镍基高温合金K4169中夹杂物的特征及形成机理

发布时间：2018-03-06 23:24

本文选题：真空感应熔炼　切入点：镍基高温合金　出处：《中国有色金属学报》2015年09期 　论文类型：期刊论文

【摘要】：采用真空感应熔炼法冶炼出镍基合金K4169,通过电解萃取结合原位SEM分析法研究夹杂物的物相组成、尺寸形貌及成分,并分析夹杂物的分布、来源及形成机理。结果表明:K4169合金中的单相夹杂物主要为氧化物、碳化物和氮化物(以TiN、Al2O3、SiO2、TiO2、SiC等为主),复合夹杂物主要有硅铝酸盐(Al2O3-SiO2、Al2O3-MgO)、钛的碳、氮、氧化物(TiC-TiN、TiC-TiO2-TiN)及金属复合氧化物夹杂物(Mo-Ni-Fe-O、Ni-Nb-O)。TiN多分布在Laves相周围;SiC多分布在棒材边缘;其余各类氧化物多见于棒材心部缩孔内部及周围。硅铝酸盐复合夹杂物由硅铝氧化物的单相夹杂碰撞形成;金属复合氧化物夹杂于凝固后期的偏析液中氧化析出;碳氮化物复合夹杂物的形成机理有两类:一类为自发形核(TiC-TiN、TiC-TiO2-TiN),另一类为以MgO-Al2O3为核心异质形核(TiN)。
[Abstract]:The nickel base alloy K4169 was smelted by vacuum induction melting. The phase composition, size, morphology and composition of the inclusions were studied by electrolysis extraction and in situ SEM analysis, and the distribution of the inclusions was analyzed. The results show that the single phase inclusions in WK4169 alloy are mainly oxides, carbides and nitrides (such as TiNU Al _ 2O _ 3, Sio _ 2o _ 2o _ 2o _ 2o _ 2 sic, etc.). The composite inclusions mainly consist of aluminosilicate Al _ 2O _ 3-SiO _ 2o _ 3Al _ 2O _ 3-MgO _ (3), titanium carbon, nitrogen, etc. Oxide TiC-TiO2-TiN) and metal complex oxide inclusions Mo-Ni-Fe-ONb-OU. Tin mostly distributed around the Laves phase in the edge of the bar. The other kinds of oxides are mainly found in and around the shrinkage holes in the core of bars. The aluminosilicate composite inclusions are formed by the single phase inclusion collision of the silica-aluminum oxides, and the metal composite oxides are oxidized and precipitated in the segregation solution of the late solidification period. The formation mechanism of carbonitride complex inclusions can be divided into two categories: one is spontaneous nucleation TiC-TiO2-TiN, the other is the heterogeneous nucleation with MgO-Al2O3 as the core.
【作者单位】：兰州理工大学材料科学与工程学院;兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室;
【基金】：国家重点基础研究发展计划项目(2012CB722806) 国家自然科学基金资助项目(51461029) 兰州理工大学江柳青年基金项目(Q2012203)
【分类号】：TG132.3

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