摘要
采用工艺简单且界面结合良好的负压条件下双液金属成型技术制备了高铬铸铁/低碳钢复合材料,利用光学显微镜、扫描电镜、能谱仪和硬度计等研究了高铬铸铁/低碳钢复合界面的组织和不同温度淬火对高铬铸铁组织性能的影响。结果表明:通过负压条件下双液双金属复合成型技术制备的复合材料的界面结合良好,两侧合金元素和显微硬度呈梯度分布,无混料、孔洞和结合不良等情况;从高铬铸铁侧至低碳钢侧的铸态组织依次为珠光体+(Fe,Cr)_(7)C_(3)、珠光体、铁素体+珠光体,界面复合层的显微硬度为200~214 HV0.5,介于高铬铸铁和低碳钢之间,界面两侧元素呈梯度分布;950℃淬火后,高铬铸铁硬度最高,其组织主要由长条状M_(7)C_(3)碳化物、马氏体基体和细小点状碳化物组成。
Under negative pressure conditions,high chromium cast iron/low carbon steel composites were prepared using double liquid metal molding technology,which has the advantages of simple process and good interface bonding.Microstructure of the high chromium cast iron/low carbon steel composite interface and the effect of quenching at different temperatures on microstructure and properties of high chromium cast iron were studied using optical microscope,scanning electron microscopy,energy dispersive spectrometer analysis,and hardness tester.The results show that the interface bonding of the composites prepared by the double liquid bimetallic composite molding technology under negative pressure conditions is good,with gradient distribution of alloy elements and microhardness on both sides,and no mixing,pores,or poor bonding.The as cast microstructure from high chromium cast iron side to low carbon steel side is pearlite+(Fe,Cr)_(7)C_(3),pearlite,ferrite+pearlite,and the microhardness of the interface composite layer is 200-214 HV0.5,which is between high chromium cast iron and low carbon steel.The elements on both sides of the interface are distributed in a gradient.After quenching at 950℃,the high chromium cast iron has the highest hardness,and its microstructure is mainly composed of elongated M_(7)C_(3)carbides,martensitic matrix,and small point-like carbides.
作者
刘新成
杨鹏辉
张雨佶
杨锦龙
刘元龙
王梦琪
LIU Xin-cheng;YANG Peng-hui;ZHANG Yu-ji;YANG Jin-long;LIU Yuan-long;WANG Meng-qi(Jiayu Lianzhong Machinery Equipment Co Ltd,Jiayuguan 735100,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《材料热处理学报》
北大核心
2025年第8期12-19,共8页
Transactions of Materials and Heat Treatment
基金
嘉峪关市重点研发计划项目(23-13)
甘肃省科技计划项目(23JRRA810)。
关键词
双金属
复合界面
高铬铸铁
显微组织
碳化物
bimetal
composite interface
high chromium cast iron
microstructure
carbide
