Obtaining martensitic structures during thixoforming of hypoeutectic gray cast iron
ARTIGO
Inglês
Agradecimentos: The authors would like to thank Grant 2011/19997-0 from Sao Paulo Research Foundation (FAPESP), National Council ˜ for Scientific and Technological Development (CNPq), and Grant 095/2010 from Coordination for the Improvement of Higher Education Personnel (CAPES) for financial support...
Agradecimentos: The authors would like to thank Grant 2011/19997-0 from Sao Paulo Research Foundation (FAPESP), National Council ˜ for Scientific and Technological Development (CNPq), and Grant 095/2010 from Coordination for the Improvement of Higher Education Personnel (CAPES) for financial support and Faculty of Mechanical Engineering, State University of Campinas, for providing the necessary infrastructure
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...
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°C (liquid fractions of 10, 30, and 45%) were compressed into platens without any holding time (0 s). 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
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2011/19997-0
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
Aberto
DOI: https://doi.org/10.1155/2015/170562
Texto completo: https://www.hindawi.com/journals/amse/2015/170562/
Obtaining martensitic structures during thixoforming of hypoeutectic gray cast iron
Obtaining martensitic structures during thixoforming of hypoeutectic gray cast iron
Fontes
Advances in materials science and engineering Vol. 2015 (Aug., 2015), p. 1-7, n. art. 170562 |