Phase transition and microstructure investigation of perferritic isothermed ductile iron (IDI)

IF 1.3 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

International Journal of Cast Metals Research Pub Date : 2020-10-21 DOI:10.1080/13640461.2020.1833477

M. Landesberger, R. Koos, Maximilian Erber, Matteo Pernumian, S. Masaggia, M. Hoelzel, W. Volk

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Abstract

ABSTRACT Optical analysis, dilatometry as well as neutron diffraction are utilised to investigate the phase transition within ductile iron both in-situ and after the heat treatment process for perferritic isothermed ductile iron (IDI). A suitable annealing temperature is chosen by calculating a phase diagram for the investigated alloy. The phase transition which happens slightly above upper intercritical temperature is followed by neutron diffraction, while dilatometry elucidates the IDI microstructure evolution for cooling rates from 40 to 0.125 K/s. The dilatometry results are visualised in a CCT diagram and further investigated with metallography. An additionally used colour etching method is basis for discussing the formation of the pearlitic/ferritic network. The presence of 2 vol.-% of ferrite was sufficient to achieve the typical IDI microstructure. Finally, the cementite phase volume fractions and crystal structure are evaluated. . The lattice constants of ferrite and cementite were independent of the formed microstructure.

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过铁素体等温球墨铸铁(IDI)的相变及显微组织研究

摘要利用光学分析、膨胀计和中子衍射研究了全铁等温球墨铸铁（IDI）在原位和热处理后的相变。通过计算所研究合金的相图来选择合适的退火温度。相变发生在略高于上临界温度的温度之后是中子衍射，而膨胀计阐明了在40至0.125K/s的冷却速率下IDI微观结构的演变。膨胀测量结果在CCT图中可视化，并用金相学进行进一步研究。另外使用的彩色蚀刻方法是讨论珠光体/铁素体网络形成的基础。2体积%铁氧体的存在足以实现典型的IDI微观结构。最后，对渗碳体的相体积分数和晶体结构进行了评价。铁素体和渗碳体的晶格常数与所形成的微观结构无关。

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来源期刊

International Journal of Cast Metals Research 工程技术-冶金工程

CiteScore

2.70

自引率

7.10%

发文量

审稿时长

7.5 months

期刊介绍： The International Journal of Cast Metals Research is devoted to the dissemination of peer reviewed information on the science and engineering of cast metals, solidification and casting processes. Assured production of high integrity castings requires an integrated approach that optimises casting, mould and gating design; mould materials and binders; alloy composition and microstructure; metal melting, modification and handling; dimensional control; and finishing and post-treatment of the casting. The Journal reports advances in both the fundamental science and materials and production engineering contributing to the successful manufacture of fit for purpose castings.