含碳量及热处理工艺对高铬铸铁组织与耐磨性的影响  

Effects of carbon content and heat treatment process on microstructure and wear resistance of high chromium cast iron

作　　者：王玉江 宋百隆 魏世丞 盛忠起[2] 张平[3] 黄玉炜 黄威 

机构地区：[1]陆军装甲兵学院装备再制造技术国防科技重点实验室,北京100072 [2]东北大学机械工程与自动化学院,辽宁沈阳110819 [3]陆军装甲兵学院机械产品再制造国家工程研究中心,北京100072

出　　处：《金属热处理》2018年第2期30-34,共5页Heat Treatment of Metals

基　　金：国家自然科学基金(51675533,57103218);中国工程院咨询研究项目(2017-XY-37)

摘　　要：采用光学显微镜和扫描电镜分析高铬铸铁显微组织的变化,采用XRD分析物相组成,采用MLG-130B型干砂橡胶轮磨损试验机进行磨损试验,研究了不同碳含量和热处理工艺对高铬铸铁组织及耐磨性能的影响。研究结果表明,碳含量主要影响初生碳化物形貌及分布状态,热处理工艺对高铬铸铁组织及性能影响显著。随含C量升高,初生碳化物由均匀分布于基体中的短棒状和细杆状转变为呈连续网状分布于基体中的六角块状和长条状。经980℃×4 h风冷淬火处理后,基体组织由奥氏体转变为马氏体,碳化物由M_3C型转化为M_7C_3型,试样的硬度和耐磨性均较铸态时显著提升。由于含C量为4.5%试样中碳化物割裂基体,导致其耐磨性能较同样处理条件下的含C量为2.5%的试样差。Effects of carbon content and heat treatment process on microstructure and wear resistance of high chromium cast iron were analysedwith optical microscopy, scanning electron microscopy, X-ray diffraction and MLG-130B impact abrasive wear testing machine. The resultsshow that the carbon content mainly ＇affects the morphology and distribution of primary carbides, and the heat treatment process has a signific, aninfluence on the microstructure and properties of the high chromium cast iron. With the increase of carbon content, the prmiary carbidetransformed from the short rod-like and thin rod-like shape which distributed unifornrly in the matrix to six angular and long strips whichdistributed continuously in the matrix. After heat treatment at 980 ℃ for 4 h, the matrix microstructure transformed from austenite tomartensite, the carbides in high chromium cast iron samples changed from M3 C to M7C3 , a lot of secondary carbides dispersively precipitated,which leads to a significantly improvement in hardness and were＂ resistance of the samples than those of the unheated ones. The carbides in theC-4.5% samples separate the matrix which makes its wear resistance be worse than that of C-2.5% samples in the same condition.

关 键 词：高铬铸铁 碳含量 热处理 显微组织 耐磨性 

分 类 号：TG156.88[金属学及工艺—热处理]