摘要
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(M_(2)B),and carbide(M_(7)C_(3)),accompanied with a large amount of secondary precipitations M_(23)C_(6).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.
基金
the National Key Research and Development Project of China(No.2017YFB0305100)
the Science and Technology Project of Guangdong Province(No.2017B090903005)
the National Natural Science Foundation of China(No.52005217)
the Science and Technology Project of Guangzhou City(No.201806040006)
the Basic and Applied Basic Research Fund Project of Guangdong Province(Nos.2021A1515010523 and 2020A1515110020)
the Fundamental Scientific Research Business Expenses of Central Universities(No.21620344).
