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Effect of Yttrium and Magnesium Segregation on Microstructure and Mechanical Properties of Heavy Section Ductile Iron Castings Weiping Chen1,a, Zhe Liu1, b, Yu Deng1, Jie Luo1, and Yongcheng Chen2,c 1 State Engineering Research Center for Metallic Materials Net-shape Processing,School of Mechanical and Automotive Engineering,South China University of Technology, Guangzhou 510640,China 2 Zhongtian Chuangzhan Magnesium Iron Co., Ltd., Foshan,528313,China amewpchen@scut.edu.cn, bliuzhe2012@hotmail.com, csdzhongtian@126.com Key words: Heavy section ductile iron, Chunky graphite, Mechanical properties Abstract: Ductile iron specimen with dimensions of Φ590mm×800mm were prepared by treating the melt with an yttrium-containing nodulizer.
Experimental Material and Procedure Table 1 shows the raw materials and their chemical compositions.
Table 1 Raw materials and their chemical compositions for the ductile iron casting Φ590mm×800mm Raw materials Major component content[wt.% ] C Si Mn S P Mg Ca Ba Al Y Cu Fe Pig iron 4.02 0.24 0.04 0.02 0.019 ____ ____ ____ ____ ____ ____ Bal.
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Introduction With recent development and application of composite materials and structures in civil engineering, the analysis of fracture mechanisms of interface bond between the conventional materials and composites has received a lot of interest.
As the stress near the interface edge of dissimilar materials and at the tip of interface crack is oscillatory singularity [1], besides the strength and service life of interface is different from the base metal, the traditional strength evaluation method is not used to evaluate the strength of dissimilar materials or interface fracture behaviors, such as the stress in material mechanics.
Therefore it is necessary to develop a characterization methodology, which can measure the fracture toughness of combinatorial materials.
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It’s usually used as highly reliable and precision materials.
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Other parts for material properties: 45steel,density is 7.85E-006Kg/mm3, elastic modulus is 2.1E+005Mpa, Poisson’s ratio is 0.31.
Acknowledgement Project supported by the Natural Science Foundation of Hunan Province, China(10JJ9005).
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So a critical stress σf is defined that when the applied stress is less than it, the creep fracture will not occur, and when the applied stress is greater than it, the creep deformation will continue until the creep fracture (Curve 2, dashed line).This critical stress is called the long-term strength of materials [2].
(20) It can be seen that the whole creep process of materials is expressed by the model.
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The result shows that due to heat concentration around the oblique-elliptical embedding crack tip, the crack tip temperature exceeds the melting point of materials and small welded joints are formed by metal melting.
Temperature exceeds the melting point of the material and the tip is passivated.
Acknowledgement This paper is supported by National Natural Science Foundation of China No.51075351 and No.51105325.
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A special issue of the journal Engineering Fracture Mechanics, containing 15 articles on this topic, is in preparation and will be published later in 2007.
It can also be interpreted as the critical size of the damage zone at failure, for quasi-brittle materials which develop diffuse zones of damage at stress concentrations.
Further evidence for an approximate relationship between L and the critical damage zone size can be found in quasi-brittle materials such as fibre composites (for which L values are typically 1-3mm) and in construction materials such as mortars and concretes which have critical distances of the order of centimeters.
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