Effect of surface Cr/C infiltration on microstructure,mechanical properties and wear resistance of high chromium cast iron  

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

机构地区：[1]Institute of Advance Wear&Corrosion Resistant and Functional Materials,Jinan University,Guangzhou 510632,China [2]Shaoguan Research Institute of Jinan University,Shaoguan 512027,Guangdong,China [3]Ningxia Tiandi Heavy Equipment Technology Co.,Ltd.,Yinchuan 753001,Ningxia,China

出　　处：《China Foundry》2022年第3期218-224,共7页中国铸造（英文版）

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).

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.

关 键 词：high chromium cast iron carburizing and chromizing mechanical property abrasion resistance 

分 类 号：TG143.9[一般工业技术—材料科学与工程]