铸造技术2018，Vol.39Issue(6)：1161-1164,1176,5.DOI:10.16410/j.issn1000-8365.2018.06.004
高镍奥氏体铸铁的组织和电化学性能研究
Study of Microstructure and Electrochemical Performance of High Nickel Austenitic Cast Iron
摘要
Abstract
The high Nickel austenitic cast iron of the exhaust manifold was prepared by using the alloy with the bayer red mud electrothermal carbon thermal reduction and the classification of QTANi35 Si5 Cr2.The microstructure and electrochemical corrosion property of high Nickel iron ATNi35 Si5 Cr2 used for exhaust manifold and the reference silicon molybdenum iron QTRSi4 Mo1 were investigated by optical, SEM, electrochemical workstation corrosion pattern.The results show that the microstructure of high nickel austenitic cast iron is consisted of austenitic dendritic crystal, graphite and carbides at crystal boundaries, the carbides is evenly distributed in the crystals as well as the boundaries.Nickel and silicon are evenly distributed in austenite crystals, and chromium and manganese are mainly clustered in the crystal boundaries.The corrosion resistance of austenite is greatly improved by adding the elements.The QTRSi4 Mo1 is spherical graphite, and the substrate is composed of ferrite and a small number of laminated pearlite.The corrosion potential of QTRSi4 Mo1 is relatively low and the impedance arc is smaller, its corrosion resistance property is significantly lower than that of ATNi35 Si5 Cr2.关键词
排气歧管/高镍铸铁/显微组织/电化学腐蚀Key words
exhaust manifold/high nickel cast iron/microstructure/electrochemical corrosion分类
矿业与冶金引用本文复制引用
谭自盟,王嘉诚,何奥平,曾建民,甘永中,陈世俊..高镍奥氏体铸铁的组织和电化学性能研究[J].铸造技术,2018,39(6):1161-1164,1176,5.基金项目
广西壮族自治区教育厅资助项目"广西生态型铝产业协同创新中心"(XTCX002) （XTCX002）
广西自治区"铝合金材料先进加工技术"八桂学者专项经费(2013A002) （2013A002）
