Shrinkage porosity criteria and optimized design of a 100-ton 30Cr(2)Ni(4)MoV forging ingot

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	Shrinkage porosity criteria and optimized design of a 100-ton 30Cr(2)Ni(4)MoV forging ingot
	J. Q. Wang; P. X. Fu; H. W. Liu; D. Z. Li; Y. Y. Li
	2012
发表期刊	Materials & Design
ISSN	0261-3069
卷号	35 页码:446-456
摘要	The heavy 30Cr(2)Ni(4)MoV forging ingots have been extensively used to fabricate the low-pressure rotors, which play a crucial role in the large nuclear power plant. However, the quality of the heavy ingots has been commonly affected by various inner defects. One of the most typical defects is the centerline shrinkage porosity, which has been found to be always accompanied by inclusions and macrosegregation. Within this context, a 100-ton 30Cr(2)Ni(4)MoV ingot was cut and the axle plane of it was analyzed to observe the distribution and size of the shrinkage porosity in the sectioned surface. On basis of these experimental results, through the FEM (Finite Element Method) simulation several criteria of the centerline shrinkage porosity have been clarified. Of them, the best criterion has been found to be the condition wunder G=R-s(0:5)<2.5 degrees C s(0.5) mm (1.5) (G and R-s are the temperature gradient and solidification rate, respectively). With this criterion, the distribution and size of the simulated centerline shrinkage porosity agree well with the experimental results observed by the sectioning and ultrasonic testing. Subsequently, by utilizing the optimized design, the simulated results uncovered that the centerline shrinkage porosity could be nearly eliminated. Thereby, offering a possibility by significantly improving the performance for the nuclear power low-pressure rotors. (C) 2011 Elsevier Ltd. All rights reserved.
部门归属	[wang, jiaqi; fu, paixian; liu, hongwei; li, dianzhong; li, yiyi] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;li, dz (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china.;dzli@imr.ac.cn
关键词	Ferrous Metals And Alloys Casting Shrinkage Castings
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60293
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Q. Wang,P. X. Fu,H. W. Liu,et al. Shrinkage porosity criteria and optimized design of a 100-ton 30Cr(2)Ni(4)MoV forging ingot[J]. Materials & Design,2012,35:446-456.
APA	J. Q. Wang,P. X. Fu,H. W. Liu,D. Z. Li,&Y. Y. Li.(2012).Shrinkage porosity criteria and optimized design of a 100-ton 30Cr(2)Ni(4)MoV forging ingot.Materials & Design,35,446-456.
MLA	J. Q. Wang,et al."Shrinkage porosity criteria and optimized design of a 100-ton 30Cr(2)Ni(4)MoV forging ingot".Materials & Design 35(2012):446-456.