Effects of Heat Treatment on Microstructure and Wear Resistance of Cr20 High Chromium Cast Iron Used for Straw Extruder Screw
Author of the article:LI Guocheng;CHEN Xin;JIANG Jinzhe;LIU Yue
Author's Workplace：Liaoning Xianghe Husbandry Co.,Ltd.,Fuxin 123000,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China
Key Words：high chromium cast iron heat treatment microstructure hardness toughness wear resistance
Abstract：The effects of quenching and tempering temperature on the microstructure,hardness,toughness and wear resistance of Cr20 high chromium cast iron were studied by means of optical microscope,scanning electron microscope,X-ray diffraction instrument,hardness tester and abrasive wear testing machine.The results show that Cr20 has the highest wear resistance compared with Cr15 and Cr26 because of the high content of secondary carbide and martensite after quenching at 990℃×1 h,combined with primary tempering at 250℃×1 h and secondary tempering at 400℃×1 h(Air cooling).
