复合盐净化剂对GH4169返回料成分和组织的影响  

Effects of Compound Salt Purifiers on Composition and Microstructure of GH4169 Returned Alloy

作　　者：蒲永亮[1] 寇生中[1,2] 张志栋[1] 曲红霞[1] 罗文涛[1] 郭晓凡[1] 董天文[1] PU Yong-liang;KOU Sheng-zhong;ZHANG Zhi-dong;QU Hong-xia;LUO Wen-tao;GUO Xiao-fan;DONG Tian-wen(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;Key Laboratory of Non-ferrous Metal Alloys and Processing of the Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China)

机构地区：[1]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,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《有色金属（冶炼部分）》2018年第7期57-61,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家重点基础研究发展计划项目(2012CB722800)

摘　　要：选用12种配方的复合盐净化处理高温合金GH4169返回料,采用不同手段分析净化后返回料合金的主要元素和氧氮含量、夹杂相的组成及形貌尺寸,研究了复合盐净化处理对GH4169返回料成分和组织的影响。研究发现,复合盐80%B_2O_3+20%Na_2B_4O_7和50%CaF_2+45%AlF_3+5%CaO+微量(Al2O3+MgO)能够有效降低GH4169返回料中的氧、氮含量。经这两种复合盐净化处理后,返回料合金的主要元素含量没有明显变化,而氧含量分别降低了82.10%和96.21%、氮含量分别降低了69.10%和14.55%,均能达到新料合金对氧、氮含量的要求。复合盐能有效吸附去除GH4169返回料合金熔体中的Al_2O_3和TiN,这是返回料合金中氧、氮含量降低的主要原因。Twelve kinds of compound salts were selected to purify GH4169 returned alloy. Effects of compound salt purifiers on composition and microstructure of returned alloy were studied. Composition, oxygen and nitrogen level; morphology and size of inclusions of purified returned alloy were tested and characterized by different methods. The results indicate that the best compound salts purifiers, 80%B2O3 ＋ 20 % Na2 B4 O7 and 50 % CaF2 ＋ 45 % AlF3 ＋ 5 % CaO ＋ trace amounts of （Al2O3 ＋ MgO）, can obviously drop oxygen and nitrogen level of returned alloy, while content of main elements remains more or less constant. The oxygen level drops by 82.10% and 96.21% respectively, and nitrogen content drops by 69.10% and 14.55% respectively. Absorption and removal of Al2O3 and TiN in returned alloy by compound salts is the main reason to reduce oxygen and nitrogen level.

关 键 词：复合盐 高温合金 返回料 成分 微观组织 

分 类 号：TG146.1[一般工业技术—材料科学与工程]