Creep deformation and damage mechanism of compact graphite cast iron with different pearlite contents

Wu Yue; Li Jianping; Chen Hua; Ma Zhijun; Yang Zhong; Guo Yongchun; Liang Minxian

Journal of Materials Research and Technology (Mar 2023)

Creep deformation and damage mechanism of compact graphite cast iron with different pearlite contents

Wu Yue,
Li Jianping,
Chen Hua,
Ma Zhijun,
Yang Zhong,
Guo Yongchun,
Liang Minxian

Affiliations

Wu Yue: Shaanxi Province Engineering Research Centre of Aluminium/Magniesum Light Alloy and Composites, School of Materials and Chemical Engineering, School of Mechatronic Engineering, Xi'an Technological University, Xi'an 710021, China
Li Jianping: Corresponding author.; Shaanxi Province Engineering Research Centre of Aluminium/Magniesum Light Alloy and Composites, School of Materials and Chemical Engineering, School of Mechatronic Engineering, Xi'an Technological University, Xi'an 710021, China
Chen Hua: Corresponding author.; Shaanxi Province Engineering Research Centre of Aluminium/Magniesum Light Alloy and Composites, School of Materials and Chemical Engineering, School of Mechatronic Engineering, Xi'an Technological University, Xi'an 710021, China
Ma Zhijun: Shaanxi Province Engineering Research Centre of Aluminium/Magniesum Light Alloy and Composites, School of Materials and Chemical Engineering, School of Mechatronic Engineering, Xi'an Technological University, Xi'an 710021, China
Yang Zhong: Shaanxi Province Engineering Research Centre of Aluminium/Magniesum Light Alloy and Composites, School of Materials and Chemical Engineering, School of Mechatronic Engineering, Xi'an Technological University, Xi'an 710021, China
Guo Yongchun: Shaanxi Province Engineering Research Centre of Aluminium/Magniesum Light Alloy and Composites, School of Materials and Chemical Engineering, School of Mechatronic Engineering, Xi'an Technological University, Xi'an 710021, China
Liang Minxian: Shaanxi Province Engineering Research Centre of Aluminium/Magniesum Light Alloy and Composites, School of Materials and Chemical Engineering, School of Mechatronic Engineering, Xi'an Technological University, Xi'an 710021, China

Journal volume & issue: Vol. 23
pp. 5031 – 5039

Abstract

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The creep deformation and damage mechanism of compacted graphite cast iron (CGI) with varying pearlite contents were studied at 450 °C, 500 °C, and 550 °C, with accompanying stress ranges from 40 MPa to 150 MPa. The creep deformation of CGI alloys presents obvious when the temperature exceeds 450 °C. The creep rate exponentially decreases with pearlite contents and the creep mechanism changes from dislocation slip to grain boundary sliding. There are (Ⅰ) intergranular and transgranular cracks, (Ⅱ) interfacial debonding between graphite and matrix, and (Ⅲ) pearlite morphologic transforming in the microstructure of CGI during the creep test. (Ⅰ) and (Ⅱ) are mainly caused by the creep stress and temperature, and (Ⅲ) may be related to plastic deformation. These cracks can interact with each other and accelerate the failure and fracture of materials.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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