水平连铸高镍铸铁棒材的微观组织与性能
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摘要
采用水平连铸工艺制备了直径为54mm的高镍铸铁棒材,研究了棒材截面不同位置的微观组织形成机制和力学性能。结果表明,从棒材边缘向内3/5半径处范围内的组织(棒材外部)为D型石墨区,奥氏体晶粒呈树枝状,晶粒细小,一次枝晶发达,二次枝晶短小。棒材的3/5半径处到棒材轴心范围内的组织(棒材心部)为D型石墨+少量的E型石墨混合区,奥氏体晶粒呈树枝状,晶粒粗大,部分晶粒的二次枝晶较为发达。棒材中含有1.0%~1.3%的合金碳化物。高镍铸铁棒材的抗拉强度为247~273 MPa,硬度(HB)为142~152。
High nickel cast iron rods with 54 mm in diameter were produced by horizontal continuous casting.The formation mechanism of microstructure and mechanical properties of the cast iron at varied locations were investigated.The results show that the graphite in high nickel cast iron rods from the edge to the 3R/5is D-type graphite zone,and morphology of austenite grain exhibits the developed fine dendrite.The graphite in high nickel cast iron rods from the 3R/5to the axis are D-type graphite and a small amount of the E-type graphite.Morphology of austenite grain is coarse dendrite.There exists a little carbide about 1.0%~1.3%in the bar.Tensile strength and hardness of the high nickel cast iron rods reach 247 ~ 273 MPa and 142to152 HB,respectively.
High nickel cast iron rods with 54 mm in diameter were produced by horizontal continuous casting.The formation mechanism of microstructure and mechanical properties of the cast iron at varied locations were investigated.The results show that the graphite in high nickel cast iron rods from the edge to the 3R/5is D-type graphite zone,and morphology of austenite grain exhibits the developed fine dendrite.The graphite in high nickel cast iron rods from the 3R/5to the axis are D-type graphite and a small amount of the E-type graphite.Morphology of austenite grain is coarse dendrite.There exists a little carbide about 1.0%~1.3%in the bar.Tensile strength and hardness of the high nickel cast iron rods reach 247 ~ 273 MPa and 142to152 HB,respectively.
引文
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[2]YOU B S,YIM C D,KIM S H.Solidification of AZ31magnesium alloy plate in a horizontal continuous casting process[J].Materials Science and Engineering,2005,A413:139-143.
[3]YANG S F,ZHANG L F,LI J S,et al.Structure optimization of horizontal continuous casting tundishes using mathematical modeling and water modeling[J].ISIJ International,2009,49(10):1 551-1 560.
[4]YAN Z M,LI X T,CAO Z Q,et al.Grain refinement of horizontal continuous casting of the CuNi10Fe1Mn alloy hollow billets by rotating magnetic field(RMF)[J].Materials Letters,2008,62(28):4 389-4 392.
[5]FATAHALLA N,ABUELEZZ A,SEMEIDA M.C,Si and Ni as alloying elements to vary carbon equivalent of austenitic ductile cast iron:microstructure and mechanical properties[J].Materials Science and Engineering,2009,A504(1):81-89.
[6]赵新武,张居卿.高Ni奥氏体球墨铸铁的生产[J].现代铸铁,2011,31(A2):28-35.
[7]金永锡,范仲嘉.高镍奥氏体球墨铸铁涡轮增压器壳体材质及工艺研究[J].铸造,2005,54(5):494-500.
[8]高顺,程凤军,史朝龙,等.高镍奥氏体球墨铸铁涡壳的开发[J].铸造,2013,62(4):287-291.
[9]NAGODE M,LNGLER F,HACK M.A time-dependent damage operator approach to thermo-mechanical fatigue of Ni-resist D-5S[J].International Journal of Fatigue,2011,33(5):692-699.
[10]JIANG K,QU Y D,YOU J H,et al.Influence of Cr element on impact fracture process of ductile Ni-resistant alloyed iron at low temperature[J].China Foundry,2016,13(1):42-46.
[11]RASHIDI M M,IDRIS M H.Effect of inoculation on microstructure,mechanical and corrosion properties of high manganese ductile Ni-resist alloy[J].Materials&Design,2013,51:861-869.
[12]GB/T 15749-2008.定量金相测定方法[S].
[13]沈保罗,李莉,岳昌林,等.高强度D型石墨铸铁的研究进展[J].现代铸铁,2006,26(6):49-54.
[14]邱复兴.D型石墨和E型石墨形成机理探讨[J].内燃机配件,1989(1):13-17.
[15]崔忠圻,覃耀春.金属学与热处理[M].北京:机械工业出版社,2007.
[16]范晓明,贾去福,余小华.D型石墨铸铁的凝固特性、结晶和组织的研究[J].武汉工学院学报,1990,12(3):11-16.
[17]贺润?,夏青,何彦永.灰铸铁拉伸断口的微观形貌及断裂机理探讨[J].现代铸铁,1985(3):15-22.