Continuously cast ductile iron: Processing, structures, and properties

被引:36
作者
Chaengkham, Pongsak [1 ]
Srichandr, Panya [1 ]
机构
[1] King Mongkuts Univ Technol Thonburi, Sch Energy Environm & Mat, Bangkok, Thailand
关键词
Cast structure; Ductile iron; Fading effect; Horizontal continuous casting; MECHANICAL-PROPERTIES; MICROSTRUCTURE; FATIGUE; NICKEL;
D O I
10.1016/j.jmatprotec.2011.03.008
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ductile iron billets were continuously cast using a horizontal casting machine. The billets were cast successfully, and the overall quality of the billets was acceptable. The as-cast microstructure consisted of eutectic carbide, chunky carbide and graphite nodules in a pearlite matrix. The amount of carbide was relatively large compared with that in traditional sand castings. Graphite nodularity decreased as the melt was held for longer periods of time before casting after inoculation and nodularisation treatments. The fading effect was significant when the melt was held for 6 min and longer. Graphite nodularity was found to affect the tensile strength and elongation, but not hardness, of the billets. The surface quality of the billets was fair, although light waves and drawal marks were clearly visible. The billets had good roundness. The tensile strength was found to be between 410 and 550 MPa; the elongation was 2.5-4.0%; and the hardness was 520-550 HB. Possible approaches to improving the as-cast structure and the implications of this research are discussed. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:1372 / 1378
页数:7
相关论文
共 20 条
[1]  
Al-Ghonamy A., 2010, Int J Civil Environ Eng, V10, P1
[2]  
Bockus S, 2008, MATER SCI-MEDZG, V14, P115
[3]  
CHAENGKHAM P, 2009, P MAT SCI TECHN 2009, P1276
[4]  
CHAENGKHAM P, 2010, P INT C MAT PROC TEC, P174
[5]   Effect of rare earth element on microstructure formation and mechanical properties of thin wall ductile iron castings [J].
Choi, JO ;
Kim, JY ;
Choi, CO ;
Kim, JK ;
Rohatgi, PK .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 383 (02) :323-333
[6]  
Davis J.R., 1996, ASM SPECIALTY HDB CA, P54
[7]   Rolling contact fatigue resistance of ductile iron with different nodule counts and matrix microstructures [J].
Dommarco, R. C. ;
Jaureguiberry, A. J. ;
Sikora, J. A. .
WEAR, 2006, 261 (02) :172-179
[8]   Fracture toughness characterization of austempered ductile iron produced using both conventional and two-step austempering processes [J].
Elsayed, Ayman H. ;
Megahed, M. M. ;
Sadek, A. A. ;
Abouelela, K. M. .
MATERIALS & DESIGN, 2009, 30 (06) :1866-1877
[9]   C, Si and Ni as alloying elements to vary carbon equivalent of austenitic ductile cast iron: Microstructure and mechanical properties [J].
Fatahalla, Nabil ;
AbuElEzz, Aly ;
Semeida, Moenes .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2009, 504 (1-2) :81-89
[10]  
HENDERSON HE, 1993, DUCTILE IRON HDB, P167