to white cast iron for improving the impact and wear resistance. Additionally, chemical composition optimization was made. Furthermore, the effect of boron addition on such applica- tions was investigated. Samples were investigated by using optical and electron microscope methods. Hardness, wear and impact tests were conducted. The results showed that the secondary carbides in the standard alloy were iron-enriched, needle-like carbides M3C when the boron-added alloy contained Fe23 （C, B）6 type, globular secondary carbides. It was concluded that heat treatment B provided higher wear and hardness properties, compared to the stand- ard heat treatment. Optimum mechanical properties were obtained by lower destabilisation temperatures and increasing temperature reduced the wear resistance and hardness.

关键词： white cast iron mining application impact resistance wear toughness

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Effect of Intercritical Annealing Parameters on Dual Phase Behavior of Commercial Low-Alloyed Steels

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Journal of Iron and Steel Research International 2010年第4期17卷 73-78页

作者： Aydin Hüseyin kazdal Zeytin Havva Kubilay Ceylan TUBíTAK Marmara Research Center(MAM) Materials Institute

The effects of some intercritical annealing parameters including heating rate, soaking temperature, soaking time, and quench media on the microstructure and mechanical properties of cold-rolled dual phase steel were studied. The microstructure of specimens quenched after each annealing stage was analyzed using optical microscope. The tensile properties, determined for specimens submitted to complete annealing cycles, were influenced by the volume fractions of multiphases （originated from martensite, bainite, and retained austenite）, which depend on the annealing process parameters. The results obtained showed that the yield strength and the ultimate tensile strength increase with increasing the intercritical temperature and cooling rate. This can be explained by higher martensite volume ratio with the increased volume fraction of austenite formed at the higher temperatures and cooling rates.

关键词： dual phase steel carbon steel alloyed steel mechanical test metallography heat treatment

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Effect of Microstructure on Exhaust Manifold Cracks Produced From SiMo Ductile Iron

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Journal of Iron and Steel Research International 2009年第3期16卷 32-36页

作者： Havva kazdal Zeytin Ceylan Kubilay Hseyin Aydin Ali Aslan Ebrinc Bilal Aydemir TUBITAK MAM Materials Institute Ford Otosan A S

Ductile cast irons are used as high temperature materials in internal combustion engines,because they are microstructurally stable at high operating temperatures. SiMo granular graphite cast irons contain Fe2MoC and M6C carbide precipitates due to their higher concentration of both silicon and molybdenum. The microstructure of these cast irons consists of carbides dispersed within the ferrite matrix. The microstructural change and the crack formation mechanism in manifolds produced from SiMo ductile iron are studied. Chemical analysis,optical and scanning electron microscope studies have been completed and evaluated.

关键词： SiMo alloy cast iron exhaust manifold

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