球铁马氏体彩色金相的制备及研究.pdfVIP

学兔兔 Apr．2010 · 388· VoI．59 No．4 球铁马氏体彩色金相的制备及研究 梅 瑛，胡在矶 (中原工学院机电学院，河南郑州450007) 摘要：球铁铸态试样与热处理态试样的彩色金相制备工艺规范不同。分析了热处理态试样难于成色的原因，并试验得 出热处理态彩色金相制备工艺规范。通过彩色金相图对马氏体球铁磨球的结晶形态和晶内缺陷进行了深入讨论。结果 表明，彩色金相比黑白金相能揭示更多的马氏体结构特征信息，并为保证获得力学性能良好的球铁提供依据。 关键词：球铁；热处理态；马氏体孪晶亚结构；残余奥氏体 中图分类号：TG1 15．21 1-3 文献标识码：A 文章编号：1001—4977(2010)04—0388—04 Preparation and Study of Color Metallograph of Martensite in DUclIle Iron MEI Ying，HU Zai-ji (Department of Mechanical and Electronics，Zhongyuan Institute of Technology Zhengzhou 450007，He’nan，China) Abstract：The preparation standards of the as cast and heat—treated samples of ductile iron are different．The di仟iculties of coloring the heat．treated samples were analyzed and the preparation standard of the ductile iron’S color metallograph under the heat—treated state was obtained by the experiments．By the using of color metallograph．the crystaf morphology and intracrystalline defects of the martensite ductile iron bal1 were deeply discussed．The results show that the color metallograph can provide more structuraI Information of the martensite than monochrome metallograph and can offer the criterion to ensure the good mechanicaI properties of the ductile Iron． Key words：ductile iron；heat—treated state；metastructure of twin martensite；residual austenite 球铁铸态试样的彩色金相制备可以按 《铸铁彩色 0．6％，75％硅铁作孕育剂。磨球凝固后冷却至88 金相等 中的工艺规范进行[1]，笔者经多次试验研究发 900℃ (光学显微镜测定)水淬；再加热至200~220℃ 现，球铁热处理态