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Cementites decomposition of a pearlitic ductile cast iron during graphitization annealing heat treatment
Alternative TitleCementites decomposition of a pearlitic ductile cast iron during graphitization annealing heat treatment
Gao Minqiang; Qu Yingdong; Li Guanglong; You Junhua; Li Rongde
2017
Source PublicationJOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
ISSN1006-706X
Volume24Issue:8Pages:838-843
AbstractCementites 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 degrees C, the tensile strength of pearlitic ductile cast iron was increased to a peak value at 0. 5 h, and decreased gradually thereafter but the elongation was enhanced with the increase of annealing time. Moreover, the diffusion coefficient of carbon atoms could he approximately calculated as 0. 56 mu m(2)/s that could he regarded as the short-range diffusion. As the holding time was short (0. 5 h), 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 740 MPa and elongation of 7% could he achieved after graphitization annealing heat treatment for 0. 5 h. Two principal factors should he 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 740 MPa.
Other AbstractCementites 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.
KeywordMECHANICAL-PROPERTIES GRAPHITE MICROSTRUCTURE Pearlitic ductile cast iron Cementite decomposition Diffusion Carbon atom Graphitization annealing heat treatment
Indexed ByCSCD
Language英语
Funding Project[Program for Innovative Research Team in University of Liaoning Province] ; [National Natural Science Foundation of China]
CSCD IDCSCD:6063472
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/148579
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
Gao Minqiang,Qu Yingdong,Li Guanglong,et al. Cementites decomposition of a pearlitic ductile cast iron during graphitization annealing heat treatment[J]. JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,2017,24(8):838-843.
APA Gao Minqiang,Qu Yingdong,Li Guanglong,You Junhua,&Li Rongde.(2017).Cementites decomposition of a pearlitic ductile cast iron during graphitization annealing heat treatment.JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,24(8),838-843.
MLA Gao Minqiang,et al."Cementites decomposition of a pearlitic ductile cast iron during graphitization annealing heat treatment".JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 24.8(2017):838-843.
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