热处理对含钨高铬铸铁组织及性能的影响  

Effects of heat treatment on microstructure and properties of high chromium tungsten-containing cast iron

作　　者：孙玉福[1] 于广文[1] 赵靖宇[1] 李志明[2] 时爱菊[1] 刘晓芳[1] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450002 [2]郑州机械研究所,河南郑州450001

出　　处：《金属热处理》2008年第9期91-94,共4页Heat Treatment of Metals

摘　　要：采用金相显微镜、扫描电镜观察微观组织，X射线衍射仪分析相组成，并测定洛氏硬度、冲击韧性及耐磨性，研究了热处理对含钨高铬铸铁组织及性能的影响。结果表明，钨在高铬铸铁基体和碳化物中均匀分布，热处理对钨的分布影响不大，钨能显著提高高铬铸铁的性能。含钨高铬铸铁合理热处理工艺是1050℃奥氏体化淬火，250～350℃回火，在该热处理条件下的组织为马氏体＋碳化物＋少量残留奥氏体，铬的碳化物类型为Cr7C3、Cr23C6，钨的碳化物有WC1-x、W6C2.54、W3C，硬度为62～63HRC，冲击韧度为7～8J／cm^2，耐磨性比不含钨高铬铸铁显著提高。The effects of heat treatment on microstructure and properties of high chromium tungsten-containing cast iron were studied with metalloscope, SEM, X-ray diffraction and measurement of Rockwell hardness, impact toughness and wearability. The results show that the distribution of W is uniform in matrix of high chromium cast iron and carbides. The heat treatment hardly has any effect on the distribution of tungsten. The properties of high chromium cast iron increase obviously with tungsten addition. The proper heat treatment for high chromium tungsten-containing cast iron is tempering at 250 -350℃ after quenching at 1050℃. Under this condition,the microstructure of the cast iron consists of martensite,carbides and a small amount of retaimned austenite. The carbide kinds of Cr and W are Cr7C3 、Cr23C6 and WC1-x, W6 C2.54, W3 C, respectively. The hardness is 62 - 63 HRC and impact toughness is 7 ～ 8 J/cm2. The abrasion resistance is better than that of high chromium cast iron without tungsten containing.

关 键 词：钨 高铬铸铁 热处理 组织 性能 

分 类 号：TG163[金属学及工艺—热处理] TG142.1[金属学及工艺—金属学]