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Thermodynamics and Kinetics Study on Improving the Microstructure of High Chromium Cast Iron by Multi-alloying

机译:多元合金化改善高铬铸铁组织的热力学和动力学研究

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摘要

The effects of multi-alloyings(V,Ti and Nb)on carbides precipitation and as-cast microstructure of eutectic high chromium cast iron containing 2.8 wt.%carbon and 31.0wt.%chromium were investigated.The results showed that with the increase in the amount of alloy elements,the cast microstructure of 2.8C-31Cr high chromium cast iron changed gradually from refinement to coarsening and the total volume fraction of carbides decreased.When the addition of alloy was0.4V-0.40Ti-0.40Nb-0.35Mo,the solidification microstructure was largely improved,the distribution of carbides was reasonably uniform.The existence form of strong carbides forming elements(V,Ti,Nb)and the reasons of microstructure change were investigated from thermodynamics and kinetics considerations.
机译:研究了多种合金(V,Ti和Nb)对碳含量为2.8wt%,铬含量为31.0wt%的共晶高铬铸铁的碳化物析出和铸态组织的影响。合金元素的添加量,2.8C-31Cr高铬铸铁的铸态组织从细化到粗化逐渐变化,碳化物的总体积分数降低。当合金添加量为0.4V-0.40Ti-0.40Nb-0.35Mo时从热力学和动力学的角度研究了强碳化物形成元素(V,Ti,Nb)的存在形式以及微观结构变化的原因。

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