摘要
对Φ150mm CADI磨球分别用盐浴等温淬火、油淬等温淬火和水-空交替等温淬火三种等温淬火工艺进行热处理,测定了热处理后磨球的洛氏硬度和冲击吸收能量,使用X射线衍射仪(XRD)、光学显微镜(OM)和扫描电镜(SEM)对大直径磨球内部不同部位的物相和微观组织进行表征。试验结果表明:三种热处理后的大直径CADI磨球的微观组织十分相似,均由针状铁素体、富碳奥氏体、碳化物和球状石墨组成。经过盐浴等温淬火热处理后,磨球心部到表面的洛氏硬度在HRC53.37~57范围内,心部和1/2半径(1/2R)处冲击吸收能量分别为11.98 J、13.78 J;经过油淬等温淬火热处理后,磨球心部到表面的洛氏硬度在HRC51.95~55.20范围内,心部和1/2R处冲击吸收能量分别为12.28 J、14.8 J;经过水-空交替等温淬火热处理后,磨球心部到表面的洛氏硬度在HRC52.73~55.75范围内,心部和1/2R处冲击吸收能量分别为12.7 J、13.78 J。经过水-空交替等温淬火处理后的大直径CADI磨球的组织和力学性能与盐浴和油淬工艺相近,磨球内外性能差异小。水-空交替等温淬火工艺有望替代盐浴和油淬等温淬火工艺。
In this study,the Φ150 mm CADI grinding ballswereheat-treated by three austempering processes:salt bath austempering,oil quenching austempering and water-air alternating austempering.The Rockwell hardness and impact absorption work of the grinding balls after heat treatment weremeasured.The phase constituentswereanalyzed byXRD,and the microstructure wasobserved by OM and SEMfor different zones of the large diameter grinding balls.The test results show that the three heat-treated large-diameter CADI grinding balls have a extremely similar microstructure,which is composed of acicular ferrite,carbon-rich austenite,carbides and spheroidal graphite.After the salt bath austempering heat treatment,the Rockwell hardness from the center to the surface of the grinding ball is in the range of HRC 53.37 to 57,and the impact absorption energy at the center and 1/2R are 11.98 J,13.78 J,respectively;after oilquenching austempering heat treatment,the Rockwell hardness from the center to the surface of the grinding ball is in the range of HRC 51.95 to 55.20,and the impact absorption energy at the center and 1/2R are 12.28 J,14.8 J,respectively,after water-air alternatingaustempering heat treatment,the Rockwell hardness from the center to the surface of the grinding ball is in the range of HRC 52.73to 55.75,and the impact absorption energy at the center and 1/2R are 12.7 J,13.78 J,respectively.The microstructure and performance of the large-diameter CADI grinding ball after the water-air alternating austempering treatment are similar to those of the salt bath and oil quenching process,and the difference in the inner and outer properties of the grinding ball is small.The water-air alternating austempering process is expected to replace the salt bath and oil quenching austempering process.
作者
钟兆栋
陈灿光
桂劲松
姚永茂
涂小慧
李卫
ZHONG Zhao-dong;CHEN Can-guang;GUI Jing-song;YAO Yong-mao;TU Xiao-hui;LI Wei(Institute of Advanced Wear&Corrosion Resistant and Functional Materials,Jinan University,Guangzhou 510632,Guangdong,China;NingguoHuafeng Wear-Resistant Material Co.,Ltd.,Ningguo 242300,Anhui,China;National Joint Engineering Research Center of High Performance Metal Wear Resistant Materials Technology,Jinan University,Guangzhou 510632,Guangdong,China)
出处
《铸造》
CAS
北大核心
2021年第4期409-414,共6页
Foundry
基金
国家重点研发计划(2017YFB0305100)。
关键词
CADI磨球
盐浴等温淬火
油淬等温淬火
水-空交替等温淬火
CADI grinding ball
salt bath austempering
oil quenching austempering
water-air alternating austempering
