第36卷第6期 北京科技大学学报 Vol.36 No.6 2014年6月 Journal of University of Science and Technology Beijing Jun.2014 700℃超超临界锅炉材料617B合金铸态组织及均匀 化工艺 江河四，董建新，张麦仓，姚志浩 北京科技大学材料科学与工程学院，北京100083 ☒通信作者，E-mail:jianghel7@sina.cn 摘要利用光学显微镜、扫描电镜和能谱分析对采用真空感应熔炼和保护气氛电渣重熔双联工艺生产的617B合金电渣锭 进行组织分析、析出相和元素偏析情况研究.依据残余偏析指数模型通过Dit热力学软件计算提出七种不同的均匀化制 度，并结合均匀化后的组织分析和热模拟压缩试验，确定了617B合金的最终均匀化制度.结果表明：经双联工艺生产的617B 合金电渣锭中存在枝晶和元素偏析，其中Mo和T是主要的偏析元素：电渣锭组织的晶内存在较多的块状碳化物，表现为多种 碳化物共生生长.经过1210℃保温48h均匀化处理后，枝晶和元素偏析基本消除，晶内的块状碳化物部分溶解，且均匀化后 的合金表现出良好的塑性. 关键词高温合金；镍合金；显微结构：均匀化：偏析 分类号TG146.15 Microstructure and homogenization of as-cast 617B alloy for 700 C ultra-supercritical boilers JIANG He,DONG Jian-xin,ZHANG Mai-eang,YAO Zhi-hao School of Material Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:jianghel7@sina.cn ABSTRACT The microstructure and microsegregation of nickel-based superalloy Inconel 617B ingots produced by vacuum induction melting and electroslag remelting were studied by optical microscopy,scanning electron microscopy,and energy dispersive X-ray spec- troscopy.Their kinetic homogenization curves were calculated by Dictra software through the residual segregation parameter model. Based on the theoretical results,seven homogenizing treatments were tested.Microstructure analysis and thermal compression test with a Gleeble 1500 machine were used to verify the effect of homogenizing treatment.It is found that dendrites and element segregation ex- ist in the ingots,and Mo and Ti are the principal segregated elements.The main precipitated phases in the ingots are different kinds of primary carbides which tend to symbiotic growth.After homogenization at 1210C for 48h,this segregation can almost be eliminated, the phase of intragranular carbides dissolves to the matrix,and the ingots exhibit excellent workability KEY WORDS superalloys:nickel alloys;microstructure:homogenization;segregation 随着能源和环境问题日渐严重，提高火力发电 传统的铁素体钢无法满足如此严苛的条件-1.镍 机组热效率，降低CO,排放量的要求日益迫切.部 基高温合金因具有更长的蠕变疲劳周期和更好的耐 分国家已经把21世纪的蒸汽参数目标制定为700℃以 蚀能力，有望取代传统的铁素体不锈钢成为新一代 上，从而使热效率突破50%1-习，新一代的超超临 超超临界电站候选材料d 界电站需在700~720℃/393Pa的条件下服役m, 617B是617合金的硼改进型，是发展前景较好 收稿日期：201303-22 基金项目：国家高技术研究发展计划资助项目(2012AA03A501) DOI:10.13374/j.issn1001-053x.2014.06.013:http://journals.ustb.edu.cn第 36 卷 第 6 期 2014 年 6 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 No． 6 Jun． 2014 700 ℃超超临界锅炉材料 617B 合金铸态组织及均匀 化工艺 江 河，董建新，张麦仓，姚志浩 北京科技大学材料科学与工程学院，北京 100083  通信作者，E-mail: jianghe17@ sina． cn 摘 要 利用光学显微镜、扫描电镜和能谱分析对采用真空感应熔炼和保护气氛电渣重熔双联工艺生产的 617B 合金电渣锭 进行组织分析、析出相和元素偏析情况研究． 依据残余偏析指数模型通过 Dictra 热力学软件计算提出七种不同的均匀化制 度，并结合均匀化后的组织分析和热模拟压缩试验，确定了 617B 合金的最终均匀化制度． 结果表明: 经双联工艺生产的 617B 合金电渣锭中存在枝晶和元素偏析，其中 Mo 和 Ti 是主要的偏析元素; 电渣锭组织的晶内存在较多的块状碳化物，表现为多种 碳化物共生生长． 经过 1210 ℃保温 48 h 均匀化处理后，枝晶和元素偏析基本消除，晶内的块状碳化物部分溶解，且均匀化后 的合金表现出良好的塑性． 关键词 高温合金; 镍合金; 显微结构; 均匀化; 偏析 分类号 TG146. 1 + 5 Microstructure and homogenization of as-cast 617B alloy for 700 ℃ ultra-supercritical boilers JIANG He  ，DONG Jian-xin，ZHANG Mai-cang，YAO Zhi-hao School of Material Science and Engineering，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: jianghe17@ sina． cn ABSTＲACT The microstructure and microsegregation of nickel-based superalloy Inconel 617B ingots produced by vacuum induction melting and electroslag remelting were studied by optical microscopy，scanning electron microscopy，and energy dispersive X-ray spec￾troscopy． Their kinetic homogenization curves were calculated by Dictra software through the residual segregation parameter model． Based on the theoretical results，seven homogenizing treatments were tested． Microstructure analysis and thermal compression test with a Gleeble 1500 machine were used to verify the effect of homogenizing treatment． It is found that dendrites and element segregation ex￾ist in the ingots，and Mo and Ti are the principal segregated elements． The main precipitated phases in the ingots are different kinds of primary carbides which tend to symbiotic growth． After homogenization at 1210 ℃ for 48 h，this segregation can almost be eliminated， the phase of intragranular carbides dissolves to the matrix，and the ingots exhibit excellent workability． KEY WOＲDS superalloys; nickel alloys; microstructure; homogenization; segregation 收稿日期: 2013--03--22 基金项目: 国家高技术研究发展计划资助项目( 2012AA03A501) DOI: 10． 13374 /j． issn1001--053x． 2014． 06． 013; http: / /journals． ustb． edu． cn 随着能源和环境问题日渐严重，提高火力发电 机组热效率，降低 CO2排放量的要求日益迫切． 部 分国家已经把21 世纪的蒸汽参数目标制定为700 ℃以 上，从而使热效率突破 50%［1 － 3］，新一代的超超临 界电站需在 700 ～ 720 ℃ /393 Pa 的条件下服役［1］， 传统的铁素体钢无法满足如此严苛的条件［4 － 5］． 镍 基高温合金因具有更长的蠕变疲劳周期和更好的耐 蚀能力，有望取代传统的铁素体不锈钢成为新一代 超超临界电站候选材料［1，4］． 617B 是 617 合金的硼改进型，是发展前景较好