高镍奥氏体铸铁的组织和电化学性能研究
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摘要
采用拜耳法赤泥电碳热还原的合金,参照牌号QTANi35Si5Cr2,制备了排气歧管高镍奥氏体铸铁。利用光学显微镜、扫描电子显微镜、电化学工作站腐蚀试样的方法,对比硅钼铸铁QTRSi4Mo1,研究了排气歧管用高镍铸铁ATNi35Si5Cr2的微观组织及电化学腐蚀性能。结果表明,高镍奥氏体铸铁的组织由奥氏体树枝晶+石墨+晶间碳化物组成,碳化物在晶界以及晶体上均匀分布。镍和硅均匀分布于奥氏体晶体中,铬和锰主要偏聚于晶界处。加入的元素,提高了奥氏体的耐腐蚀性能。QTRSi4Mo1为球状石墨,基体组织为铁素体和少量层片状珠光体。QTRSi4Mo1的腐蚀电位相对较低,阻抗圆弧更小,相对于高镍奥氏体铸铁,在耐腐蚀性能上明显存在不足。
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.
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.
引文
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[2]何雪松,左鹏鹏,吴晓春,等.Ni对新型压铸模具钢连续冷却转变规律的影响[J].材料热处理学报,2015(10):134-140.
[3]张鑫,李伟,田雨苗,等.耐热铸造合金材料在汽车排气歧管上的应用[J].现代铸铁,2014,34(1):62-66.
[4]房敏,吴小雄,程圣洋,等.高镍奥氏体球铁排气管的生产[J].中国铸造装备与技术,2016(1):24-28.
[5]李党育,李新田,田书涛,等.一种奥氏体耐热铸钢排气歧管及其铸造工艺[P].中国,CN201410072390.3,2014-02-28.
[6]黄志光,肖理明,陈平昌,等.在900℃工作的Ni25奥氏体球墨铸铁高温性能的改善[J].现代技术,1992(1):3-6.
[7]于海侠,杨云龙,曹占义,等.汽车排气歧管用耐热球墨铸铁的抗氧化性研究[J].热加工工艺,2014,43(8):43-45,49.
[8]何奥平,曾晓乐,曾建民,等.拜耳法赤泥碳热还原制备铁合金[J].机械工程材料,2016(5):47-51,56.
[9]Lena Magnusson Aberg,Cathrine Hartung.Solidification of Si Mo Nodular Cast Iron for High Temperature Applications[J].Trans Indian Inst Met,2012(12):633-636
[10]Havva Kazdal Zeytin,Ceylan Kubilay,Huseyin Aydin,et al.Effect of Microstructure on Exhaust Manifold Cracks Produced From Si Mo Ductile Iron[J].Journal of iron and steel research,international,2009,3(16):32-36.
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