A new type of high chromium cast iron (HCCI) was prepared, and its microstructure, mechanical properties, and abrasion resistance were investigated systematically. Results showed that after surface carburizing and chromizing, the microstructure of HCCI mainly consists of martensite, boride (M2B), and carbide (M7C3), accompanied with a large amount of secondary precipitations M23C6. Moreover, the morphology and hardness of the carbide and boride in HCCI change little, while the volume fraction of carbide and boride increases from 16.23％ to 23.16％. This effectively increases the surface hardness of HCCI from 64.53±0.50 HRC to 66.58±0.50 HRC, with the result that the surface of HCCI possesses a better abrasion resistance compared to the center position. Furthermore, the wear mechanism of HCCI changes from micro-plowing to micro-cutting with the increase of surface hardness.

Peng Chen;Zhao-yang Wu;Yan-liang Yi;Jian-bin Huang;Tao Shang;Wei Li

Institute of Advance Wear&Corrosion Resistant and Functional Materials,Jinan University,Guangzhou 510632,China;Shaoguan Research Institute of Jinan University,Shaoguan 512027,Guangdong,China;Ningxia Tiandi Heavy Equipment Technology Co.,Ltd.,Yinchuan 753001,Ningxia,China

中国铸造

[1]Peng Chen;Zhao-yang Wu;Yan-liang Yi;Jian-bin Huang;Tao Shang;Wei Li-.Effect of surface Cr/C infiltration on microstructure, mechanical properties and wear resistance of high chromium cast iron)[J].中国铸造,2022(03):218-224

chromizing

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