Cementites decomposition of a pearlitic ductile cast iron during graphitization annealing heat treatment
查看参考文献26篇
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文摘
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Cementites decomposition of a pearlitic ductile cast iron during graphitization annealing heat treatment was investigated.Fractographies and microstructures of heat treated samples were observed using a scanning electron microscope and mechanical properties were measured by a universal tensile test machine. The results indicated that during isothermal annealing at 750°C,the tensile strength of pearlitic ductile cast iron was increased to a peak value at 0.5h,and decreased gradually thereafter but the elongation was enhanced with the increase of annealing time.Moreover,the diffusion coefficient of carbon atoms could be approximately calculated as 0.56μm2/s that could be regarded as the shortrange diffusion.As the holding time was short(0.5h),diffusion of carbon atoms was incomplete and mainly occurred around the graphites where the morphology of cementites changed from fragmentized shape to granular shape.In addition,the ductile cast iron with tensile strength of 740MPa and elongation of 7%could be achieved after graphitization annealing heat treatment for 0.5h.Two principal factors should be taken into account.First,the decomposition of a small amount of cementites was beneficial for increasing the ductility up to elongation of 7%.Second,the diffusion of carbon atoms from cementites to graphites could improve the binding force between graphites and matrix,enhancing the tensile strength to 740MPa. |
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来源
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Journal of Iron and Steel Research
, International,2017,24(8):838-843 【核心库】
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DOI
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10.1016/s1006-706x(17)30124-3
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关键词
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Pearlitic ductile cast iron
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Cementite decomposition
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Diffusion
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Carbon atom
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Graphitization annealing
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heat treatment
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地址
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School of Materials Science and Engineering,Shenyang University of Technology, Liaoning, Shenyang, 110870
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1006-706X |
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学科
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金属学与金属工艺 |
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基金
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supported by the Program for Innovative Research Team in University of Liaoning Province
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国家自然科学基金
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文献收藏号
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CSCD:6063472
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