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材料导报  2019, Vol. 33 Issue (20): 3452-3459    https://doi.org/10.11896/cldb.18080130
  金属及金属基复合材料 |
添加碳和硼改善第三代镍基定向凝固高温合金的显微组织和偏析行为
王晓娟1,2, 刘林1, 赵新宝3, 黄太文1, 杨文超1, 张军1, 傅恒志1
1 西北工业大学凝固技术国家重点实验室,西安 710072
2 西安工程大学理学院,西安 710048
3 浙江大学材料科学与工程学院,杭州 310027
Improvement of Microstructures and Segregation Behavior of the Third Generation Nickel-based Directionally Solidified Superalloys by Carbon and Boron Additions
WANG Xiaojuan1,2, LIU Lin1, ZHAO Xinbao3, HUANG Taiwen1, YANG Wenchao1, ZHANG Jun1, FU Hengzhi1
1 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072
2 School of Science, Xi’an Polytechnic University, Xi’an 710048
3 School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027
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摘要 采用高速定向凝固法(HRS)制备了含碳(0%~0.130%(质量分数,下同))和硼(0%~0.014%)的高铼(5%)镍基高温合金,利用SEM和EPMA研究了碳和硼含量对合金凝固组织和显微偏析的影响。结果表明:碳和硼的添加对一次枝晶间距无明显影响;但随碳含量的增加,共晶的体积分数和平均尺寸减小,碳化物的体积分数增多;随硼含量的增加,共晶的体积分数和平均尺寸增加,碳化物的体积分数减小。在200 μm/s的抽拉速率下,碳化物的形貌主要以汉字体状为主,随碳含量的增加,汉字体碳化物的平均尺寸增大,汉字体网络分布变得密集;随硼含量的增加,汉字体状碳化物有部分向片状和大片状转化。随碳含量的增加,Re和W凝固偏析呈现先加重后减轻的趋势,其峰值出现在碳含量为0.040%处;随硼含量的增加,Re和W的凝固偏析先稍微减轻然后又加重。碳和硼对Ta的凝固偏析影响不大。
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王晓娟
刘林
赵新宝
黄太文
杨文超
张军
傅恒志
关键词:  镍基高温合金  定向凝固  碳和硼  析出相  偏析    
Abstract: Nickel-based superalloys have been widely used in aircraft and industrial gas turbine. However, the casting characteristics of these modern high-refractory alloys are significantly worse than those of earlier alloys, such as a wider range of crystal orientations, the formation of grain defects, hot tearing and so on. To improve these properties of the alloys, minor elements of carbon (C) and boron (B) additions have been reco-gnized one of effective methods. But unfortunately, few investigations were related with higher generation directionally solidified superalloys containing rhenium (Re) up to now. In this paper, the microstructure and dendritic segregation of Ni-based superalloy containing Re (5wt%) were investigated by directional solidification with withdrawal rates of 200 μm/s. The results showed that the addition of carbon and boron did not remarkably change primary dendrite arm apacing λ1. Carbon and boron additions varied the volume fraction of the γ/γ′ eutectic and the distribution of carbides. The volume fraction of γ/γ′ eutectic was reduced and the amount of carbides increased with increasing carbon content; when boron was added into the alloy, the volume fraction of γ/γ′ eutectic was increased and the volume fraction of carbides decreased. The morphology of carbides was mainly Chinese script-type. The average size of carbides became smaller and their distribution was sparse at lower carbon content. However, these carbides were much bigger and their distribution was denser at higher carbon content. The morphology of Chinese script-type carbides changed from a rod to a part sheet, then again to a larger sheet with the increase of boron content. The rise of segregation coefficients of Re and W was followed by the fall with the increase of carbon content, the peak value of segregation coefficient was found at 0.040wt% carbon content. The effect of boron on segregation was just opposite of carbon. For the element of Ta, there was not significant tendency of segregation variation with the increase of carbon and boron contents.
Key words:  nickel-based superalloy    directional solidification    carbon and boron    separating phase    segregation
               出版日期:  2019-10-25      发布日期:  2019-08-29
ZTFLH:  TG113.12  
基金资助: 国家重点研究和发展计划(2016YFB0701400);国家自然科学基金(51331005;51631008;51690160;51501152);陕西省自然科学基 金(2016JQ5093);航空科学基金(2015ZE53059)
作者简介:  王晓娟,于2002年7月和2007年6月分别获得陕西师范大学的理学学士学位和工学硕士学位。从2002年7月至今,工作于西安工程大学。现在西北工业大学攻读博士学位,主要从事定向凝固高温合金微观组织和力学性能的研究。刘林,西北工业大学材料学院教授、博士研究生导师。于1988年12月在西北工业大学取得工学博士学位,1990年获德国著名亚历山大·冯·洪堡奖学金,于1991—1992年在德国柏林工业大学和马克斯·普朗克金属学研究所从事客座研究,1993年起在西北工业大学应用物理系担任教授、系副主任,1995年被评为博士研究生导师,1996—2001年担任西北工业大学科技处处长、校学术委员会秘书长,2002年以后在西北工业大学材料学院任教授、博士研究生导师。长期从事航空发动机用高温金属材料以及金属凝固理论和技术等方面的研究,以第一或通讯作者身份在Scripta MaterialiaJournal of Materials Science & TechnologySuperalloysJournal of Alloys and CompoundsAdvanced Engineering MaterialsMaterials letters等SCI学术期刊发表研究论文200余篇。主持国家863、国家973、国家自然科学基金、国家重大科技专项等项目20余项。获国家发明奖一项、省部级科学技术奖6项,获得专利13项,合作出版了《先进材料定向凝固》《航空航天材料定向凝固》等学术著作。linliu@nwpu.edu.cn
引用本文:    
王晓娟, 刘林, 赵新宝, 黄太文, 杨文超, 张军, 傅恒志. 添加碳和硼改善第三代镍基定向凝固高温合金的显微组织和偏析行为[J]. 材料导报, 2019, 33(20): 3452-3459.
WANG Xiaojuan, LIU Lin, ZHAO Xinbao, HUANG Taiwen, YANG Wenchao, ZHANG Jun, FU Hengzhi. Improvement of Microstructures and Segregation Behavior of the Third Generation Nickel-based Directionally Solidified Superalloys by Carbon and Boron Additions. Materials Reports, 2019, 33(20): 3452-3459.
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http://www.mater-rep.com/CN/10.11896/cldb.18080130  或          http://www.mater-rep.com/CN/Y2019/V33/I20/3452
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