Heavy-Section Ductile Iron Castings

2017 ◽  
pp. 629-644 ◽  
Keyword(s):  
Ductile Iron ◽  
Iron Castings ◽  
Heavy Section

scholarly journals Experimental Evidence for Metallurgical Modification Associated to Chunky Graphite in Heavy-Section Ductile Iron Castings

2012 ◽  
Vol 6 (1) ◽  
pp. 35-42 ◽  
Author(s):  
J. Lacaze ◽  
I. Asenjo ◽  
S. Méndez ◽  
J. Sertucha ◽  
P. Larrañaga ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Ductile Iron ◽  
Iron Castings ◽  
Heavy Section ◽  
Chunky Graphite

Effect of Yttrium-Containing Nodulizer on the Microstructure Formation and Mechanical Properties of Heavy Section Ductile Iron Castings

2010 ◽  
Vol 457 ◽  
pp. 73-78 ◽  
Author(s):  
Qin Xin Ren ◽  
Ming You ◽  
Yun Bang Yao ◽  
Guang Min Wen ◽  
Qi Zhou Cai
Keyword(s):  
Mechanical Properties ◽  
Ductile Iron ◽  
Graphite Nodule ◽  
High Melting ◽  
Microstructure Formation ◽  
High Melting Point ◽  
Iron Castings ◽  
Heavy Section ◽  
Long Time ◽  
Pearlite Content

Ductile iron specimens with dimensions of 400mm×400mm ×450mm were prepared by treating the melt with an yttrium-containing nodulizer. The effect of yttrium on microstructure and mechanical properties was investigated, and the formation of degenerate graphite was discussed as well. The results show that the yttrium-containing nodulizer has good nodulization fading resistance for heavy section ductile iron, since the high melting point hexagonal oxide Y2O3 particles were formed from the nodulizer in the melt and those could act as heterogeneous nuclei for graphite nodule for a long time. Segregation of Ti and MgO at grain boundaries broke the austenite shell, resulting in graphite degeneration. When heavy section ductile iron castings with pearlite matrix were cast, graphite nodule size became finer and the nodularity of graphite nodules improved due to the addition of 0.01wt% Sb to the melt, and pearlite content in specimens increased due to alloying with Cu, Cr, Mo. The heavy section ductile iron tool bed was fabricated by treating the melt with the yttrium-containing nodulizer and Ni. The nodularity of the attached block was 85%~90%, tensile strength, elongation and impact toughness were 440MPa, 23.3% and 5.0J/cm2 respectively.

Microstructure Evolution of Heavy Section Ductile Iron

2010 ◽  
Vol 97-101 ◽  
pp. 1020-1023 ◽  
Author(s):  
Xiao Gang Diao ◽  
Zhi Liang Ning ◽  
Fu Yang Cao ◽  
Shan Zhi Ren ◽  
Jian Fei Sun
Keyword(s):  
Cooling Rate ◽  
Ductile Iron ◽  
Solidification Time ◽  
Cooling Curve ◽  
Eutectic Solidification ◽  
Spheroidal Graphite ◽  
Eutectic Cell ◽  
Cooling Curves ◽  
Iron Castings ◽  
Heavy Section

Ductile iron, Heavy section, Cooling curve, Microstructure, Cooling rate. Abstract. Two 250×250×250 mm cubic ductile iron castings solidified in sand and insulation mould were fabricated. The effect of cooling rate on graphite and matrix microstructure of heavy section ductile iron together with their cooling curves were evaluated. Results show that increasing the cooling rate leads to fine graphitization and favors spheroidal graphite formation. The matrix structure is fully ferrite structure at the edge of both castings, while pearlite can be seen near the eutectic cell boundaries at the center of two castings. Furthermore, the amount of pearlite increases with increasing solidification time. Cooling curves confirm that cooling rate affects solidification time of the eutectic transformation and characteristic temperature points on the cooling curves remain unchanged. Low cooling rate appears to significantly increase the eutectic plateau length. Besides, cooling curves show that eutectic temperature remains constant (about 1160°C), which allows for spheroidal graphite formation. Undercooling and inoculation fading during the long time eutectic solidification lead to pearlite formation in the center of cubic ductile iron castings.

Fatigue Characterization and Optimization of the Production Process of Heavy Section Ductile Iron Castings

2016 ◽  
Vol 11 (1) ◽  
pp. 33-43 ◽  
Author(s):  
E. Foglio ◽  
M. Gelfi ◽  
A. Pola ◽  
S. Goffelli ◽  
D. Lusuardi
Keyword(s):  
Production Process ◽  
Ductile Iron ◽  
Iron Castings ◽  
Heavy Section

Mechanical and Fatigue Properties of Heavy Section Solution Strengthened Ferritic Ductile Iron Castings

2016 ◽  
Vol 18 (12) ◽  
pp. 2070-2075 ◽  
Author(s):  
Thomas Borsato ◽  
Paolo Ferro ◽  
Filippo Berto ◽  
Carlo Carollo
Keyword(s):  
Ductile Iron ◽  
Fatigue Properties ◽  
Iron Castings ◽  
Heavy Section
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