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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Obtaining Martensitic Structures during Thixoforming of Hypoeutectic Gray Cast Iron

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Author(s):
Ragazzo, Lucas Bertolino [1] ; Benati, Davi Munhoz [1] ; Lopez Nadal, Rodolfo [2] ; Zoqui, Eugenio Jose [1]
Total Authors: 4
Affiliation:
[1] Univ Estadual Campinas, Dept Mat & Mfg Engn, Fac Mech Engn, BR-13083860 Campinas, SP - Brazil
[2] Univ Oriente, Fac Mech Engn, Dept Mat & Mfg, Santiago De Cuba 90400 - Cuba
Total Affiliations: 2
Document type: Journal article
Source: ADVANCES IN MATERIALS SCIENCE AND ENGINEERING; 2015.
Web of Science Citations: 0
Abstract

The control of parameters such as liquid fraction, holding time, and cooling rate during thixoforming can help control the final microstructure of the thixoformed part, thus improving its mechanical properties. This study intended to investigate conditions required to obtain martensite in hypoeutectic gray cast iron at 3.1% CE (carbon equivalent) deformed in the semisolid state. Samples heated up to 1130, 1135, and 1145 degrees C (liquid fractions of 10, 30, and 45%) were compressed into platens without any holding time (0s). If a sample presented a martensitic structure for 0 s holding time, new samples were retested at the same temperature for 30, 60, and 90 s holding times. The die casting process was simulated by allowing the platens to become locked after hot compression. Samples that cooled in the locked platens were submitted to higher cooling rates than samples that cooled with the platens open and presented martensite instead of the conventional ferrite and pearlite. Thus, the factor that had the greatest influence on the formation of martensite was the cooling rate rather than stress. The thixoforming process presented good morphological stability, which is highly desirable for industrial applications. (AU)

FAPESP's process: 11/19997-0 - Effect of chromium in the thixoformability of hipoeutetic cast iron
Grantee:Davi Munhoz Benati
Support type: Scholarships in Brazil - Doctorate