Effect of austenitizing temperature on the microstructure evolution and properties of Cu-bearing CADI

Rong Nan; Hanguang Fu; Penghui Yang; Jian Lin; Yongping Lei

doi:10.3139/120.111394

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Effect of austenitizing temperature on the microstructure evolution and properties of Cu-bearing CADI

Rong Nan , Hanguang Fu , Penghui Yang , Jian Lin und Yongping Lei

Veröffentlicht/Copyright: 30. August 2019

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Abstract

In the present study, the authors investigated the effect of the austenitizing temperature (860 to 1020 °C) on the microstructure evolution, hardness, wear resistance and corrosion resistance of Cu-bearing carbidic austempered ductile iron (CADI) by means of an optical microscope (OM), a scanning electron microscope (SEM), a Rockwell hardness tester, a microhardness tester, an X-ray diffractometer (XRD), a block-on-ring wear testing machine and electrochemical tester. The results show that with an increase in the austenitizing temperature, the amount of acicular ferrite decreases, size expands, and the volume fraction of high-carbon austenite increases gradually as does carbon content. Part of the carbide dissolves into the matrix, and the amount is significantly reduced. The hardness of Cu-bearing CADI first increases and subsequently decreases, and the hardness is highest at 940 °C. With an increase in austenitizing temperature, the wear loss of Cu-bearing decreases and its wear resistance increases. When the austenitizing temperature is 940 °C, wear loss is lowest and wear resistance is optimal. Electrochemical corrosion experiments show that as the austenitizing temperature increases, the corrosion potential of Cu-bearing CADI is slightly improved, the corrosion current density is gradually reduced, and the corrosion resistance of Cu-bearing CADI is improved. Considered comprehensively, the austenitizing temperature of Cu-bearing CADI should be determined to be 940 °C.

∗Correspondence Address, Prof. Dr. Hanguang Fu, School of Materials Science and Engineering, Beijing University of Technology, Number 100, Pingle Garden, Chaoyang District, Beijing 100124, P. R. China, E-mail: hgfu@bjut.edu.cn

Rong Nan, born in 1992, is a Master's candidate at the Beijing University of Technology, China. He obtained his Bachelor's degree at the School of Materials Science and Engineering at Chang'sn University, Xi‘an, China in 2017. His research interests mainly focus on wear-resistant alloy materials.

Prof. Dr. Hanguang Fu, born in 1964, is a Professor at the Beijing University of Technology, China. He obtained his PhD at the School of Materials Science and Engineering at Xi'sn Jiaotong University, Xi‘an, China, in 2004. His research interests mainly focus on solidification control. He has published over 240 technical papers and holds more than 120 invention patents in China.

Penghui Yang, born in 1992, is a Doctoral candidate at the Beijing University of Technology, China. He obtained his Master's degree at the School of Materials Science and Engineering at Jiamusi University, Jiamusi, China, in 2017. His research interests mainly focus on wear-resistant alloy materials.

Dr. Jian Lin, born in 1979, is an Associate Professor at the Beijing University of Technology, P. R. China. He obtained his PhD at the Department of Mechanical Engineering, Tsinghua University, Beijing, China, in 2006. His research interests mainly focus on the joining method of steel to aluminum and welding residual stress analysis. He has published over 50 technical papers.

Prof. Dr. Yongping Lei, born in 1957, is a Professor at the Beijing University of Technology, China. He obtained his PhD at the School of Materials Science and Engineering at Xi'sn Jiaotong University, Xi'sn, China, in 1994. His research interests mainly focus on the development of lead-free solder paste, the reliability of solder joints and welding. He has published over 120 technical papers and holds more than 80 invention patents in China.

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Published Online: 2019-08-30

Published in Print: 2019-08-30

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